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7 changed files with 347 additions and 137 deletions

1
sim/.gtkwaverc Normal file
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@ -0,0 +1 @@
splash_disable on

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@ -29,39 +29,45 @@ module DP16KD__INTERNAL#(
wire [DATA_WIDTH-1:0] undef = {DATA_WIDTH{1'bx}};
if (RESETMODE == "SYNC") begin : sync_ram
always @(posedge CLKA) begin
if (RSTA)
DOA <= {DATA_WIDTH {1'b0}};
else if (CEA) begin
if (WEA) begin
ram[ADA] <= DIA;
case (WRITEMODE_A)
"NORMAL": DOA <= undef;
"WRITETHROUGH": DOA <= DIA;
"READBEFOREWRITE": DOA <= ram[ADA];
endcase
end
else
DOA <= ram[ADA];
end
end
wire addr_collision = ADA == ADB;
wire write_collision = addr_collision && WEA && WEB;
wire read_collision = addr_collision && (WEA || WEB);
always @(posedge CLKB) begin
if (RSTB)
DOB <= {DATA_WIDTH {1'b0}};
else if (CEB) begin
if (WEB) begin
ram[ADB] <= DIB;
case (WRITEMODE_B)
"NORMAL": DOB <= undef;
"WRITETHROUGH": DOB <= DIB;
"READBEFOREWRITE": DOB <= ram[ADB];
endcase
if (RESETMODE == "SYNC") begin : sync_ram
always @(posedge CLKA, posedge CLKB) begin
if (CLKA) begin
if (RSTA)
DOA <= {DATA_WIDTH {1'b0}};
else if (CEA) begin
if (WEA) begin
ram[ADA] <= write_collision ? undef : DIA;
case (WRITEMODE_A)
"NORMAL": DOA <= undef;
"WRITETHROUGH": DOA <= DIA;
"READBEFOREWRITE": DOA <= read_collision ? undef : ram[ADA];
endcase
end
else
DOA <= read_collision ? undef : ram[ADA];
end
else
DOB <= ram[ADB];
end
end // if (CLKA)
if (CLKB) begin
if (RSTB)
DOB <= {DATA_WIDTH {1'b0}};
else if (CEB) begin
if (WEB) begin
ram[ADB] <= write_collision ? undef : DIB;
case (WRITEMODE_B)
"NORMAL": DOB <= undef;
"WRITETHROUGH": DOB <= DIB;
"READBEFOREWRITE": DOB <= read_collision ? undef : ram[ADB];
endcase
end
else
DOB <= read_collision ? undef : ram[ADB];
end
end // if (CLKB)
end
end // if (RESETMODE == "SYNC")
else begin : async_ram

38
sim/run.sh Executable file
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@ -0,0 +1,38 @@
#!/usr/bin/env bash
set -euo pipefail
run() {
base="$1"
variant="$2"
shift 2
mkdir -p gen
iverilog -Wall -o test.out "$@" "tb/tb_DP16KD_${base}.v" DP16KD.v
