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Added support for initialized xilinx brams

This commit is contained in:
Clifford Wolf 2015-04-06 17:07:10 +02:00
parent 169d1c4711
commit 8520b7fbe0
11 changed files with 313 additions and 90 deletions
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2
README
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@ -56,7 +56,7 @@ For example on Ubuntu Linux 14.04 LTS the following commands will install all
prerequisites for building yosys:
$ yosys_deps="build-essential clang bison flex libreadline-dev gawk
tcl-dev libffi-dev git mercurial graphviz xdot pkg-config"
tcl-dev libffi-dev git mercurial graphviz xdot pkg-config python"
$ sudo apt-get install $yosys_deps
There are also pre-compiled Yosys binary packages for Ubuntu and Win32 as well

2
techlibs/xilinx/.gitignore vendored Normal file
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@ -0,0 +1,2 @@
brams_init.mk
brams_init_*.vh

21
techlibs/xilinx/Makefile.inc
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@ -1,10 +1,31 @@
OBJS += techlibs/xilinx/synth_xilinx.o
GENFILES += techlibs/xilinx/brams_init_36.vh
GENFILES += techlibs/xilinx/brams_init_32.vh
GENFILES += techlibs/xilinx/brams_init_18.vh
GENFILES += techlibs/xilinx/brams_init_16.vh
EXTRA_OBJS += techlibs/xilinx/brams_init.mk
.SECONDARY: techlibs/xilinx/brams_init.mk
techlibs/xilinx/brams_init.mk: techlibs/xilinx/brams_init.py
cd techlibs/xilinx && python brams_init.py
touch techlibs/xilinx/brams_init.mk
techlibs/xilinx/brams_init_36.vh: techlibs/xilinx/brams_init.mk
techlibs/xilinx/brams_init_32.vh: techlibs/xilinx/brams_init.mk
techlibs/xilinx/brams_init_18.vh: techlibs/xilinx/brams_init.mk
techlibs/xilinx/brams_init_16.vh: techlibs/xilinx/brams_init.mk
$(eval $(call add_share_file,share/xilinx,techlibs/xilinx/cells_map.v))
$(eval $(call add_share_file,share/xilinx,techlibs/xilinx/cells_sim.v))
$(eval $(call add_share_file,share/xilinx,techlibs/xilinx/brams.txt))
$(eval $(call add_share_file,share/xilinx,techlibs/xilinx/brams_map.v))
$(eval $(call add_share_file,share/xilinx,techlibs/xilinx/brams_init_36.vh))
$(eval $(call add_share_file,share/xilinx,techlibs/xilinx/brams_init_32.vh))
$(eval $(call add_share_file,share/xilinx,techlibs/xilinx/brams_init_18.vh))
$(eval $(call add_share_file,share/xilinx,techlibs/xilinx/brams_init_16.vh))
