376 lines
15 KiB
Verilog
376 lines
15 KiB
Verilog
//-----------------------------------------------------
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// Design Name : frac_mem_32k
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// File Name : frac_mem_32k.v
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// Function : A fracturable BRAM which can operate in 13 modes
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// - Single port RAM 512x64 bit
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// - Single port RAM 1024x32 bit
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// - Single port RAM 2048x16 bit
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// - Single port RAM 4096x8 bit
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// - Single port RAM 8192x4 bit
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// - Single port RAM 16384x2 bit
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// - Single port RAM 32768x1 bit
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// - Dual port RAM 1024x32
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// - Dual port RAM 2048x16 bit
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// - Dual port RAM 4096x8 bit
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// - Dual port RAM 8192x4 bit
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// - Dual port RAM 16384x2 bit
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// - Dual port RAM 32768x1 bit
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// Inspired by the dual port ram Verilog from
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// https://www.intel.com/content/www/us/en/programmable/support/support-resources/design-examples/design-software/vhdl/vhd-true-dual-port-ram-sclk.html
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// Coder : Xifan Tang
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//-----------------------------------------------------
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module frac_mem_32k (
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input [0:14] addr_a,
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input [0:14] addr_b,
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input [0:31] data_a,
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input [0:31] data_b,
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input we_a,
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input we_b,
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output reg [0:31] q_a,
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output reg [0:31] q_b,
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input clk,
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input [0:3] mode);
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reg [0:31] ram_a [0:9];
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reg [0:31] ram_b [0:9];
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always @(posedge clk) begin
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// Operating mode: single port RAM 512 x 64
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if (4'b0000 == mode) begin
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if (we_a) begin
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ram_a[addr_a[0:8]] <= data_a;
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ram_b[addr_a[0:8]] <= data_b;
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q_a <= data_a;
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q_b <= data_b;
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end else begin
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q_a <= ram_a[addr_a[0:8]];
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q_b <= ram_b[addr_a[0:8]];
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end
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// Operating mode: single port RAM 1024 x 32
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end else if (4'b0001 == mode) begin
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if (we_a) begin
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ram_a[addr_a[0:9]] <= data_a;
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end else begin
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q_a <= ram_a[addr_a[0:9]];
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end
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// Operating mode: single port RAM 2048 x 16
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end else if (4'b0010 == mode) begin
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if (we_a) begin
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case (addr_a[10:10])
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1'b0 : ram_a[addr_a[0:9]][0:15] <= data_a[0:15];
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1'b1 : ram_a[addr_a[0:9]][16:31] <= data_a[0:15];
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endcase
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end else begin
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case (addr_a[10:10])
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1'b0 : q_a <= ram_a[addr_a[0:9]][0:15];
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1'b1 : q_a <= ram_a[addr_a[0:9]][16:31];
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endcase
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end
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// Operating mode: single port RAM 4096 x 8
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end else if (4'b0011 == mode) begin
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if (we_a) begin
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case (addr_a[10:11])
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2'b00 : ram_a[addr_a[0:9]][0:7] <= data_a[0:7];
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2'b01 : ram_a[addr_a[0:9]][8:15] <= data_a[0:7];
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2'b10 : ram_a[addr_a[0:9]][16:23] <= data_a[0:7];
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2'b11 : ram_a[addr_a[0:9]][24:31] <= data_a[0:7];