./test.out
rm -f test.out
dir=$(readlink -f `dirname $0`)
vcdfile="${variant}.vcd"
mv tb.vcd "${dir}/gen/$vcdfile"
gtkwfile="${variant}.gtkw"
cp tb_cfg.gtkw "${dir}/gen/$gtkwfile"
perl -p -e "s#WORKING_DIR#$dir#g;" -e "s#VCDFILE#${vcdfile}#g;" -e "s#GTKWFILE#${gtkwfile}#g;" <tb_cfg.gtkw >"${dir}/gen/$gtkwfile"
}
rm -rf gen
run sync_same_width 18b_sync_same_width \
-P tb.DATA_WIDTH_A=18 -P tb.DATA_WIDTH_B=18 \
-P tb.ADDR_WIDTH_A=10 -P tb.ADDR_WIDTH_B=10
run sync_same_width 9b_sync_same_width \
-P tb.DATA_WIDTH_A=9 -P tb.DATA_WIDTH_B=9 \
-P tb.ADDR_WIDTH_A=11 -P tb.ADDR_WIDTH_B=11
run sync_same_width 4b_sync_same_width \
-P tb.DATA_WIDTH_A=4 -P tb.DATA_WIDTH_B=4 \
-P tb.ADDR_WIDTH_A=12 -P tb.ADDR_WIDTH_B=12
run sync_same_width 2b_sync_same_width \
-P tb.DATA_WIDTH_A=2 -P tb.DATA_WIDTH_B=2 \
-P tb.ADDR_WIDTH_A=13 -P tb.ADDR_WIDTH_B=13
run sync_same_width 1b_sync_same_width \
-P tb.DATA_WIDTH_A=1 -P tb.DATA_WIDTH_B=1 \
-P tb.ADDR_WIDTH_A=14 -P tb.ADDR_WIDTH_B=14

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@ -1,106 +0,0 @@
module tb_DP16KD_18b_sync_nowriteout_unregistered();
reg CLKA=0, RSTA=0, CEA=0, OCEA=0, WEA=0;
reg CLKB=0, RSTB=0, CEB=0, OCEB=0, WEB=0;
reg [2:0] CSA=0, CSB=0;
reg [13:0] ADA, ADB;
reg [17:0] DIA, DIB;
wire [17:0] DOA, DOB;
reg [239:0] TESTNAME;
DP16KD ram(.CLKA(CLKA), .RSTA(RSTA), .CEA(CEA), .OCEA(OCEA), .WEA(WEA),
.CSA2(CSA[2]), .CSA1(CSA[1]), .CSA0(CSA[0]),
.ADA13(ADA[13]), .ADA12(ADA[12]), .ADA11(ADA[11]), .ADA10(ADA[10]), .ADA9(ADA[9]), .ADA8(ADA[8]), .ADA7(ADA[7]), .ADA6(ADA[6]), .ADA5(ADA[5]), .ADA4(ADA[4]), .ADA3(ADA[3]), .ADA2(ADA[2]), .ADA1(ADA[1]), .ADA0(ADA[0]),
.DIA17(DIA[17]), .DIA16(DIA[16]), .DIA15(DIA[15]), .DIA14(DIA[14]), .DIA13(DIA[13]), .DIA12(DIA[12]), .DIA11(DIA[11]), .DIA10(DIA[10]), .DIA9(DIA[9]), .DIA8(DIA[8]), .DIA7(DIA[7]), .DIA6(DIA[6]), .DIA5(DIA[5]), .DIA4(DIA[4]), .DIA3(DIA[3]), .DIA2(DIA[2]), .DIA1(DIA[1]), .DIA0(DIA[0]),
.DOA17(DOA[17]), .DOA16(DOA[16]), .DOA15(DOA[15]), .DOA14(DOA[14]), .DOA13(DOA[13]), .DOA12(DOA[12]), .DOA11(DOA[11]), .DOA10(DOA[10]), .DOA9(DOA[9]), .DOA8(DOA[8]), .DOA7(DOA[7]), .DOA6(DOA[6]), .DOA5(DOA[5]), .DOA4(DOA[4]), .DOA3(DOA[3]), .DOA2(DOA[2]), .DOA1(DOA[1]), .DOA0(DOA[0]),