$(eval $(call add_share_file,share/xilinx,techlibs/xilinx/brams_bb.v))
$(eval $(call add_share_file,share/xilinx,techlibs/xilinx/arith_map.v))

4
techlibs/xilinx/brams.txt
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@ -1,5 +1,6 @@
bram $__XILINX_RAMB36_SDP
init 1
abits 9
dbits 72
groups 2
@ -12,6 +13,7 @@ bram $__XILINX_RAMB36_SDP
endbram
bram $__XILINX_RAMB18_SDP
init 1
abits 9
dbits 36
groups 2
@ -24,6 +26,7 @@ bram $__XILINX_RAMB18_SDP
endbram
bram $__XILINX_RAMB36_TDP
init 1
abits 10 @a10d36
dbits 36 @a10d36
abits 11 @a11d18
@ -48,6 +51,7 @@ bram $__XILINX_RAMB36_TDP
endbram
bram $__XILINX_RAMB18_TDP
init 1
abits 10 @a10d18
dbits 18 @a10d18
abits 11 @a11d9

37
techlibs/xilinx/brams_init.py Normal file
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@ -0,0 +1,37 @@
#!/usr/bin/python
from __future__ import division
from __future__ import print_function
with open("brams_init_18.vh", "w") as f:
for i in range(8):
init_snippets = ["INIT[%3d*9+8]" % (k+256*i,) for k in range(255, -1, -1)]
for k in range(4, 256, 4):
init_snippets[k] = "\n " + init_snippets[k]
print(".INITP_%02X({%s})," % (i, ", ".join(init_snippets)), file=f)
for i in range(64):
init_snippets = ["INIT[%3d*9 +: 8]" % (k+32*i,) for k in range(31, -1, -1)]
for k in range(4, 32, 4):
init_snippets[k] = "\n " + init_snippets[k]
print(".INIT_%02X({%s})," % (i, ", ".join(init_snippets)), file=f)
with open("brams_init_36.vh", "w") as f:
for i in range(16):
init_snippets = ["INIT[%3d*9+8]" % (k+256*i,) for k in range(255, -1, -1)]
for k in range(4, 256, 4):
init_snippets[k] = "\n " + init_snippets[k]
print(".INITP_%02X({%s})," % (i, ", ".join(init_snippets)), file=f)
for i in range(128):
init_snippets = ["INIT[%3d*9 +: 8]" % (k+32*i,) for k in range(31, -1, -1)]
for k in range(4, 32, 4):
init_snippets[k] = "\n " + init_snippets[k]
print(".INIT_%02X({%s})," % (i, ", ".join(init_snippets)), file=f)
with open("brams_init_16.vh", "w") as f:
for i in range(64):
print(".INIT_%02X(INIT[%3d*256 +: 256])," % (i, i), file=f)
with open("brams_init_32.vh", "w") as f:
for i in range(128):
print(".INIT_%02X(INIT[%3d*256 +: 256])," % (i, i), file=f)

228
techlibs/xilinx/brams_map.v
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@ -1,6 +1,7 @@
module \$__XILINX_RAMB36_SDP (CLK2, CLK3, A1ADDR, A1DATA, B1ADDR, B1DATA, B1EN);
parameter CLKPOL2 = 1;
parameter CLKPOL3 = 1;
