/* * yosys -- Yosys Open SYnthesis Suite * * Copyright (C) 2012 Claire Xenia Wolf * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * --- * * The internal logic cell simulation library. * * This Verilog library contains simple simulation models for the internal * logic cells ($_NOT_ , $_AND_ , ...) that are generated by the default technology * mapper (see "techmap.v" in this directory) and expected by the "abc" pass. * */ // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_BUF_ (A, Y) //- //- A buffer. This cell type is always optimized away by the opt_clean pass. //- //- Truth table: A | Y //- ---+--- //- 0 | 0 //- 1 | 1 //- module \$_BUF_ (A, Y); input A; output Y; assign Y = A; endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_NOT_ (A, Y) //- //- An inverter gate. //- //- Truth table: A | Y //- ---+--- //- 0 | 1 //- 1 | 0 //- module \$_NOT_ (A, Y); input A; output Y; assign Y = ~A; endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_AND_ (A, B, Y) //- //- A 2-input AND gate. //- //- Truth table: A B | Y //- -----+--- //- 0 0 | 0 //- 0 1 | 0 //- 1 0 | 0 //- 1 1 | 1 //- module \$_AND_ (A, B, Y); input A, B; output Y; assign Y = A & B; endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_NAND_ (A, B, Y) //- //- A 2-input NAND gate. //- //- Truth table: A B | Y //- -----+--- //- 0 0 | 1 //- 0 1 | 1 //- 1 0 | 1 //- 1 1 | 0 //- module \$_NAND_ (A, B, Y); input A, B; output Y; assign Y = ~(A & B); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_OR_ (A, B, Y) //- //- A 2-input OR gate. //- //- Truth table: A B | Y //- -----+--- //- 0 0 | 0 //- 0 1 | 1 //- 1 0 | 1 //- 1 1 | 1 //- module \$_OR_ (A, B, Y); input A, B; output Y; assign Y = A | B; endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_NOR_ (A, B, Y) //- //- A 2-input NOR gate. //- //- Truth table: A B | Y //- -----+--- //- 0 0 | 1 //- 0 1 | 0 //- 1 0 | 0 //- 1 1 | 0 //- module \$_NOR_ (A, B, Y); input A, B; output Y; assign Y = ~(A | B); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_XOR_ (A, B, Y) //- //- A 2-input XOR gate. //- //- Truth table: A B | Y //- -----+--- //- 0 0 | 0 //- 0 1 | 1 //- 1 0 | 1 //- 1 1 | 0 //- module \$_XOR_ (A, B, Y); input A, B; output Y; assign Y = A ^ B; endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_XNOR_ (A, B, Y) //- //- A 2-input XNOR gate. //- //- Truth table: A B | Y //- -----+--- //- 0 0 | 1 //- 0 1 | 0 //- 1 0 | 0 //- 1 1 | 1 //- module \$_XNOR_ (A, B, Y); input A, B; output Y; assign Y = ~(A ^ B); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_ANDNOT_ (A, B, Y) //- //- A 2-input AND-NOT gate. //- //- Truth table: A B | Y //- -----+--- //- 0 0 | 0 //- 0 1 | 0 //- 1 0 | 1 //- 1 1 | 0 //- module \$_ANDNOT_ (A, B, Y); input A, B; output Y; assign Y = A & (~B); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_ORNOT_ (A, B, Y) //- //- A 2-input OR-NOT gate. //- //- Truth table: A B | Y //- -----+--- //- 0 0 | 1 //- 0 1 | 0 //- 1 0 | 1 //- 1 1 | 1 //- module \$_ORNOT_ (A, B, Y); input A, B; output Y; assign Y = A | (~B); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_MUX_ (A, B, S, Y) //- //- A 2-input MUX gate. //- //- Truth table: A B S | Y //- -------+--- //- a - 0 | a //- - b 1 | b //- module \$_MUX_ (A, B, S, Y); input A, B, S; output Y; assign Y = S ? B : A; endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_NMUX_ (A, B, S, Y) //- //- A 2-input inverting MUX gate. //- //- Truth table: A B S | Y //- -------+--- //- 0 - 0 | 1 //- 1 - 0 | 0 //- - 0 1 | 1 //- - 1 1 | 0 //- module \$_NMUX_ (A, B, S, Y); input A, B, S; output Y; assign Y = S ? !B : !A; endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_MUX4_ (A, B, C, D, S, T, Y) //- //- A 4-input MUX gate. //- //- Truth table: A B C D S T | Y //- -------------+--- //- a - - - 0 0 | a //- - b - - 1 0 | b //- - - c - 0 1 | c //- - - - d 1 1 | d //- module \$_MUX4_ (A, B, C, D, S, T, Y); input A, B, C, D, S, T; output Y; assign Y = T ? (S ? D : C) : (S ? B : A); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_MUX8_ (A, B, C, D, E, F, G, H, S, T, U, Y) //- //- An 8-input MUX gate. //- //- Truth table: A B C D E F G H S T U | Y //- -----------------------+--- //- a - - - - - - - 0 0 0 | a //- - b - - - - - - 1 0 0 | b //- - - c - - - - - 0 1 0 | c //- - - - d - - - - 1 1 0 | d //- - - - - e - - - 0 0 1 | e //- - - - - - f - - 1 0 1 | f //- - - - - - - g - 0 1 1 | g //- - - - - - - - h 1 1 1 | h //- module \$_MUX8_ (A, B, C, D, E, F, G, H, S, T, U, Y); input A, B, C, D, E, F, G, H, S, T, U; output Y; assign Y = U ? T ? (S ? H : G) : (S ? F : E) : T ? (S ? D : C) : (S ? B : A); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_MUX16_ (A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, S, T, U, V, Y) //- //- A 16-input MUX gate. //- //- Truth table: A B C D E F G H I J K L M N O P S T U V | Y //- -----------------------------------------+--- //- a - - - - - - - - - - - - - - - 0 0 0 0 | a //- - b - - - - - - - - - - - - - - 1 0 0 0 | b //- - - c - - - - - - - - - - - - - 0 1 0 0 | c //- - - - d - - - - - - - - - - - - 1 1 0 0 | d //- - - - - e - - - - - - - - - - - 0 0 1 0 | e //- - - - - - f - - - - - - - - - - 1 0 1 0 | f //- - - - - - - g - - - - - - - - - 0 1 1 0 | g //- - - - - - - - h - - - - - - - - 1 1 1 0 | h //- - - - - - - - - i - - - - - - - 0 0 0 1 | i //- - - - - - - - - - j - - - - - - 1 0 0 1 | j //- - - - - - - - - - - k - - - - - 0 1 0 1 | k //- - - - - - - - - - - - l - - - - 1 1 0 1 | l //- - - - - - - - - - - - - m - - - 0 0 1 1 | m //- - - - - - - - - - - - - - n - - 1 0 1 1 | n //- - - - - - - - - - - - - - - o - 0 1 1 1 | o //- - - - - - - - - - - - - - - - p 1 1 1 1 | p //- module \$_MUX16_ (A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, S, T, U, V, Y); input A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, S, T, U, V; output Y; assign Y = V ? U ? T ? (S ? P : O) : (S ? N : M) : T ? (S ? L : K) : (S ? J : I) : U ? T ? (S ? H : G) : (S ? F : E) : T ? (S ? D : C) : (S ? B : A); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_AOI3_ (A, B, C, Y) //- //- A 3-input And-Or-Invert gate. //- //- Truth table: A B C | Y //- -------+--- //- 0 0 0 | 1 //- 0 0 1 | 0 //- 0 1 0 | 1 //- 0 1 1 | 0 //- 1 0 0 | 1 //- 1 0 1 | 0 //- 1 1 0 | 0 //- 1 1 1 | 0 //- module \$_AOI3_ (A, B, C, Y); input A, B, C; output Y; assign Y = ~((A & B) | C); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_OAI3_ (A, B, C, Y) //- //- A 3-input Or-And-Invert gate. //- //- Truth table: A B C | Y //- -------+--- //- 0 0 0 | 1 //- 0 0 1 | 1 //- 0 1 0 | 1 //- 0 1 1 | 0 //- 1 0 0 | 1 //- 1 0 1 | 0 //- 1 1 0 | 1 //- 1 1 1 | 0 //- module \$_OAI3_ (A, B, C, Y); input A, B, C; output Y; assign Y = ~((A | B) & C); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_AOI4_ (A, B, C, Y) //- //- A 4-input And-Or-Invert gate. //- //- Truth table: A B C D | Y //- ---------+--- //- 0 0 0 0 | 1 //- 0 0 0 1 | 1 //- 0 0 1 0 | 1 //- 0 0 1 1 | 0 //- 0 1 0 0 | 1 //- 0 1 0 1 | 1 //- 0 1 1 0 | 1 //- 0 1 1 1 | 0 //- 1 0 0 0 | 1 //- 1 0 0 1 | 1 //- 1 0 1 0 | 1 //- 1 0 1 1 | 0 //- 1 1 0 0 | 0 //- 1 1 0 1 | 0 //- 1 1 1 0 | 0 //- 1 1 1 1 | 0 //- module \$_AOI4_ (A, B, C, D, Y); input A, B, C, D; output Y; assign Y = ~((A & B) | (C & D)); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_OAI4_ (A, B, C, Y) //- //- A 4-input Or-And-Invert gate. //- //- Truth table: A B C D | Y //- ---------+--- //- 0 0 0 0 | 1 //- 0 0 0 1 | 1 //- 0 0 1 0 | 1 //- 0 0 1 1 | 1 //- 0 1 0 0 | 1 //- 0 1 0 1 | 0 //- 0 1 1 0 | 0 //- 0 1 1 1 | 0 //- 1 0 0 0 | 1 //- 1 0 0 1 | 0 //- 1 0 1 0 | 0 //- 1 0 1 1 | 0 //- 1 1 0 0 | 1 //- 1 1 0 1 | 0 //- 1 1 1 0 | 0 //- 1 1 1 1 | 0 //- module \$_OAI4_ (A, B, C, D, Y); input A, B, C, D; output Y; assign Y = ~((A | B) & (C | D)); endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_TBUF_ (A, E, Y) //- //- A tri-state buffer. //- //- Truth table: A E | Y //- -----+--- //- a 1 | a //- - 0 | z //- module \$_TBUF_ (A, E, Y); input A, E; output Y; assign Y = E ? A : 1'bz; endmodule // NOTE: the following cell types are autogenerated. DO NOT EDIT them manually, // instead edit the templates in gen_ff_types.py and rerun it. // START AUTOGENERATED CELL TYPES // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SR_NN_ (S, R, Q) //- //- A set-reset latch with negative polarity SET and negative polarity RESET. //- //- Truth table: S R | Q //- -----+--- //- - 0 | 0 //- 0 - | 1 //- - - | q //- module \$_SR_NN_ (S, R, Q); input S, R; output reg Q; always @* begin if (R == 0) Q <= 0; else if (S == 0) Q <= 1; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SR_NP_ (S, R, Q) //- //- A set-reset latch with negative polarity SET and positive polarity RESET. //- //- Truth table: S R | Q //- -----+--- //- - 1 | 0 //- 0 - | 1 //- - - | q //- module \$_SR_NP_ (S, R, Q); input S, R; output reg Q; always @* begin if (R == 1) Q <= 0; else if (S == 0) Q <= 1; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SR_PN_ (S, R, Q) //- //- A set-reset latch with positive polarity SET and negative polarity RESET. //- //- Truth table: S R | Q //- -----+--- //- - 0 | 0 //- 1 - | 1 //- - - | q //- module \$_SR_PN_ (S, R, Q); input S, R; output reg Q; always @* begin if (R == 0) Q <= 0; else if (S == 1) Q <= 1; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SR_PP_ (S, R, Q) //- //- A set-reset latch with positive polarity SET and positive polarity RESET. //- //- Truth table: S R | Q //- -----+--- //- - 1 | 0 //- 1 - | 1 //- - - | q //- module \$_SR_PP_ (S, R, Q); input S, R; output reg Q; always @* begin if (R == 1) Q <= 0; else if (S == 1) Q <= 1; end endmodule `ifdef SIMCELLS_FF // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_FF_ (D, Q) //- //- A D-type flip-flop that is clocked from the implicit global clock. (This cell //- type is usually only used in netlists for formal verification.) //- module \$_FF_ (D, Q); input D; output reg Q; always @($global_clock) begin Q <= D; end endmodule `endif // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFF_N_ (D, C, Q) //- //- A negative edge D-type flip-flop. //- //- Truth table: D C | Q //- -----+--- //- d \ | d //- - - | q //- module \$_DFF_N_ (D, C, Q); input D, C; output reg Q; always @(negedge C) begin Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFF_P_ (D, C, Q) //- //- A positive edge D-type flip-flop. //- //- Truth table: D C | Q //- -----+--- //- d / | d //- - - | q //- module \$_DFF_P_ (D, C, Q); input D, C; output reg Q; always @(posedge C) begin Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_NN_ (D, C, E, Q) //- //- A negative edge D-type flip-flop with negative polarity enable. //- //- Truth table: D C E | Q //- -------+--- //- d \ 0 | d //- - - - | q //- module \$_DFFE_NN_ (D, C, E, Q); input D, C, E; output reg Q; always @(negedge C) begin if (!E) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_NP_ (D, C, E, Q) //- //- A negative edge D-type flip-flop with positive polarity enable. //- //- Truth table: D C E | Q //- -------+--- //- d \ 1 | d //- - - - | q //- module \$_DFFE_NP_ (D, C, E, Q); input D, C, E; output reg Q; always @(negedge C) begin if (E) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_PN_ (D, C, E, Q) //- //- A positive edge D-type flip-flop with negative polarity enable. //- //- Truth table: D C E | Q //- -------+--- //- d / 0 | d //- - - - | q //- module \$_DFFE_PN_ (D, C, E, Q); input D, C, E; output reg Q; always @(posedge C) begin if (!E) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_PP_ (D, C, E, Q) //- //- A positive edge D-type flip-flop with positive polarity enable. //- //- Truth table: D C E | Q //- -------+--- //- d / 1 | d //- - - - | q //- module \$_DFFE_PP_ (D, C, E, Q); input D, C, E; output reg Q; always @(posedge C) begin if (E) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFF_NN0_ (D, C, R, Q) //- //- A negative edge D-type flip-flop with negative polarity reset. //- //- Truth table: D C R | Q //- -------+--- //- - - 0 | 0 //- d \ - | d //- - - - | q //- module \$_DFF_NN0_ (D, C, R, Q); input D, C, R; output reg Q; always @(negedge C or negedge R) begin if (R == 0) Q <= 0; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFF_NN1_ (D, C, R, Q) //- //- A negative edge D-type flip-flop with negative polarity set. //- //- Truth table: D C R | Q //- -------+--- //- - - 0 | 1 //- d \ - | d //- - - - | q //- module \$_DFF_NN1_ (D, C, R, Q); input D, C, R; output reg Q; always @(negedge C or negedge R) begin if (R == 0) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFF_NP0_ (D, C, R, Q) //- //- A negative edge D-type flip-flop with positive polarity reset. //- //- Truth table: D C R | Q //- -------+--- //- - - 1 | 0 //- d \ - | d //- - - - | q //- module \$_DFF_NP0_ (D, C, R, Q); input D, C, R; output reg Q; always @(negedge C or posedge R) begin if (R == 1) Q <= 0; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFF_NP1_ (D, C, R, Q) //- //- A negative edge D-type flip-flop with positive polarity set. //- //- Truth table: D C R | Q //- -------+--- //- - - 1 | 1 //- d \ - | d //- - - - | q //- module \$_DFF_NP1_ (D, C, R, Q); input D, C, R; output reg Q; always @(negedge C or posedge R) begin if (R == 1) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFF_PN0_ (D, C, R, Q) //- //- A positive edge D-type flip-flop with negative polarity reset. //- //- Truth table: D C R | Q //- -------+--- //- - - 0 | 0 //- d / - | d //- - - - | q //- module \$_DFF_PN0_ (D, C, R, Q); input D, C, R; output reg Q; always @(posedge C or negedge R) begin if (R == 0) Q <= 0; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFF_PN1_ (D, C, R, Q) //- //- A positive edge D-type flip-flop with negative polarity set. //- //- Truth table: D C R | Q //- -------+--- //- - - 0 | 1 //- d / - | d //- - - - | q //- module \$_DFF_PN1_ (D, C, R, Q); input D, C, R; output reg Q; always @(posedge C or negedge R) begin if (R == 0) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFF_PP0_ (D, C, R, Q) //- //- A positive edge D-type flip-flop with positive polarity reset. //- //- Truth table: D C R | Q //- -------+--- //- - - 1 | 0 //- d / - | d //- - - - | q //- module \$_DFF_PP0_ (D, C, R, Q); input D, C, R; output reg Q; always @(posedge C or posedge R) begin if (R == 1) Q <= 0; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFF_PP1_ (D, C, R, Q) //- //- A positive edge D-type flip-flop with positive polarity set. //- //- Truth table: D C R | Q //- -------+--- //- - - 1 | 1 //- d / - | d //- - - - | q //- module \$_DFF_PP1_ (D, C, R, Q); input D, C, R; output reg Q; always @(posedge C or posedge R) begin if (R == 1) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_NN0N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity reset and negative //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 0 - | 0 //- d \ - 0 | d //- - - - - | q //- module \$_DFFE_NN0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C or negedge R) begin if (R == 0) Q <= 0; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_NN0P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity reset and positive //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 0 - | 0 //- d \ - 1 | d //- - - - - | q //- module \$_DFFE_NN0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C or negedge R) begin if (R == 0) Q <= 0; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_NN1N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity set and negative //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 0 - | 1 //- d \ - 0 | d //- - - - - | q //- module \$_DFFE_NN1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C or negedge R) begin if (R == 0) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_NN1P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity set and positive //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 0 - | 1 //- d \ - 1 | d //- - - - - | q //- module \$_DFFE_NN1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C or negedge R) begin if (R == 0) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_NP0N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity reset and negative //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 1 - | 0 //- d \ - 0 | d //- - - - - | q //- module \$_DFFE_NP0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C or posedge R) begin if (R == 1) Q <= 0; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_NP0P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity reset and positive //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 1 - | 0 //- d \ - 1 | d //- - - - - | q //- module \$_DFFE_NP0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C or posedge R) begin if (R == 1) Q <= 0; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_NP1N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity set and negative //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 1 - | 1 //- d \ - 0 | d //- - - - - | q //- module \$_DFFE_NP1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C or posedge R) begin if (R == 1) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_NP1P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity set and positive //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 1 - | 1 //- d \ - 1 | d //- - - - - | q //- module \$_DFFE_NP1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C or posedge R) begin if (R == 1) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_PN0N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity reset and negative //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 0 - | 0 //- d / - 0 | d //- - - - - | q //- module \$_DFFE_PN0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C or negedge R) begin if (R == 0) Q <= 0; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_PN0P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity reset and positive //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 0 - | 0 //- d / - 1 | d //- - - - - | q //- module \$_DFFE_PN0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C or negedge R) begin if (R == 0) Q <= 0; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_PN1N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity set and negative //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 0 - | 1 //- d / - 0 | d //- - - - - | q //- module \$_DFFE_PN1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C or negedge R) begin if (R == 0) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_PN1P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity set and positive //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 0 - | 1 //- d / - 1 | d //- - - - - | q //- module \$_DFFE_PN1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C or negedge R) begin if (R == 0) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_PP0N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity reset and negative //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 1 - | 0 //- d / - 0 | d //- - - - - | q //- module \$_DFFE_PP0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C or posedge R) begin if (R == 1) Q <= 0; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_PP0P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity reset and positive //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 1 - | 0 //- d / - 1 | d //- - - - - | q //- module \$_DFFE_PP0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C or posedge R) begin if (R == 1) Q <= 0; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_PP1N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity set and negative //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 1 - | 1 //- d / - 0 | d //- - - - - | q //- module \$_DFFE_PP1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C or posedge R) begin if (R == 1) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFE_PP1P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity set and positive //- polarity clock enable. //- //- Truth table: D C R E | Q //- ---------+--- //- - - 1 - | 1 //- d / - 1 | d //- - - - - | q //- module \$_DFFE_PP1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C or posedge R) begin if (R == 1) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSR_NNN_ (C, S, R, D, Q) //- //- A negative edge D-type flip-flop with negative polarity set and negative //- polarity reset. //- //- Truth table: C S R D | Q //- ---------+--- //- - - 0 - | 0 //- - 0 - - | 1 //- \ - - d | d //- - - - - | q //- module \$_DFFSR_NNN_ (C, S, R, D, Q); input C, S, R, D; output reg Q; always @(negedge C, negedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 0) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSR_NNP_ (C, S, R, D, Q) //- //- A negative edge D-type flip-flop with negative polarity set and positive //- polarity reset. //- //- Truth table: C S R D | Q //- ---------+--- //- - - 1 - | 0 //- - 0 - - | 1 //- \ - - d | d //- - - - - | q //- module \$_DFFSR_NNP_ (C, S, R, D, Q); input C, S, R, D; output reg Q; always @(negedge C, negedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 0) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSR_NPN_ (C, S, R, D, Q) //- //- A negative edge D-type flip-flop with positive polarity set and negative //- polarity reset. //- //- Truth table: C S R D | Q //- ---------+--- //- - - 0 - | 0 //- - 1 - - | 1 //- \ - - d | d //- - - - - | q //- module \$_DFFSR_NPN_ (C, S, R, D, Q); input C, S, R, D; output reg Q; always @(negedge C, posedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 1) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSR_NPP_ (C, S, R, D, Q) //- //- A negative edge D-type flip-flop with positive polarity set and positive //- polarity reset. //- //- Truth table: C S R D | Q //- ---------+--- //- - - 1 - | 0 //- - 1 - - | 1 //- \ - - d | d //- - - - - | q //- module \$_DFFSR_NPP_ (C, S, R, D, Q); input C, S, R, D; output reg Q; always @(negedge C, posedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 1) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSR_PNN_ (C, S, R, D, Q) //- //- A positive edge D-type flip-flop with negative polarity set and negative //- polarity reset. //- //- Truth table: C S R D | Q //- ---------+--- //- - - 0 - | 0 //- - 0 - - | 1 //- / - - d | d //- - - - - | q //- module \$_DFFSR_PNN_ (C, S, R, D, Q); input C, S, R, D; output reg Q; always @(posedge C, negedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 0) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSR_PNP_ (C, S, R, D, Q) //- //- A positive edge D-type flip-flop with negative polarity set and positive //- polarity reset. //- //- Truth table: C S R D | Q //- ---------+--- //- - - 1 - | 0 //- - 0 - - | 1 //- / - - d | d //- - - - - | q //- module \$_DFFSR_PNP_ (C, S, R, D, Q); input C, S, R, D; output reg Q; always @(posedge C, negedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 0) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSR_PPN_ (C, S, R, D, Q) //- //- A positive edge D-type flip-flop with positive polarity set and negative //- polarity reset. //- //- Truth table: C S R D | Q //- ---------+--- //- - - 0 - | 0 //- - 1 - - | 1 //- / - - d | d //- - - - - | q //- module \$_DFFSR_PPN_ (C, S, R, D, Q); input C, S, R, D; output reg Q; always @(posedge C, posedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 1) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSR_PPP_ (C, S, R, D, Q) //- //- A positive edge D-type flip-flop with positive polarity set and positive //- polarity reset. //- //- Truth table: C S R D | Q //- ---------+--- //- - - 1 - | 0 //- - 1 - - | 1 //- / - - d | d //- - - - - | q //- module \$_DFFSR_PPP_ (C, S, R, D, Q); input C, S, R, D; output reg Q; always @(posedge C, posedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 1) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_NNNN_ (C, S, R, E, D, Q) //- //- A negative edge D-type flip-flop with negative polarity set, negative //- polarity reset and negative polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 0 - - | 0 //- - 0 - - - | 1 //- \ - - 0 d | d //- - - - - - | q //- module \$_DFFSRE_NNNN_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(negedge C, negedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 0) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_NNNP_ (C, S, R, E, D, Q) //- //- A negative edge D-type flip-flop with negative polarity set, negative //- polarity reset and positive polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 0 - - | 0 //- - 0 - - - | 1 //- \ - - 1 d | d //- - - - - - | q //- module \$_DFFSRE_NNNP_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(negedge C, negedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 0) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_NNPN_ (C, S, R, E, D, Q) //- //- A negative edge D-type flip-flop with negative polarity set, positive //- polarity reset and negative polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 1 - - | 0 //- - 0 - - - | 1 //- \ - - 0 d | d //- - - - - - | q //- module \$_DFFSRE_NNPN_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(negedge C, negedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 0) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_NNPP_ (C, S, R, E, D, Q) //- //- A negative edge D-type flip-flop with negative polarity set, positive //- polarity reset and positive polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 1 - - | 0 //- - 0 - - - | 1 //- \ - - 1 d | d //- - - - - - | q //- module \$_DFFSRE_NNPP_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(negedge C, negedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 0) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_NPNN_ (C, S, R, E, D, Q) //- //- A negative edge D-type flip-flop with positive polarity set, negative //- polarity reset and negative polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 0 - - | 0 //- - 1 - - - | 1 //- \ - - 0 d | d //- - - - - - | q //- module \$_DFFSRE_NPNN_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(negedge C, posedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 1) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_NPNP_ (C, S, R, E, D, Q) //- //- A negative edge D-type flip-flop with positive polarity set, negative //- polarity reset and positive polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 0 - - | 0 //- - 1 - - - | 1 //- \ - - 1 d | d //- - - - - - | q //- module \$_DFFSRE_NPNP_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(negedge C, posedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 1) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_NPPN_ (C, S, R, E, D, Q) //- //- A negative edge D-type flip-flop with positive polarity set, positive //- polarity reset and negative polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 1 - - | 0 //- - 1 - - - | 1 //- \ - - 0 d | d //- - - - - - | q //- module \$_DFFSRE_NPPN_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(negedge C, posedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 1) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_NPPP_ (C, S, R, E, D, Q) //- //- A negative edge D-type flip-flop with positive polarity set, positive //- polarity reset and positive polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 1 - - | 0 //- - 1 - - - | 1 //- \ - - 1 d | d //- - - - - - | q //- module \$_DFFSRE_NPPP_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(negedge C, posedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 1) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_PNNN_ (C, S, R, E, D, Q) //- //- A positive edge D-type flip-flop with negative polarity set, negative //- polarity reset and negative polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 0 - - | 0 //- - 0 - - - | 1 //- / - - 0 d | d //- - - - - - | q //- module \$_DFFSRE_PNNN_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(posedge C, negedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 0) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_PNNP_ (C, S, R, E, D, Q) //- //- A positive edge D-type flip-flop with negative polarity set, negative //- polarity reset and positive polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 0 - - | 0 //- - 0 - - - | 1 //- / - - 1 d | d //- - - - - - | q //- module \$_DFFSRE_PNNP_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(posedge C, negedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 0) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_PNPN_ (C, S, R, E, D, Q) //- //- A positive edge D-type flip-flop with negative polarity set, positive //- polarity reset and negative polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 1 - - | 0 //- - 0 - - - | 1 //- / - - 0 d | d //- - - - - - | q //- module \$_DFFSRE_PNPN_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(posedge C, negedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 0) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_PNPP_ (C, S, R, E, D, Q) //- //- A positive edge D-type flip-flop with negative polarity set, positive //- polarity reset and positive polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 1 - - | 0 //- - 0 - - - | 1 //- / - - 1 d | d //- - - - - - | q //- module \$_DFFSRE_PNPP_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(posedge C, negedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 0) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_PPNN_ (C, S, R, E, D, Q) //- //- A positive edge D-type flip-flop with positive polarity set, negative //- polarity reset and negative polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 0 - - | 0 //- - 1 - - - | 1 //- / - - 0 d | d //- - - - - - | q //- module \$_DFFSRE_PPNN_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(posedge C, posedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 1) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_PPNP_ (C, S, R, E, D, Q) //- //- A positive edge D-type flip-flop with positive polarity set, negative //- polarity reset and positive polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 0 - - | 0 //- - 1 - - - | 1 //- / - - 1 d | d //- - - - - - | q //- module \$_DFFSRE_PPNP_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(posedge C, posedge S, negedge R) begin if (R == 0) Q <= 0; else if (S == 1) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_PPPN_ (C, S, R, E, D, Q) //- //- A positive edge D-type flip-flop with positive polarity set, positive //- polarity reset and negative polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 1 - - | 0 //- - 1 - - - | 1 //- / - - 0 d | d //- - - - - - | q //- module \$_DFFSRE_PPPN_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(posedge C, posedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 1) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DFFSRE_PPPP_ (C, S, R, E, D, Q) //- //- A positive edge D-type flip-flop with positive polarity set, positive //- polarity reset and positive polarity clock enable. //- //- Truth table: C S R E D | Q //- -----------+--- //- - - 1 - - | 0 //- - 1 - - - | 1 //- / - - 1 d | d //- - - - - - | q //- module \$_DFFSRE_PPPP_ (C, S, R, E, D, Q); input C, S, R, E, D; output reg Q; always @(posedge C, posedge S, posedge R) begin if (R == 1) Q <= 0; else if (S == 1) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFF_NN0_ (D, C, R, Q) //- //- A negative edge D-type flip-flop with negative polarity synchronous reset. //- //- Truth table: D C R | Q //- -------+--- //- - \ 0 | 0 //- d \ - | d //- - - - | q //- module \$_SDFF_NN0_ (D, C, R, Q); input D, C, R; output reg Q; always @(negedge C) begin if (R == 0) Q <= 0; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFF_NN1_ (D, C, R, Q) //- //- A negative edge D-type flip-flop with negative polarity synchronous set. //- //- Truth table: D C R | Q //- -------+--- //- - \ 0 | 1 //- d \ - | d //- - - - | q //- module \$_SDFF_NN1_ (D, C, R, Q); input D, C, R; output reg Q; always @(negedge C) begin if (R == 0) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFF_NP0_ (D, C, R, Q) //- //- A negative edge D-type flip-flop with positive polarity synchronous reset. //- //- Truth table: D C R | Q //- -------+--- //- - \ 1 | 0 //- d \ - | d //- - - - | q //- module \$_SDFF_NP0_ (D, C, R, Q); input D, C, R; output reg Q; always @(negedge C) begin if (R == 1) Q <= 0; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFF_NP1_ (D, C, R, Q) //- //- A negative edge D-type flip-flop with positive polarity synchronous set. //- //- Truth table: D C R | Q //- -------+--- //- - \ 1 | 1 //- d \ - | d //- - - - | q //- module \$_SDFF_NP1_ (D, C, R, Q); input D, C, R; output reg Q; always @(negedge C) begin if (R == 1) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFF_PN0_ (D, C, R, Q) //- //- A positive edge D-type flip-flop with negative polarity synchronous reset. //- //- Truth table: D C R | Q //- -------+--- //- - / 0 | 0 //- d / - | d //- - - - | q //- module \$_SDFF_PN0_ (D, C, R, Q); input D, C, R; output reg Q; always @(posedge C) begin if (R == 0) Q <= 0; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFF_PN1_ (D, C, R, Q) //- //- A positive edge D-type flip-flop with negative polarity synchronous set. //- //- Truth table: D C R | Q //- -------+--- //- - / 0 | 1 //- d / - | d //- - - - | q //- module \$_SDFF_PN1_ (D, C, R, Q); input D, C, R; output reg Q; always @(posedge C) begin if (R == 0) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFF_PP0_ (D, C, R, Q) //- //- A positive edge D-type flip-flop with positive polarity synchronous reset. //- //- Truth table: D C R | Q //- -------+--- //- - / 1 | 0 //- d / - | d //- - - - | q //- module \$_SDFF_PP0_ (D, C, R, Q); input D, C, R; output reg Q; always @(posedge C) begin if (R == 1) Q <= 0; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFF_PP1_ (D, C, R, Q) //- //- A positive edge D-type flip-flop with positive polarity synchronous set. //- //- Truth table: D C R | Q //- -------+--- //- - / 1 | 1 //- d / - | d //- - - - | q //- module \$_SDFF_PP1_ (D, C, R, Q); input D, C, R; output reg Q; always @(posedge C) begin if (R == 1) Q <= 1; else Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_NN0N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity synchronous reset and negative //- polarity clock enable (with reset having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 0 - | 0 //- d \ - 0 | d //- - - - - | q //- module \$_SDFFE_NN0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (R == 0) Q <= 0; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_NN0P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity synchronous reset and positive //- polarity clock enable (with reset having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 0 - | 0 //- d \ - 1 | d //- - - - - | q //- module \$_SDFFE_NN0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (R == 0) Q <= 0; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_NN1N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity synchronous set and negative //- polarity clock enable (with set having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 0 - | 1 //- d \ - 0 | d //- - - - - | q //- module \$_SDFFE_NN1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (R == 0) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_NN1P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity synchronous set and positive //- polarity clock enable (with set having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 0 - | 1 //- d \ - 1 | d //- - - - - | q //- module \$_SDFFE_NN1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (R == 0) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_NP0N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity synchronous reset and negative //- polarity clock enable (with reset having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 1 - | 0 //- d \ - 0 | d //- - - - - | q //- module \$_SDFFE_NP0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (R == 1) Q <= 0; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_NP0P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity synchronous reset and positive //- polarity clock enable (with reset having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 1 - | 0 //- d \ - 1 | d //- - - - - | q //- module \$_SDFFE_NP0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (R == 1) Q <= 0; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_NP1N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity synchronous set and negative //- polarity clock enable (with set having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 1 - | 1 //- d \ - 0 | d //- - - - - | q //- module \$_SDFFE_NP1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (R == 1) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_NP1P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity synchronous set and positive //- polarity clock enable (with set having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 1 - | 1 //- d \ - 1 | d //- - - - - | q //- module \$_SDFFE_NP1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (R == 1) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_PN0N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity synchronous reset and negative //- polarity clock enable (with reset having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 0 - | 0 //- d / - 0 | d //- - - - - | q //- module \$_SDFFE_PN0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (R == 0) Q <= 0; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_PN0P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity synchronous reset and positive //- polarity clock enable (with reset having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 0 - | 0 //- d / - 1 | d //- - - - - | q //- module \$_SDFFE_PN0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (R == 0) Q <= 0; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_PN1N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity synchronous set and negative //- polarity clock enable (with set having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 0 - | 1 //- d / - 0 | d //- - - - - | q //- module \$_SDFFE_PN1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (R == 0) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_PN1P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity synchronous set and positive //- polarity clock enable (with set having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 0 - | 1 //- d / - 1 | d //- - - - - | q //- module \$_SDFFE_PN1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (R == 0) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_PP0N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity synchronous reset and negative //- polarity clock enable (with reset having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 1 - | 0 //- d / - 0 | d //- - - - - | q //- module \$_SDFFE_PP0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (R == 1) Q <= 0; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_PP0P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity synchronous reset and positive //- polarity clock enable (with reset having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 1 - | 0 //- d / - 1 | d //- - - - - | q //- module \$_SDFFE_PP0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (R == 1) Q <= 0; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_PP1N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity synchronous set and negative //- polarity clock enable (with set