.CLKB(CLKB), .RSTB(RSTB), .CEB(CEB), .OCEB(OCEB), .WEB(WEB),
.CSB2(CSB[2]), .CSB1(CSB[1]), .CSB0(CSB[0]),
.ADB13(ADB[13]), .ADB12(ADB[12]), .ADB11(ADB[11]), .ADB10(ADB[10]), .ADB9(ADB[9]), .ADB8(ADB[8]), .ADB7(ADB[7]), .ADB6(ADB[6]), .ADB5(ADB[5]), .ADB4(ADB[4]), .ADB3(ADB[3]), .ADB2(ADB[2]), .ADB1(ADB[1]), .ADB0(ADB[0]),
.DIB17(DIB[17]), .DIB16(DIB[16]), .DIB15(DIB[15]), .DIB14(DIB[14]), .DIB13(DIB[13]), .DIB12(DIB[12]), .DIB11(DIB[11]), .DIB10(DIB[10]), .DIB9(DIB[9]), .DIB8(DIB[8]), .DIB7(DIB[7]), .DIB6(DIB[6]), .DIB5(DIB[5]), .DIB4(DIB[4]), .DIB3(DIB[3]), .DIB2(DIB[2]), .DIB1(DIB[1]), .DIB0(DIB[0]),
.DOB17(DOB[17]), .DOB16(DOB[16]), .DOB15(DOB[15]), .DOB14(DOB[14]), .DOB13(DOB[13]), .DOB12(DOB[12]), .DOB11(DOB[11]), .DOB10(DOB[10]), .DOB9(DOB[9]), .DOB8(DOB[8]), .DOB7(DOB[7]), .DOB6(DOB[6]), .DOB5(DOB[5]), .DOB4(DOB[4]), .DOB3(DOB[3]), .DOB2(DOB[2]), .DOB1(DOB[1]), .DOB0(DOB[0]));
always begin
#5
CLKA <= !CLKA;
CLKB <= !CLKB;
end
initial begin
$dumpfile("tb_DP16KD_18b_sync_nowriteout_unregistered");
$dumpvars(0, tb_DP16KD_18b_sync_nowriteout_unregistered);
#10
// Write to lowest and highest addrs, read back from the other port.
TESTNAME="SIMPLE WRITE/READ 1";
ADA=0; DIA=42; CEA=1; WEA=1; // Write min addr
ADB=1023; DIB=18'h3FFFF; CEB=1; WEB=1; // write max addr
#10
ADA=1023; DIA=0; CEA=1; WEA=0; // Read max addr
ADB=0; DIB=0; CEB=1; WEB=0; // Read min addr
#10
// Swap values around, read back from other port.
TESTNAME="SIMPLE WRITE/READ 2";
ADA=1023; DIA=42; CEA=1; WEA=1; // Write max addr
ADB=0; DIB=18'h3FFFF; CEB=1; WEB=1; // Write min addr
#10
ADA=0; DIA=0; CEA=1; WEA=0; // Read min addr
ADB=1023; DIB=0; CEB=1; WEB=0; // Read max addr
#10
// No change when reading and not enabled
TESTNAME="NOT ENABLED";
ADA=1023; DIA=0; CEA=0; WEA=0;
ADB=0; DIA=0; CEB=0; WEB=0;
#10
// Output changes again with chip enabled
CEA=1;
CEB=1;
#10
// Same if another chip is selected
TESTNAME="NOT SELECTED";
ADA=1023; DIA=0; WEA=0; CSA=3;
ADB=0; DIB=0; WEB=0; CSB=2;
#10
// Output changes again with chip enabled
CSA=0;
CSB=0;
#10
// Reset clears regs, overrules input, doesn't affect other port,
// doesn't affect memory contents.
