mirror of https://github.com/YosysHQ/yosys.git
34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
|
// ---------------------------------------
|
||
|
|
(* lib_whitebox *)
|
||
|
|
module CCU2D (
|
||
|
|
input CIN,
|
||
|
|
input A0, B0, C0, D0, A1, B1, C1, D1,
|
||
|
|
output S0, S1,
|
||
|
|
output COUT
|
||
|
|
);
|
||
|
|
parameter [15:0] INIT0 = 16'h0000;
|
||
|
|
parameter [15:0] INIT1 = 16'h0000;
|
||
|
|
parameter INJECT1_0 = "YES";
|
||
|
|
parameter INJECT1_1 = "YES";
|
||
|
|
|
||
|
|
// First half
|
||
|
|
wire LUT4_0, LUT2_0;
|
||
|
|
LUT4 #(.INIT(INIT0)) lut4_0(.A(A0), .B(B0), .C(C0), .D(D0), .Z(LUT4_0));
|
||
|
|
LUT2 #(.INIT(~INIT0[15:12])) lut2_0(.A(A0), .B(B0), .Z(LUT2_0));
|
||
|
|
wire gated_cin_0 = (INJECT1_0 == "YES") ? 1'b0 : CIN;
|
||
|
|
assign S0 = LUT4_0 ^ gated_cin_0;
|
||
|
|
|
||
|
|
wire gated_lut2_0 = (INJECT1_0 == "YES") ? 1'b0 : LUT2_0;
|
||
|
|
wire cout_0 = (~LUT4_0 & gated_lut2_0) | (LUT4_0 & CIN);
|
||
|
|
|
||
|
|
// Second half
|
||
|
|
wire LUT4_1, LUT2_1;
|
||
|
|
LUT4 #(.INIT(INIT1)) lut4_1(.A(A1), .B(B1), .C(C1), .D(D1), .Z(LUT4_1));
|
||
|
|
LUT2 #(.INIT(~INIT1[15:12])) lut2_1(.A(A1), .B(B1), .Z(LUT2_1));
|
||
|
|
wire gated_cin_1 = (INJECT1_1 == "YES") ? 1'b0 : cout_0;
|
||
|
|
assign S1 = LUT4_1 ^ gated_cin_1;
|
||
|
|
|
||
|
|
wire gated_lut2_1 = (INJECT1_1 == "YES") ? 1'b0 : LUT2_1;
|
||
|
|
assign COUT = (~LUT4_1 & gated_lut2_1) | (LUT4_1 & cout_0);
|
||
|
|
endmodule
|