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endcase
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end else begin
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case (addr_a[10:11])
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2'b00 : q_a <= ram_a[addr_a[0:9]][0:7];
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2'b01 : q_a <= ram_a[addr_a[0:9]][8:15];
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2'b10 : q_a <= ram_a[addr_a[0:9]][16:23];
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2'b11 : q_a <= ram_a[addr_a[0:9]][24:31];
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endcase
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end
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// Operating mode: single port RAM 8192 x 4
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end else if (4'b0100 == mode) begin
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if (we_a) begin
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case (addr_a[10:12])
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3'b000 : ram_a[addr_a[0:9]][0:3] <= data_a[0:3];
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3'b001 : ram_a[addr_a[0:9]][4:7] <= data_a[0:3];
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3'b010 : ram_a[addr_a[0:9]][8:11] <= data_a[0:3];
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3'b011 : ram_a[addr_a[0:9]][12:15] <= data_a[0:3];
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3'b100 : ram_a[addr_a[0:9]][16:19] <= data_a[0:3];
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3'b101 : ram_a[addr_a[0:9]][20:23] <= data_a[0:3];
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3'b110 : ram_a[addr_a[0:9]][24:27] <= data_a[0:3];
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3'b111 : ram_a[addr_a[0:9]][28:31] <= data_a[0:3];
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endcase
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end else begin
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case (addr_a[10:12])
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3'b000 : q_a <= ram_a[addr_a[0:9]][0:3];
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3'b001 : q_a <= ram_a[addr_a[0:9]][4:7];
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3'b010 : q_a <= ram_a[addr_a[0:9]][8:11];
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3'b011 : q_a <= ram_a[addr_a[0:9]][12:15];
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3'b100 : q_a <= ram_a[addr_a[0:9]][16:19];
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3'b101 : q_a <= ram_a[addr_a[0:9]][20:23];
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3'b110 : q_a <= ram_a[addr_a[0:9]][24:27];
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3'b111 : q_a <= ram_a[addr_a[0:9]][28:31];
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endcase
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end
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// Operating mode: single port RAM 16384 x 2
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end else if (4'b0101 == mode) begin
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if (we_a) begin
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case (addr_a[10:13])
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4'b0000 : ram_a[addr_a[0:9]][0:1] <= data_a[0:1];
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4'b0001 : ram_a[addr_a[0:9]][2:3] <= data_a[0:1];
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4'b0010 : ram_a[addr_a[0:9]][4:5] <= data_a[0:1];
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4'b0011 : ram_a[addr_a[0:9]][6:7] <= data_a[0:1];
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4'b0100 : ram_a[addr_a[0:9]][8:9] <= data_a[0:1];
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4'b0101 : ram_a[addr_a[0:9]][10:11] <= data_a[0:1];
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4'b0110 : ram_a[addr_a[0:9]][12:13] <= data_a[0:1];
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4'b0111 : ram_a[addr_a[0:9]][14:15] <= data_a[0:1];
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4'b1000 : ram_a[addr_a[0:9]][16:17] <= data_a[0:1];
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4'b1001 : ram_a[addr_a[0:9]][18:19] <= data_a[0:1];
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4'b1010 : ram_a[addr_a[0:9]][20:21] <= data_a[0:1];
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4'b1011 : ram_a[addr_a[0:9]][22:23] <= data_a[0:1];
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4'b1100 : ram_a[addr_a[0:9]][24:25] <= data_a[0:1];
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4'b1101 : ram_a[addr_a[0:9]][26:27] <= data_a[0:1];
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4'b1110 : ram_a[addr_a[0:9]][28:29] <= data_a[0:1];
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4'b1111 : ram_a[addr_a[0:9]][30:31] <= data_a[0:1];
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endcase
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end else begin
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case (addr_a[10:13])
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4'b0000 : q_a <= ram_a[addr_a[0:9]][0:1];
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4'b0001 : q_a <= ram_a[addr_a[0:9]][2:3];
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4'b0010 : q_a <= ram_a[addr_a[0:9]][4:5];
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4'b0011 : q_a <= ram_a[addr_a[0:9]][6:7];
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4'b0100 : q_a <= ram_a[addr_a[0:9]][8:9];
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4'b0101 : q_a <= ram_a[addr_a[0:9]][10:11];
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4'b0110 : q_a <= ram_a[addr_a[0:9]][12:13];
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4'b0111 : q_a <= ram_a[addr_a[0:9]][14:15];
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4'b1000 : q_a <= ram_a[addr_a[0:9]][16:17];
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4'b1001 : q_a <= ram_a[addr_a[0:9]][18:19];