TESTNAME="RESET A";
ADA=0; RSTA=1;
#10
RSTA=0;
#10
TESTNAME="RESET B";
ADB=1023; RSTB=1;
#10
RSTB=0;
#10
// Write-write conflict writes undef value
TESTNAME="WRITE/WRITE CONFLICT";
ADA=0; DIA=0; WEA=1;
ADB=0; DIB=18'h3FFFF; WEB=1;
#10
WEA=0;
WEB=0;
#10
// Write-write conflict writes undef value
TESTNAME="A READ/B WRITE CONFLICT";
ADA=0; DIA=0; WEA=0;
ADB=0; DIB=18'h3FFFF; WEB=1;
#10
WEA=0;
WEB=0;
#10
// Write-write conflict writes undef value
TESTNAME="A WRITE/B READ CONFLICT";
ADA=0; DIA=0; WEA=1;
ADB=0; DIB=18'h3FFFF; WEB=0;
#10
WEA=0;
WEB=0;
#10
TESTNAME=240'bx;
#10
$finish;
end
endmodule

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@ -0,0 +1,197 @@
module tb#(
parameter DATA_WIDTH_A=18,
parameter DATA_WIDTH_B=18,
parameter ADDR_WIDTH_A=10,
parameter ADDR_WIDTH_B=10
);
localparam ADDR_MAX_A = 2**ADDR_WIDTH_A - 1;
localparam ADDR_MAX_B = 2**ADDR_WIDTH_B - 1;
localparam DATA_MAX_A = 2**DATA_WIDTH_A - 1;
localparam DATA_MAX_B = 2**DATA_WIDTH_B - 1;
reg CLKA=0, RSTA=0, CEA=0, OCEA=1, WEA=0;
reg CLKB=0, RSTB=0, CEB=0, OCEB=0, WEB=0;
reg [2:0] CSA=0, CSB=0;
reg [13:0] ADA;
reg [13:0] ADB;
reg [17:0] DIA;
reg [17:0] DIB;
wire [17:0] DOA;
wire [17:0] DOB;
reg [17:0] WANTA;
reg [17:0] WANTB;
wire BADA = DOA !== WANTA;
wire BADB = DOB !== WANTB;
reg [239:0] TESTNAME;
wire [17:0] UNDEFA = {DATA_WIDTH_A{1'bx}};
wire [17:0] UNDEFB = {DATA_WIDTH_B{1'bx}};
DP16KD#(.WRITEMODE_A("NORMAL"),
.WRITEMODE_B("NORMAL"),
.REGMODE_A("NOREG"),
.REGMODE_B("NOREG"),
.RESETMODE("SYNC"),
.ASYNC_RESET_RELEASE("SYNC"),
.DATA_WIDTH_A(DATA_WIDTH_A),
.DATA_WIDTH_B(DATA_WIDTH_B)
) uut(.CLKA(CLKA), .RSTA(RSTA), .CEA(CEA), .OCEA(OCEA), .WEA(WEA),
.CSA2(CSA[2]), .CSA1(CSA[1]), .CSA0(CSA[0]),
.ADA13(ADA[13]), .ADA12(ADA[12]), .ADA11(ADA[11]), .ADA10(ADA[10]), .ADA9(ADA[9]), .ADA8(ADA[8]), .ADA7(ADA[7]), .ADA6(ADA[6]), .ADA5(ADA[5]), .ADA4(ADA[4]), .ADA3(ADA[3]), .ADA2(ADA[2]), .ADA1(ADA[1]), .ADA0(ADA[0]),
.DIA17(DIA[17]), .DIA16(DIA[16]), .DIA15(DIA[15]), .DIA14(DIA[14]), .DIA13(DIA[13]), .DIA12(DIA[12]), .DIA11(DIA[11]), .DIA10(DIA[10]), .DIA9(DIA[9]), .DIA8(DIA[8]), .DIA7(DIA[7]), .DIA6(DIA[6]), .DIA5(DIA[5]), .DIA4(DIA[4]), .DIA3(DIA[3]), .DIA2(DIA[2]), .DIA1(DIA[1]), .DIA0(DIA[0]),
.DOA17(DOA[17]), .DOA16(DOA[16]), .DOA15(DOA[15]), .DOA14(DOA[14]), .DOA13(DOA[13]), .DOA12(DOA[12]), .DOA11(DOA[11]), .DOA10(DOA[10]), .DOA9(DOA[9]), .DOA8(DOA[8]), .DOA7(DOA[7]), .DOA6(DOA[6]), .DOA5(DOA[5]), .DOA4(DOA[4]), .DOA3(DOA[3]), .DOA2(DOA[2]), .DOA1(DOA[1]), .DOA0(DOA[0]),