having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 1 - | 1 //- d / - 0 | d //- - - - - | q //- module \$_SDFFE_PP1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (R == 1) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFE_PP1P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity synchronous set and positive //- polarity clock enable (with set having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 1 - | 1 //- d / - 1 | d //- - - - - | q //- module \$_SDFFE_PP1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (R == 1) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_NN0N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity synchronous reset and negative //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 0 0 | 0 //- d \ - 0 | d //- - - - - | q //- module \$_SDFFCE_NN0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (E == 0) begin if (R == 0) Q <= 0; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_NN0P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity synchronous reset and positive //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 0 1 | 0 //- d \ - 1 | d //- - - - - | q //- module \$_SDFFCE_NN0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (E == 1) begin if (R == 0) Q <= 0; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_NN1N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity synchronous set and negative //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 0 0 | 1 //- d \ - 0 | d //- - - - - | q //- module \$_SDFFCE_NN1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (E == 0) begin if (R == 0) Q <= 1; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_NN1P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with negative polarity synchronous set and positive //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 0 1 | 1 //- d \ - 1 | d //- - - - - | q //- module \$_SDFFCE_NN1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (E == 1) begin if (R == 0) Q <= 1; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_NP0N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity synchronous reset and negative //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 1 0 | 0 //- d \ - 0 | d //- - - - - | q //- module \$_SDFFCE_NP0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (E == 0) begin if (R == 1) Q <= 0; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_NP0P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity synchronous reset and positive //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 1 1 | 0 //- d \ - 1 | d //- - - - - | q //- module \$_SDFFCE_NP0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (E == 1) begin if (R == 1) Q <= 0; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_NP1N_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity synchronous set and negative //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 1 0 | 1 //- d \ - 0 | d //- - - - - | q //- module \$_SDFFCE_NP1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (E == 0) begin if (R == 1) Q <= 1; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_NP1P_ (D, C, R, E, Q) //- //- A negative edge D-type flip-flop with positive polarity synchronous set and positive //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - \ 1 1 | 1 //- d \ - 1 | d //- - - - - | q //- module \$_SDFFCE_NP1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(negedge C) begin if (E == 1) begin if (R == 1) Q <= 1; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_PN0N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity synchronous reset and negative //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 0 0 | 0 //- d / - 0 | d //- - - - - | q //- module \$_SDFFCE_PN0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (E == 0) begin if (R == 0) Q <= 0; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_PN0P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity synchronous reset and positive //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 0 1 | 0 //- d / - 1 | d //- - - - - | q //- module \$_SDFFCE_PN0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (E == 1) begin if (R == 0) Q <= 0; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_PN1N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity synchronous set and negative //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 0 0 | 1 //- d / - 0 | d //- - - - - | q //- module \$_SDFFCE_PN1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (E == 0) begin if (R == 0) Q <= 1; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_PN1P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with negative polarity synchronous set and positive //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 0 1 | 1 //- d / - 1 | d //- - - - - | q //- module \$_SDFFCE_PN1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (E == 1) begin if (R == 0) Q <= 1; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_PP0N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity synchronous reset and negative //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 1 0 | 0 //- d / - 0 | d //- - - - - | q //- module \$_SDFFCE_PP0N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (E == 0) begin if (R == 1) Q <= 0; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_PP0P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity synchronous reset and positive //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 1 1 | 0 //- d / - 1 | d //- - - - - | q //- module \$_SDFFCE_PP0P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (E == 1) begin if (R == 1) Q <= 0; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_PP1N_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity synchronous set and negative //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 1 0 | 1 //- d / - 0 | d //- - - - - | q //- module \$_SDFFCE_PP1N_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (E == 0) begin if (R == 1) Q <= 1; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_SDFFCE_PP1P_ (D, C, R, E, Q) //- //- A positive edge D-type flip-flop with positive polarity synchronous set and positive //- polarity clock enable (with clock enable having priority). //- //- Truth table: D C R E | Q //- ---------+--- //- - / 1 1 | 1 //- d / - 1 | d //- - - - - | q //- module \$_SDFFCE_PP1P_ (D, C, R, E, Q); input D, C, R, E; output reg Q; always @(posedge C) begin if (E == 1) begin if (R == 1) Q <= 1; else Q <= D; end end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCH_N_ (E, D, Q) //- //- A negative enable D-type latch. //- //- Truth table: E