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4'b1010 : q_a <= ram_a[addr_a[0:9]][20:21];
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4'b1011 : q_a <= ram_a[addr_a[0:9]][22:23];
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4'b1100 : q_a <= ram_a[addr_a[0:9]][24:25];
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4'b1101 : q_a <= ram_a[addr_a[0:9]][26:27];
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4'b1110 : q_a <= ram_a[addr_a[0:9]][28:29];
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4'b1111 : q_a <= ram_a[addr_a[0:9]][30:31];
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endcase
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end
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// Operating mode: single port RAM 32768 x 1
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end else if (4'b0110 == mode) begin
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if (we_a) begin
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ram_a[addr_a[0:9]][addr_a[10:14]] <= data_a[0:0];
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end else begin
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q_a <= ram_a[addr_a[0:9]][addr_a[10:14]];
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end
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// Operating mode: dual port RAM 1024 x 32
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end else if (4'b0111 == mode) begin
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if (we_a) begin
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ram_a[addr_a[0:9]] <= data_a;
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q_a <= data_a;
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end else begin
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q_a <= ram_a[addr_a[0:9]];
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end
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if (we_b) begin
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ram_b[addr_b[0:9]] <= data_b;
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q_b <= data_b;
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end else begin
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q_b <= ram_b[addr_b[0:9]];
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end
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// Operating mode: dual port RAM 2048 x 16
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end else if (4'b1000 == mode) begin
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if (we_a) begin
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case (addr_a[10:10])
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1'b0 : ram_a[addr_a[0:9]][0:15] <= data_a;
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1'b1 : ram_a[addr_a[0:9]][16:31] <= data_a;
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endcase
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end else begin
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case (addr_a[10:10])
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1'b0 : q_a <= ram_a[addr_a[0:9]][0:15];
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1'b1 : q_a <= ram_a[addr_a[0:9]][16:31];
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endcase
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end
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if (we_b) begin
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case (addr_b[10:10])
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1'b0 : ram_b[addr_b[0:9]][0:15] <= data_b;
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1'b1 : ram_b[addr_b[0:9]][16:31] <= data_b;
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endcase
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end else begin
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case (addr_b[10:10])
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1'b0 : q_b <= ram_b[addr_b[0:9]][0:15];
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1'b1 : q_b <= ram_b[addr_b[0:9]][16:31];
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endcase
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end
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// Operating mode: dual port RAM 4096 x 8
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end else if (4'b1001 == mode) begin
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if (we_a) begin
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case (addr_a[10:11])
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2'b00 : ram_a[addr_a[0:9]][0:7] <= data_a[0:7];
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2'b01 : ram_a[addr_a[0:9]][8:15] <= data_a[0:7];
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2'b10 : ram_a[addr_a[0:9]][16:23] <= data_a[0:7];
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2'b11 : ram_a[addr_a[0:9]][24:31] <= data_a[0:7];
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endcase
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end else begin
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case (addr_a[10:11])
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2'b00 : q_a <= ram_a[addr_a[0:9]][0:7];
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2'b01 : q_a <= ram_a[addr_a[0:9]][8:15];
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2'b10 : q_a <= ram_a[addr_a[0:9]][16:23];
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2'b11 : q_a <= ram_a[addr_a[0:9]][24:31];
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endcase
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end
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if (we_b) begin
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case (addr_b[10:11])
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2'b00 : ram_b[addr_b[0:9]][0:7] <= data_b[0:7];
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2'b01 : ram_b[addr_b[0:9]][8:15] <= data_b[0:7];
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2'b10 : ram_b[addr_b[0:9]][16:23] <= data_b[0:7];
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2'b11 : ram_b[addr_b[0:9]][24:31] <= data_b[0:7];