.CLKB(CLKB), .RSTB(RSTB), .CEB(CEB), .OCEB(OCEB), .WEB(WEB),
.CSB2(CSB[2]), .CSB1(CSB[1]), .CSB0(CSB[0]),
.ADB13(ADB[13]), .ADB12(ADB[12]), .ADB11(ADB[11]), .ADB10(ADB[10]), .ADB9(ADB[9]), .ADB8(ADB[8]), .ADB7(ADB[7]), .ADB6(ADB[6]), .ADB5(ADB[5]), .ADB4(ADB[4]), .ADB3(ADB[3]), .ADB2(ADB[2]), .ADB1(ADB[1]), .ADB0(ADB[0]),
.DIB17(DIB[17]), .DIB16(DIB[16]), .DIB15(DIB[15]), .DIB14(DIB[14]), .DIB13(DIB[13]), .DIB12(DIB[12]), .DIB11(DIB[11]), .DIB10(DIB[10]), .DIB9(DIB[9]), .DIB8(DIB[8]), .DIB7(DIB[7]), .DIB6(DIB[6]), .DIB5(DIB[5]), .DIB4(DIB[4]), .DIB3(DIB[3]), .DIB2(DIB[2]), .DIB1(DIB[1]), .DIB0(DIB[0]),
.DOB17(DOB[17]), .DOB16(DOB[16]), .DOB15(DOB[15]), .DOB14(DOB[14]), .DOB13(DOB[13]), .DOB12(DOB[12]), .DOB11(DOB[11]), .DOB10(DOB[10]), .DOB9(DOB[9]), .DOB8(DOB[8]), .DOB7(DOB[7]), .DOB6(DOB[6]), .DOB5(DOB[5]), .DOB4(DOB[4]), .DOB3(DOB[3]), .DOB2(DOB[2]), .DOB1(DOB[1]), .DOB0(DOB[0]));
always begin
#5
CLKA <= !CLKA;
CLKB <= !CLKB;
end
initial begin
$dumpfile("tb");
$dumpvars(0, tb);
#10
// Write to lowest and highest addrs, read back from the other port.
TESTNAME="SIMPLE WRITE/READ 1";
ADA=0; DIA=1; CEA=1; WEA=1; // Write min addr
ADB=ADDR_MAX_B; DIB=DATA_MAX_B; CEB=1; WEB=1; // write max addr
#5
WANTA=UNDEFA;
WANTB=UNDEFB;
#5
ADA=ADDR_MAX_A; DIA=0; CEA=1; WEA=0; // Read max addr
ADB=0; DIB=0; CEB=1; WEB=0; // Read min addr
#5
WANTA=DATA_MAX_A;
WANTB=1;
#5
// Swap values around, read back from other port.
TESTNAME="SIMPLE WRITE/READ 2";
ADA=ADDR_MAX_A-1; DIA=DATA_MAX_A-1; CEA=1; WEA=1; // Write max addr
ADB=1; DIB=2; CEB=1; WEB=1; // Write min addr
#5
WANTA=UNDEFA;
WANTB=UNDEFB;
#5
ADA=1; DIA=0; CEA=1; WEA=0; // Read min addr
ADB=ADDR_MAX_B-1; DIB=0; CEB=1; WEB=0; // Read max addr
#5
WANTA=2;
WANTB=DATA_MAX_B-1;
#5
// No change when reading and not enabled
TESTNAME="NOT ENABLED";
ADA=0; DIA=0; CEA=0; WEA=0;
ADB=0; DIA=0; CEB=0; WEB=0;
#10
// Output changes again with chip enabled
CEA=1;
CEB=1;
#5
WANTA=1;
WANTB=1;
#5
// Same if another chip is selected
TESTNAME="NOT SELECTED";
ADA=ADDR_MAX_A; DIA=0; WEA=0; CSA=3;
ADB=ADDR_MAX_B; DIB=0; WEB=0; CSB=2;
#10
// Output changes again with chip enabled
CSA=0;
CSB=0;
#5
WANTA=DATA_MAX_A;
WANTB=DATA_MAX_B;
#5
// Reset clears regs, overrules input, doesn't affect other port,
// doesn't affect memory contents.