parameter [36863:0] INIT = 36864'bx;
input CLK2;
input CLK3;
@ -32,6 +33,7 @@ module \$__XILINX_RAMB36_SDP (CLK2, CLK3, A1ADDR, A1DATA, B1ADDR, B1DATA, B1EN);
.WRITE_MODE_B("READ_FIRST"),
.IS_CLKARDCLK_INVERTED(!CLKPOL2),
.IS_CLKBWRCLK_INVERTED(!CLKPOL3),
`include "brams_init_36.vh"
.SIM_DEVICE("7SERIES")
) _TECHMAP_REPLACE_ (
.DOBDO(DO[63:32]),
@ -66,6 +68,7 @@ endmodule
module \$__XILINX_RAMB18_SDP (CLK2, CLK3, A1ADDR, A1DATA, B1ADDR, B1DATA, B1EN);
parameter CLKPOL2 = 1;
parameter CLKPOL3 = 1;
parameter [18431:0] INIT = 18432'bx;
input CLK2;
input CLK3;
@ -94,6 +97,7 @@ module \$__XILINX_RAMB18_SDP (CLK2, CLK3, A1ADDR, A1DATA, B1ADDR, B1DATA, B1EN);
.WRITE_MODE_B("READ_FIRST"),
.IS_CLKARDCLK_INVERTED(!CLKPOL2),
.IS_CLKBWRCLK_INVERTED(!CLKPOL3),
`include "brams_init_18.vh"
.SIM_DEVICE("7SERIES")
) _TECHMAP_REPLACE_ (
.DOBDO(DO[31:16]),
@ -132,6 +136,7 @@ module \$__XILINX_RAMB36_TDP (CLK2, CLK3, A1ADDR, A1DATA, B1ADDR, B1DATA, B1EN);
parameter CLKPOL2 = 1;
parameter CLKPOL3 = 1;
parameter [36863:0] INIT = 36864'bx;
input CLK2;
input CLK3;
@ -156,42 +161,83 @@ module \$__XILINX_RAMB36_TDP (CLK2, CLK3, A1ADDR, A1DATA, B1ADDR, B1DATA, B1EN);
assign A1DATA = { DOP[3], DO[31:24], DOP[2], DO[23:16], DOP[1], DO[15: 8], DOP[0], DO[ 7: 0] };
assign { DIP[3], DI[31:24], DIP[2], DI[23:16], DIP[1], DI[15: 8], DIP[0], DI[ 7: 0] } = B1DATA;
RAMB36E1 #(
.RAM_MODE("TDP"),
.READ_WIDTH_A(CFG_DBITS),
.READ_WIDTH_B(CFG_DBITS),
.WRITE_WIDTH_A(CFG_DBITS),
.WRITE_WIDTH_B(CFG_DBITS),
.WRITE_MODE_A("READ_FIRST"),
.WRITE_MODE_B("READ_FIRST"),
.IS_CLKARDCLK_INVERTED(!CLKPOL2),
.IS_CLKBWRCLK_INVERTED(!CLKPOL3),
.SIM_DEVICE("7SERIES")
) _TECHMAP_REPLACE_ (
.DIADI(32'd0),
.DIPADIP(4'd0),
.DOADO(DO[31:0]),
.DOPADOP(DOP[3:0]),
.ADDRARDADDR(A1ADDR_16),
.CLKARDCLK(CLK2),
.ENARDEN(|1),
.REGCEAREGCE(|1),
.RSTRAMARSTRAM(|0),
.RSTREGARSTREG(|0),
.WEA(4'b0),
generate if (CFG_DBITS > 8) begin
RAMB36E1 #(
.RAM_MODE("TDP"),
.READ_WIDTH_A(CFG_DBITS),
.READ_WIDTH_B(CFG_DBITS),
.WRITE_WIDTH_A(CFG_DBITS),
.WRITE_WIDTH_B(CFG_DBITS),
.WRITE_MODE_A("READ_FIRST"),
.WRITE_MODE_B("READ_FIRST"),
.IS_CLKARDCLK_INVERTED(!CLKPOL2),
.IS_CLKBWRCLK_INVERTED(!CLKPOL3),
`include "brams_init_36.vh"
.SIM_DEVICE("7SERIES")
) _TECHMAP_REPLACE_ (
.DIADI(32'd0),
.DIPADIP(4'd0),
.DOADO(DO[31:0]),
.DOPADOP(DOP[3:0]),
.ADDRARDADDR(A1ADDR_16),
.CLKARDCLK(CLK2),
.ENARDEN(|1),
.REGCEAREGCE(|1),
.RSTRAMARSTRAM(|0),