D | Q //- -----+--- //- 0 d | d //- - - | q //- module \$_DLATCH_N_ (E, D, Q); input E, D; output reg Q; always @* begin if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCH_P_ (E, D, Q) //- //- A positive enable D-type latch. //- //- Truth table: E D | Q //- -----+--- //- 1 d | d //- - - | q //- module \$_DLATCH_P_ (E, D, Q); input E, D; output reg Q; always @* begin if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCH_NN0_ (E, R, D, Q) //- //- A negative enable D-type latch with negative polarity reset. //- //- Truth table: E R D | Q //- -------+--- //- - 0 - | 0 //- 0 - d | d //- - - - | q //- module \$_DLATCH_NN0_ (E, R, D, Q); input E, R, D; output reg Q; always @* begin if (R == 0) Q <= 0; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCH_NN1_ (E, R, D, Q) //- //- A negative enable D-type latch with negative polarity set. //- //- Truth table: E R D | Q //- -------+--- //- - 0 - | 1 //- 0 - d | d //- - - - | q //- module \$_DLATCH_NN1_ (E, R, D, Q); input E, R, D; output reg Q; always @* begin if (R == 0) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCH_NP0_ (E, R, D, Q) //- //- A negative enable D-type latch with positive polarity reset. //- //- Truth table: E R D | Q //- -------+--- //- - 1 - | 0 //- 0 - d | d //- - - - | q //- module \$_DLATCH_NP0_ (E, R, D, Q); input E, R, D; output reg Q; always @* begin if (R == 1) Q <= 0; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCH_NP1_ (E, R, D, Q) //- //- A negative enable D-type latch with positive polarity set. //- //- Truth table: E R D | Q //- -------+--- //- - 1 - | 1 //- 0 - d | d //- - - - | q //- module \$_DLATCH_NP1_ (E, R, D, Q); input E, R, D; output reg Q; always @* begin if (R == 1) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCH_PN0_ (E, R, D, Q) //- //- A positive enable D-type latch with negative polarity reset. //- //- Truth table: E R D | Q //- -------+--- //- - 0 - | 0 //- 1 - d | d //- - - - | q //- module \$_DLATCH_PN0_ (E, R, D, Q); input E, R, D; output reg Q; always @* begin if (R == 0) Q <= 0; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCH_PN1_ (E, R, D, Q) //- //- A positive enable D-type latch with negative polarity set. //- //- Truth table: E R D | Q //- -------+--- //- - 0 - | 1 //- 1 - d | d //- - - - | q //- module \$_DLATCH_PN1_ (E, R, D, Q); input E, R, D; output reg Q; always @* begin if (R == 0) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCH_PP0_ (E, R, D, Q) //- //- A positive enable D-type latch with positive polarity reset. //- //- Truth table: E R D | Q //- -------+--- //- - 1 - | 0 //- 1 - d | d //- - - - | q //- module \$_DLATCH_PP0_ (E, R, D, Q); input E, R, D; output reg Q; always @* begin if (R == 1) Q <= 0; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCH_PP1_ (E, R, D, Q) //- //- A positive enable D-type latch with positive polarity set. //- //- Truth table: E R D | Q //- -------+--- //- - 1 - | 1 //- 1 - d | d //- - - - | q //- module \$_DLATCH_PP1_ (E, R, D, Q); input E, R, D; output reg Q; always @* begin if (R == 1) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCHSR_NNN_ (E, S, R, D, Q) //- //- A negative enable D-type latch with negative polarity set and negative //- polarity reset. //- //- Truth table: E S R D | Q //- ---------+--- //- - - 0 - | 0 //- - 0 - - | 1 //- 0 - - d | d //- - - - - | q //- module \$_DLATCHSR_NNN_ (E, S, R, D, Q); input E, S, R, D; output reg Q; always @* begin if (R == 0) Q <= 0; else if (S == 0) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCHSR_NNP_ (E, S, R, D, Q) //- //- A negative enable D-type latch with negative polarity set and positive //- polarity reset. //- //- Truth table: E S R D | Q //- ---------+--- //- - - 1 - | 0 //- - 0 - - | 1 //- 0 - - d | d //- - - - - | q //- module \$_DLATCHSR_NNP_ (E, S, R, D, Q); input E, S, R, D; output reg Q; always @* begin if (R == 1) Q <= 0; else if (S == 0) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCHSR_NPN_ (E, S, R, D, Q) //- //- A negative enable D-type latch with positive polarity set and negative //- polarity reset. //- //- Truth table: E S R D | Q //- ---------+--- //- - - 0 - | 0 //- - 1 - - | 1 //- 0 - - d | d //- - - - - | q //- module \$_DLATCHSR_NPN_ (E, S, R, D, Q); input E, S, R, D; output reg Q; always @* begin if (R == 0) Q <= 0; else if (S == 1) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCHSR_NPP_ (E, S, R, D, Q) //- //- A negative enable D-type latch with positive polarity set and positive //- polarity reset. //- //- Truth table: E S R D | Q //- ---------+--- //- - - 1 - | 0 //- - 1 - - | 1 //- 0 - - d | d //- - - - - | q //- module \$_DLATCHSR_NPP_ (E, S, R, D, Q); input E, S, R, D; output reg Q; always @* begin if (R == 1) Q <= 0; else if (S == 1) Q <= 1; else if (E == 0) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCHSR_PNN_ (E, S, R, D, Q) //- //- A positive enable D-type latch with negative polarity set and negative //- polarity reset. //- //- Truth table: E S R D | Q //- ---------+--- //- - - 0 - | 0 //- - 0 - - | 1 //- 1 - - d | d //- - - - - | q //- module \$_DLATCHSR_PNN_ (E, S, R, D, Q); input E, S, R, D; output reg Q; always @* begin if (R == 0) Q <= 0; else if (S == 0) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCHSR_PNP_ (E, S, R, D, Q) //- //- A positive enable D-type latch with negative polarity set and positive //- polarity reset. //- //- Truth table: E S R D | Q //- ---------+--- //- - - 1 - | 0 //- - 0 - - | 1 //- 1 - - d | d //- - - - - | q //- module \$_DLATCHSR_PNP_ (E, S, R, D, Q); input E, S, R, D; output reg Q; always @* begin if (R == 1) Q <= 0; else if (S == 0) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCHSR_PPN_ (E, S, R, D, Q) //- //- A positive enable D-type latch with positive polarity set and negative //- polarity reset. //- //- Truth table: E S R D | Q //- ---------+--- //- - - 0 - | 0 //- - 1 - - | 1 //- 1 - - d | d //- - - - - | q //- module \$_DLATCHSR_PPN_ (E, S, R, D, Q); input E, S, R, D; output reg Q; always @* begin if (R == 0) Q <= 0; else if (S == 1) Q <= 1; else if (E == 1) Q <= D; end endmodule // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| //- //- $_DLATCHSR_PPP_ (E, S, R, D, Q) //- //- A positive enable D-type latch with positive polarity set and positive //- polarity reset. //- //- Truth table: E S R D | Q //- ---------+--- //- - - 1 - | 0 //- - 1 - - | 1 //- 1 - - d | d //- - - - - | q //- module \$_DLATCHSR_PPP_ (E, S, R, D, Q); input E, S, R, D; output reg Q; always @* begin if (R == 1) Q <= 0; else if (S == 1) Q <= 1; else if (E == 1) Q <= D; end endmodule