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endcase
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end else begin
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case (addr_b[10:11])
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2'b00 : q_b <= ram_b[addr_b[0:9]][0:7];
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2'b01 : q_b <= ram_b[addr_b[0:9]][8:15];
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2'b10 : q_b <= ram_b[addr_b[0:9]][16:23];
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2'b11 : q_b <= ram_b[addr_b[0:9]][24:31];
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endcase
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end
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// Operating mode: dual port RAM 8192 x 4
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end else if (4'b1011 == mode) begin
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if (we_a) begin
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case (addr_a[10:12])
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3'b000 : ram_a[addr_a[0:9]][0:3] <= data_a[0:3];
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3'b001 : ram_a[addr_a[0:9]][4:7] <= data_a[0:3];
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3'b010 : ram_a[addr_a[0:9]][8:11] <= data_a[0:3];
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3'b011 : ram_a[addr_a[0:9]][12:15] <= data_a[0:3];
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3'b100 : ram_a[addr_a[0:9]][16:19] <= data_a[0:3];
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3'b101 : ram_a[addr_a[0:9]][20:23] <= data_a[0:3];
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3'b110 : ram_a[addr_a[0:9]][24:27] <= data_a[0:3];
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3'b111 : ram_a[addr_a[0:9]][28:31] <= data_a[0:3];
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endcase
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end else begin
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case (addr_a[10:12])
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3'b000 : q_a <= ram_a[addr_a[0:9]][0:3];
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3'b001 : q_a <= ram_a[addr_a[0:9]][4:7];
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3'b010 : q_a <= ram_a[addr_a[0:9]][8:11];
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3'b011 : q_a <= ram_a[addr_a[0:9]][12:15];
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3'b100 : q_a <= ram_a[addr_a[0:9]][16:19];
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3'b101 : q_a <= ram_a[addr_a[0:9]][20:23];
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3'b110 : q_a <= ram_a[addr_a[0:9]][24:27];
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3'b111 : q_a <= ram_a[addr_a[0:9]][28:31];
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endcase
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end
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if (we_b) begin
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case (addr_b[10:12])
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3'b000 : ram_b[addr_b[0:9]][0:3] <= data_b[0:3];
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3'b001 : ram_b[addr_b[0:9]][4:7] <= data_b[0:3];
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3'b010 : ram_b[addr_b[0:9]][8:11] <= data_b[0:3];
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3'b011 : ram_b[addr_b[0:9]][12:15] <= data_b[0:3];
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3'b100 : ram_b[addr_b[0:9]][16:19] <= data_b[0:3];
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3'b101 : ram_b[addr_b[0:9]][20:23] <= data_b[0:3];
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3'b110 : ram_b[addr_b[0:9]][24:27] <= data_b[0:3];
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3'b111 : ram_b[addr_b[0:9]][28:31] <= data_b[0:3];
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endcase
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end else begin
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case (addr_b[10:12])
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3'b000 : q_b <= ram_b[addr_b[0:9]][0:3];
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3'b001 : q_b <= ram_b[addr_b[0:9]][4:7];
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3'b010 : q_b <= ram_b[addr_b[0:9]][8:11];
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3'b011 : q_b <= ram_b[addr_b[0:9]][12:15];
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3'b100 : q_b <= ram_b[addr_b[0:9]][16:19];
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3'b101 : q_b <= ram_b[addr_b[0:9]][20:23];
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3'b110 : q_b <= ram_b[addr_b[0:9]][24:27];
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3'b111 : q_b <= ram_b[addr_b[0:9]][28:31];
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endcase
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end
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// Operating mode: dual port RAM 16384 x 2
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end else if (4'b1100 == mode) begin
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if (we_a) begin
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case (addr_a[10:13])
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4'b0000 : ram_a[addr_a[0:9]][0:1] <= data_a[0:1];
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4'b0001 : ram_a[addr_a[0:9]][2:3] <= data_a[0:1];
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4'b0010 : ram_a[addr_a[0:9]][4:5] <= data_a[0:1];
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4'b0011 : ram_a[addr_a[0:9]][6:7] <= data_a[0:1];
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4'b0100 : ram_a[addr_a[0:9]][8:9] <= data_a[0:1];
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4'b0101 : ram_a[addr_a[0:9]][10:11] <= data_a[0:1];
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4'b0110 : ram_a[addr_a[0:9]][12:13] <= data_a[0:1];