.RSTREGARSTREG(|0),
.WEA(4'b0),
.DIBDI(DI),
.DIPBDIP(DIP),
.DOBDO(DOBDO),
.DOPBDOP(DOPBDOP),
.ADDRBWRADDR(B1ADDR_16),
.CLKBWRCLK(CLK3),
.ENBWREN(|1),
.REGCEB(|0),
.RSTRAMB(|0),
.RSTREGB(|0),
.WEBWE(B1EN_8)
);
.DIBDI(DI),
.DIPBDIP(DIP),
.DOBDO(DOBDO),
.DOPBDOP(DOPBDOP),
.ADDRBWRADDR(B1ADDR_16),
.CLKBWRCLK(CLK3),
.ENBWREN(|1),
.REGCEB(|0),
.RSTRAMB(|0),
.RSTREGB(|0),
.WEBWE(B1EN_8)
);
end else begin
RAMB36E1 #(
.RAM_MODE("TDP"),
.READ_WIDTH_A(CFG_DBITS),
.READ_WIDTH_B(CFG_DBITS),
.WRITE_WIDTH_A(CFG_DBITS),
.WRITE_WIDTH_B(CFG_DBITS),
.WRITE_MODE_A("READ_FIRST"),
.WRITE_MODE_B("READ_FIRST"),
.IS_CLKARDCLK_INVERTED(!CLKPOL2),
.IS_CLKBWRCLK_INVERTED(!CLKPOL3),
`include "brams_init_32.vh"
.SIM_DEVICE("7SERIES")
) _TECHMAP_REPLACE_ (
.DIADI(32'd0),
.DIPADIP(4'd0),
.DOADO(DO[31:0]),
.DOPADOP(DOP[3:0]),
.ADDRARDADDR(A1ADDR_16),
.CLKARDCLK(CLK2),
.ENARDEN(|1),
.REGCEAREGCE(|1),
.RSTRAMARSTRAM(|0),
.RSTREGARSTREG(|0),
.WEA(4'b0),
.DIBDI(DI),
.DIPBDIP(DIP),
.DOBDO(DOBDO),
.DOPBDOP(DOPBDOP),
.ADDRBWRADDR(B1ADDR_16),
.CLKBWRCLK(CLK3),
.ENBWREN(|1),
.REGCEB(|0),
.RSTRAMB(|0),
.RSTREGB(|0),
.WEBWE(B1EN_8)
);
end endgenerate
endmodule
// ------------------------------------------------------------------------
@ -203,6 +249,7 @@ module \$__XILINX_RAMB18_TDP (CLK2, CLK3, A1ADDR, A1DATA, B1ADDR, B1DATA, B1EN);
parameter CLKPOL2 = 1;
parameter CLKPOL3 = 1;
parameter [18431:0] INIT = 18432'bx;
input CLK2;
input CLK3;
@ -227,41 +274,82 @@ module \$__XILINX_RAMB18_TDP (CLK2, CLK3, A1ADDR, A1DATA, B1ADDR, B1DATA, B1EN);
assign A1DATA = { DOP[1], DO[15: 8], DOP[0], DO[ 7: 0] };
assign { DIP[1], DI[15: 8], DIP[0], DI[ 7: 0] } = B1DATA;
RAMB18E1 #(
.RAM_MODE("TDP"),
.READ_WIDTH_A(CFG_DBITS),
.READ_WIDTH_B(CFG_DBITS),
.WRITE_WIDTH_A(CFG_DBITS),
.WRITE_WIDTH_B(CFG_DBITS),
.WRITE_MODE_A("READ_FIRST"),
.WRITE_MODE_B("READ_FIRST"),
.IS_CLKARDCLK_INVERTED(!CLKPOL2),
.IS_CLKBWRCLK_INVERTED(!CLKPOL3),
.SIM_DEVICE("7SERIES")
) _TECHMAP_REPLACE_ (
.DIADI(16'b0),
.DIPADIP(2'b0),
.DOADO(DO),
.DOPADOP(DOP),
.ADDRARDADDR(A1ADDR_14),
.CLKARDCLK(CLK2),
.ENARDEN(|1),
.REGCEAREGCE(|1),
.RSTRAMARSTRAM(|0),
.RSTREGARSTREG(|0),
.WEA(2'b0),
generate if (CFG_DBITS > 8) begin
RAMB18E1 #(
.RAM_MODE("TDP"),
.READ_WIDTH_A(CFG_DBITS),
.READ_WIDTH_B(CFG_DBITS),
.WRITE_WIDTH_A(CFG_DBITS),
.WRITE_WIDTH_B(CFG_DBITS),
.WRITE_MODE_A("READ_FIRST"),
.WRITE_MODE_B("READ_FIRST"),