TESTNAME="RESET A";
ADA=0; RSTA=1;
#5
WANTA=0;
#5
RSTA=0;
#5
WANTA=1;
#5;
TESTNAME="RESET B";
ADB=0; RSTB=1;
#5
WANTB=0;
#5
RSTB=0;
#5
WANTB=1;
#5
// Write-write conflict writes undef value
TESTNAME="WRITE/WRITE CONFLICT";
ADA=0; DIA=0; WEA=1;
ADB=0; DIB=DATA_MAX_B; WEB=1;
#5
WANTA=UNDEFA;
WANTB=UNDEFB;
#5
WEA=0;
WEB=0;
#5
WANTA=UNDEFA;
WANTB=UNDEFB;
#5
// Read-write conflict reads undef value
TESTNAME="A READ/B WRITE CONFLICT";
ADA=0; DIA=0; WEA=0;
ADB=0; DIB=DATA_MAX_B; WEB=1;
#5
WANTA=UNDEFA;
WANTB=UNDEFB;
#5
WEA=0;
WEB=0;
#5
WANTA=DATA_MAX_A;
WANTB=DATA_MAX_B;
#5
// Write-read conflict writes undef value
TESTNAME="A WRITE/B READ CONFLICT";
ADA=0; DIA=0; WEA=1;
ADB=0; DIB=DATA_MAX_B; WEB=0;
#5
WANTA=UNDEFA;
WANTB=UNDEFB;
#5
WEA=0;
WEB=0;
#5
WANTA=0;
WANTB=0;
#5
TESTNAME=240'bx;
#10
$finish;
end
endmodule

73
sim/tb_cfg.gtkw Normal file
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@ -0,0 +1,73 @@
[*]
[*] GTKWave Analyzer v3.3.120 (w)1999-2024 BSI
[*] Sat Aug 31 03:16:28 2024
[*]
[dumpfile] "WORKING_DIR/VCDFILE"
[dumpfile_mtime] "Sat Aug 31 03:12:41 2024"
[dumpfile_size] 28485
[savefile] "WORKING_DIR/GTKWFILE"
[timestart] 0
[size] 2556 660
[pos] -1 -1
*-4.261485 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
[treeopen] tb.
[treeopen] tb.uut.
[sst_width] 282
[signals_width] 150
[sst_expanded] 1
[sst_vpaned_height] 164
@820
[color] 5
tb.TESTNAME[239:0]
[color] 5
tb.WRITEMODE_A
@821
[color] 5
tb.WRITEMODE_B
@200
-
@28
tb.RSTA
tb.CEA
tb.CSA[2:0]
@22
tb.ADA[13:0]
tb.DIA[17:0]
@28
[color] 3
tb.WEA
[color] 7
tb.CLKA
@22
tb.DOA[17:0]
[color] 2
tb.WANTA[17:0]
@28
[color] 1
tb.BADA
@200
-
-
@28
tb.RSTB
@29
tb.CEB
@28
tb.CSB[2:0]
@22
tb.ADB[13:0]
tb.DIB[17:0]
@28
[color] 3
tb.WEB
[color] 7
tb.CLKB
@22
tb.DOB[17:0]
[color] 2
tb.WANTB[17:0]
@28
[color] 1
tb.BADB
[pattern_trace] 1
[pattern_trace] 0

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@ -155,6 +155,7 @@ def synth(c, target):
print(f" Log : {yosys_log}")
print(f" Flat : {yosys_preprocessed}")
print(f"Compiled : {yosys_compiled}")
print(f" Dot : {yosys_preprocessed_graph}.dot")
pin_map = target.parent / "pin_map.lpf"
if not pin_map.is_file():