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synth_gatemate: Add block RAM cascade support

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* add simulation model for block RAM cascade in 40K mode
* limit 20K_SDP and 40K_SDP to 40 and 80 bits (the only useful configurations)
This commit is contained in:
Patrick Urban 2021-11-10 16:18:13 +01:00 • committed by Marcelina Kościelnicka
parent 285ec0547b
commit 0d871b6c49
2 changed files with 96 additions and 112 deletions
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174
techlibs/gatemate/cells_sim.v
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@ -666,41 +666,11 @@ module CC_BRAM_20K (
generate
if (RAM_MODE == "SDP") begin
// Port A (write)
if (A_WR_WIDTH <= 1) begin
assign addra = A_ADDR[15:7] + (A_ADDR[15:7]/4);
end
else if (A_WR_WIDTH <= 2) begin
assign addra = A_ADDR[15:7]*2 + (A_ADDR[15:7]/2);
end
else if (A_WR_WIDTH <= 5) begin
assign addra = A_ADDR[15:7]*5;
end
else if (A_WR_WIDTH <= 10) begin
assign addra = A_ADDR[15:7]*10;
end
else if (A_WR_WIDTH <= 20) begin
assign addra = A_ADDR[15:7]*20;
end
else if (A_WR_WIDTH <= 40) begin
if (A_WR_WIDTH == 40) begin
assign addra = A_ADDR[15:7]*40;
end
// Port B (read)
if (B_RD_WIDTH <= 1) begin
assign addrb = B_ADDR[15:7] + (B_ADDR[15:7]/4);
end
else if (B_RD_WIDTH <= 2) begin
assign addrb = B_ADDR[15:7]*2 + (B_ADDR[15:7]/2);
end
else if (B_RD_WIDTH <= 5) begin
assign addrb = B_ADDR[15:7]*5;
end
else if (B_RD_WIDTH <= 10) begin
assign addrb = B_ADDR[15:7]*10;
end
else if (B_RD_WIDTH <= 20) begin
assign addrb = B_ADDR[15:7]*20;
end
else if (B_RD_WIDTH <= 40) begin
if (B_RD_WIDTH == 40) begin
assign addrb = B_ADDR[15:7]*40;
end
end
@ -849,8 +819,8 @@ module CC_BRAM_40K (
output B_ECC_1B_ERR,
output A_ECC_2B_ERR,
output B_ECC_2B_ERR,
output A_CO,
output B_CO,
output reg A_CO = 0,
output reg B_CO = 0,
(* clkbuf_sink *)
input A_CLK,
(* clkbuf_sink *)
@ -1065,6 +1035,14 @@ module CC_BRAM_40K (
$display("ERROR: Port B width of 80 bits is only supported in SDP mode.");
$finish();
end
if (((CAS == "UPPER") || (CAS == "LOWER")) && (WIDTH_MODE_A > 1)) begin
$display("ERROR: Port A cascade mode only supported in 1 bit mode.");
$finish();
end
if (((CAS == "UPPER") || (CAS == "LOWER")) && (WIDTH_MODE_B > 1)) begin
$display("ERROR: Port B cascade mode only supported in 1 bit mode.");
$finish();
end
if ((WIDTH_MODE_A != 80) && (WIDTH_MODE_A != 40) && (WIDTH_MODE_A != 20) && (WIDTH_MODE_A != 10) &&
(WIDTH_MODE_A != 5) && (WIDTH_MODE_A != 2) && (WIDTH_MODE_A != 1) && (WIDTH_MODE_A != 0)) begin
$display("ERROR: Illegal %s Port A width configuration %d.", RAM_MODE, WIDTH_MODE_A);
@ -1075,10 +1053,6 @@ module CC_BRAM_40K (
$display("ERROR: Illegal %s Port B width configuration %d.", RAM_MODE, WIDTH_MODE_B);
$finish();
end
if (CAS != "NONE") begin
$display("WARNING: Cascade simulation model not yet supported.");
$finish();
end
if ((CAS != "NONE") && ((WIDTH_MODE_A > 1) || (WIDTH_MODE_B > 1))) begin
$display("ERROR: Cascade feature only supported in 1 bit data width mode.");
$finish();
@ -1235,47 +1209,11 @@ module CC_BRAM_40K (
generate
if (RAM_MODE == "SDP") begin
// Port A (write)
if (A_WR_WIDTH <= 1) begin
assign addra = A_ADDR[15:7] + (A_ADDR[15:7]/4);
end
else if (A_WR_WIDTH <= 2) begin
assign addra = A_ADDR[15:7]*2 + (A_ADDR[15:7]/2);
end
else if (A_WR_WIDTH <= 5) begin
assign addra = A_ADDR[15:7]*5;
end
else if (A_WR_WIDTH <= 10) begin
assign addra = A_ADDR[15:7]*10;
end
else if (A_WR_WIDTH <= 20) begin
assign addra = A_ADDR[15:7]*20;
end
else if (A_WR_WIDTH <= 40) begin
assign addra = A_ADDR[15:7]*40;
end
else if (A_WR_WIDTH <= 80) begin