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4'b0111 : ram_a[addr_a[0:9]][14:15] <= data_a[0:1];
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4'b1000 : ram_a[addr_a[0:9]][16:17] <= data_a[0:1];
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4'b1001 : ram_a[addr_a[0:9]][18:19] <= data_a[0:1];
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4'b1010 : ram_a[addr_a[0:9]][20:21] <= data_a[0:1];
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4'b1011 : ram_a[addr_a[0:9]][22:23] <= data_a[0:1];
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4'b1100 : ram_a[addr_a[0:9]][24:25] <= data_a[0:1];
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4'b1101 : ram_a[addr_a[0:9]][26:27] <= data_a[0:1];
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4'b1110 : ram_a[addr_a[0:9]][28:29] <= data_a[0:1];
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4'b1111 : ram_a[addr_a[0:9]][30:31] <= data_a[0:1];
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endcase
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end else begin
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case (addr_a[10:13])
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4'b0000 : q_a <= ram_a[addr_a[0:9]][0:1];
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4'b0001 : q_a <= ram_a[addr_a[0:9]][2:3];
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4'b0010 : q_a <= ram_a[addr_a[0:9]][4:5];
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4'b0011 : q_a <= ram_a[addr_a[0:9]][6:7];
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4'b0100 : q_a <= ram_a[addr_a[0:9]][8:9];
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4'b0101 : q_a <= ram_a[addr_a[0:9]][10:11];
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4'b0110 : q_a <= ram_a[addr_a[0:9]][12:13];
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4'b0111 : q_a <= ram_a[addr_a[0:9]][14:15];
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4'b1000 : q_a <= ram_a[addr_a[0:9]][16:17];
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4'b1001 : q_a <= ram_a[addr_a[0:9]][18:19];
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4'b1010 : q_a <= ram_a[addr_a[0:9]][20:21];
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4'b1011 : q_a <= ram_a[addr_a[0:9]][22:23];
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4'b1100 : q_a <= ram_a[addr_a[0:9]][24:25];
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4'b1101 : q_a <= ram_a[addr_a[0:9]][26:27];
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4'b1110 : q_a <= ram_a[addr_a[0:9]][28:29];
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4'b1111 : q_a <= ram_a[addr_a[0:9]][30:31];
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endcase
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end
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if (we_b) begin
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case (addr_b[10:13])
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4'b0000 : ram_b[addr_b[0:9]][0:1] <= data_b[0:1];
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4'b0001 : ram_b[addr_b[0:9]][2:3] <= data_b[0:1];
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4'b0010 : ram_b[addr_b[0:9]][4:5] <= data_b[0:1];
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4'b0011 : ram_b[addr_b[0:9]][6:7] <= data_b[0:1];
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4'b0100 : ram_b[addr_b[0:9]][8:9] <= data_b[0:1];
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4'b0101 : ram_b[addr_b[0:9]][10:11] <= data_b[0:1];
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4'b0110 : ram_b[addr_b[0:9]][12:13] <= data_b[0:1];
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4'b0111 : ram_b[addr_b[0:9]][14:15] <= data_b[0:1];
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4'b1000 : ram_b[addr_b[0:9]][16:17] <= data_b[0:1];
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4'b1001 : ram_b[addr_b[0:9]][18:19] <= data_b[0:1];
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4'b1010 : ram_b[addr_b[0:9]][20:21] <= data_b[0:1];
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4'b1011 : ram_b[addr_b[0:9]][22:23] <= data_b[0:1];
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4'b1100 : ram_b[addr_b[0:9]][24:25] <= data_b[0:1];
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4'b1101 : ram_b[addr_b[0:9]][26:27] <= data_b[0:1];
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4'b1110 : ram_b[addr_b[0:9]][28:29] <= data_b[0:1];
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4'b1111 : ram_b[addr_b[0:9]][30:31] <= data_b[0:1];
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endcase
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end else begin
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case (addr_b[10:13])
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4'b0000 : q_b <= ram_b[addr_b[0:9]][0:1];
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4'b0001 : q_b <= ram_b[addr_b[0:9]][2:3];
|
|
4'b0010 : q_b <= ram_b[addr_b[0:9]][4:5];
|
|
4'b0011 : q_b <= ram_b[addr_b[0:9]][6:7];
|
|
4'b0100 : q_b <= ram_b[addr_b[0:9]][8:9];
|
|
4'b0101 : q_b <= ram_b[addr_b[0:9]][10:11];
|
|
4'b0110 : q_b <= ram_b[addr_b[0:9]][12:13];
|
|
4'b0111 : q_b <= ram_b[addr_b[0:9]][14:15];
|
|
4'b1000 : q_b <= ram_b[addr_b[0:9]][16:17];
|
|
4'b1001 : q_b <= ram_b[addr_b[0:9]][18:19];
|
|
4'b1010 : q_b <= ram_b[addr_b[0:9]][20:21];
|
|
4'b1011 : q_b <= ram_b[addr_b[0:9]][22:23];
|
|
4'b1100 : q_b <= ram_b[addr_b[0:9]][24:25];
|
|
4'b1101 : q_b <= ram_b[addr_b[0:9]][26:27];
|
|
4'b1110 : q_b <= ram_b[addr_b[0:9]][28:29];
|
|
4'b1111 : q_b <= ram_b[addr_b[0:9]][30:31];
|
|
endcase
|
|
end
|
|
// Operating mode: dual port RAM 32768 x 1
|
|
end else if (4'b1101 == mode) begin
|
|
if (we_a) begin
|
|
ram_a[addr_a[0:9]][addr_a[10:14]] <= data_a[0:0];
|
|
end else begin
|
|
q_a <= ram_a[addr_a[0:9]][addr_a[10:14]];
|
|
end
|
|
if (we_b) begin
|
|
ram_b[addr_b[0:9]][addr_b[10:14]] <= data_b[0:0];
|
|
end else begin
|
|
q_b <= ram_b[addr_b[0:9]][addr_b[10:14]];
|
|
end
|
|
end
|
|
end
|
|
endmodule
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