if (A_WR_WIDTH == 80) begin
assign addra = A_ADDR[15:7]*80;
end
// Port B (read)
if (B_RD_WIDTH <= 1) begin
assign addrb = B_ADDR[15:7] + (B_ADDR[15:7]/4);
end
else if (B_RD_WIDTH <= 2) begin
assign addrb = B_ADDR[15:7]*2 + (B_ADDR[15:7]/2);
end
else if (B_RD_WIDTH <= 5) begin
assign addrb = B_ADDR[15:7]*5;
end
else if (B_RD_WIDTH <= 10) begin
assign addrb = B_ADDR[15:7]*10;
end
else if (B_RD_WIDTH <= 20) begin
assign addrb = B_ADDR[15:7]*20;
end
else if (B_RD_WIDTH <= 40) begin
assign addrb = B_ADDR[15:7]*40;
end
else if (B_RD_WIDTH <= 80) begin
if (B_RD_WIDTH == 80) begin
assign addrb = B_ADDR[15:7]*80;
end
end
@ -1354,22 +1292,66 @@ module CC_BRAM_40K (
end
end
else if (RAM_MODE == "TDP") begin
// {A,B}_ADDR[0]=0 selects lower, {A,B}_ADDR[0]=1 selects upper cascade memory
wire upper_sel_a = ((CAS == "UPPER") && (A_ADDR[0] == 1));
wire lower_sel_a = ((CAS == "LOWER") && (A_ADDR[0] == 0));
wire upper_sel_b = ((CAS == "UPPER") && (B_ADDR[0] == 1));
wire lower_sel_b = ((CAS == "LOWER") && (B_ADDR[0] == 0));
reg dumm;
// Cascade output port A
always @(*)
begin
if ((A_WR_MODE == "NO_CHANGE") && lower_sel_a) begin
A_CO = memory[addra];
end
else if ((A_WR_MODE == "WRITE_THROUGH") && lower_sel_a) begin
A_CO = ((wea && A_BM[0]) ? (A_DI[0]) : (memory[addra]));
end
end
// Cascade output port B
always @(*)
begin
if ((B_WR_MODE == "NO_CHANGE") && lower_sel_b) begin
B_CO = memory[addrb];
end
else if ((B_WR_MODE == "WRITE_THROUGH") && lower_sel_b) begin
B_CO = ((web && B_BM[0]) ? (B_DI[0]) : (memory[addrb]));
end
end
// TDP port A
always @(posedge clka)
begin
for (i=0; i < WIDTH_MODE_A; i=i+1) begin
if (ena && wea && A_BM[i]) memory[addra+i] <= A_DI[i];
if (upper_sel_a || lower_sel_a || (CAS == "NONE")) begin
if (ena && wea && A_BM[i])
memory[addra+i] <= A_DI[i];
end
if (A_WR_MODE == "NO_CHANGE") begin
if (ena && !wea) A_DO_out[i] <= memory[addra+i];
if (ena && !wea) begin
if (CAS == "UPPER") begin
A_DO_out[i] <= ((A_ADDR[0] == 1) ? (memory[addra+i]) : (A_CI));
end
else if (CAS == "NONE") begin
A_DO_out[i] <= memory[addra+i];
end
end
end
else if (A_WR_MODE == "WRITE_THROUGH") begin
if (ena) begin
if (wea && A_BM[i]) begin
A_DO_out[i] <= A_DI[i];
if (CAS == "UPPER") begin
if (A_ADDR[0] == 1) begin
A_DO_out[i] <= ((wea && A_BM[i]) ? (A_DI[i]) : (memory[addra+i]));
end else begin
A_DO_out[i] <= A_CI;
end
end
else begin
A_DO_out[i] <= memory[addra+i];
else if (CAS == "NONE") begin
A_DO_out[i] <= ((wea && A_BM[i]) ? (A_DI[i]) : (memory[addra+i]));
end
end
end
@ -1379,18 +1361,32 @@ module CC_BRAM_40K (
always @(posedge clkb)
begin
for (i=0; i < WIDTH_MODE_B; i=i+1) begin
if (enb && web && B_BM[i]) memory[addrb+i] <= B_DI[i];
if (upper_sel_b || lower_sel_b || (CAS == "NONE")) begin
if (enb && web && B_BM[i])
memory[addrb+i] <= B_DI[i];
end
if (B_WR_MODE == "NO_CHANGE") begin
if (enb && !web) B_DO_out[i] <= memory[addrb+i];
if (enb && !web) begin
if (CAS == "UPPER") begin
B_DO_out[i] <= ((B_ADDR[0] == 1) ? (memory[addrb+i]) : (B_CI));
end
else if (CAS == "NONE") begin
B_DO_out[i] <= memory[addrb+i];
end
end
end
else if (B_WR_MODE == "WRITE_THROUGH") begin
if (enb) begin
if (web && B_BM[i]) begin
B_DO_out[i] <= B_DI[i];
if (CAS == "UPPER") begin
if (B_ADDR[0] == 1) begin
B_DO_out[i] <= ((web && B_BM[i]) ? (B_DI[i]) : (memory[addrb+i]));
end else begin
B_DO_out[i] <= B_CI;
end
end
else begin
B_DO_out[i] <= memory[addrb+i];
else if (CAS == "NONE") begin
B_DO_out[i] <= ((web && B_BM[i]) ? (B_DI[i]) : (memory[addrb+i]));
end
end
end
@ -1419,5 +1415,5 @@ module CC_BRAM_40K (
else begin
assign B_DO = B_DO_out;
end
endgenerate
endgenerate
endmodule