.IS_CLKARDCLK_INVERTED(!CLKPOL2),
.IS_CLKBWRCLK_INVERTED(!CLKPOL3),
`include "brams_init_18.vh"
.SIM_DEVICE("7SERIES")
) _TECHMAP_REPLACE_ (
.DIADI(16'b0),
.DIPADIP(2'b0),
.DOADO(DO),
.DOPADOP(DOP),
.ADDRARDADDR(A1ADDR_14),
.CLKARDCLK(CLK2),
.ENARDEN(|1),
.REGCEAREGCE(|1),
.RSTRAMARSTRAM(|0),
.RSTREGARSTREG(|0),
.WEA(2'b0),
.DIBDI(DI),
.DIPBDIP(DIP),
.DOBDO(DOBDO),
.DOPBDOP(DOPBDOP),
.ADDRBWRADDR(B1ADDR_14),
.CLKBWRCLK(CLK3),
.ENBWREN(|1),
.REGCEB(|0),
.RSTRAMB(|0),
.RSTREGB(|0),
.WEBWE(B1EN_4)
);
.DIBDI(DI),
.DIPBDIP(DIP),
.DOBDO(DOBDO),
.DOPBDOP(DOPBDOP),
.ADDRBWRADDR(B1ADDR_14),
.CLKBWRCLK(CLK3),
.ENBWREN(|1),
.REGCEB(|0),
.RSTRAMB(|0),
.RSTREGB(|0),
.WEBWE(B1EN_4)
);
end else begin
RAMB18E1 #(
.RAM_MODE("TDP"),
.READ_WIDTH_A(CFG_DBITS),
.READ_WIDTH_B(CFG_DBITS),
.WRITE_WIDTH_A(CFG_DBITS),
.WRITE_WIDTH_B(CFG_DBITS),
.WRITE_MODE_A("READ_FIRST"),
.WRITE_MODE_B("READ_FIRST"),
.IS_CLKARDCLK_INVERTED(!CLKPOL2),
.IS_CLKBWRCLK_INVERTED(!CLKPOL3),
`include "brams_init_16.vh"
.SIM_DEVICE("7SERIES")
) _TECHMAP_REPLACE_ (
.DIADI(16'b0),
.DIPADIP(2'b0),
.DOADO(DO),
.DOPADOP(DOP),
.ADDRARDADDR(A1ADDR_14),
.CLKARDCLK(CLK2),
.ENARDEN(|1),
.REGCEAREGCE(|1),
.RSTRAMARSTRAM(|0),
.RSTREGARSTREG(|0),
.WEA(2'b0),
.DIBDI(DI),
.DIPBDIP(DIP),
.DOBDO(DOBDO),
.DOPBDOP(DOPBDOP),
.ADDRBWRADDR(B1ADDR_14),
.CLKBWRCLK(CLK3),
.ENBWREN(|1),
.REGCEB(|0),
.RSTRAMB(|0),
.RSTREGB(|0),
.WEBWE(B1EN_4)
);
end endgenerate
endmodule

17
techlibs/xilinx/tests/bram1.v
View File

@ -10,10 +10,27 @@ module bram1 #(
input [ABITS-1:0] RD_ADDR,
output [DBITS-1:0] RD_DATA
);
localparam [ABITS-1:0] INIT_ADDR_0 = 1234;
localparam [ABITS-1:0] INIT_ADDR_1 = 4321;
localparam [ABITS-1:0] INIT_ADDR_2 = 2**ABITS-1;
localparam [ABITS-1:0] INIT_ADDR_3 = (2**ABITS-1) / 2;
localparam [DBITS-1:0] INIT_DATA_0 = 128'h 51e152a7300e309ccb8cd06d34558f49;
localparam [DBITS-1:0] INIT_DATA_1 = 128'h 07b1fe94a530ddf3027520f9d23ab43e;
localparam [DBITS-1:0] INIT_DATA_2 = 128'h 3cedc6de43ef3f607af3193658d0eb0b;
localparam [DBITS-1:0] INIT_DATA_3 = 128'h f6bc5514a8abf1e2810df966bcc13b46;
reg [DBITS-1:0] memory [0:2**ABITS-1];
reg [ABITS-1:0] RD_ADDR_BUF;
reg [DBITS-1:0] RD_DATA_BUF;
initial begin
memory[INIT_ADDR_0] <= INIT_DATA_0;
memory[INIT_ADDR_1] <= INIT_DATA_1;
memory[INIT_ADDR_2] <= INIT_DATA_2;
memory[INIT_ADDR_3] <= INIT_DATA_3;
end
always @(posedge clk) begin
if (WR_EN) memory[WR_ADDR] <= WR_DATA;
RD_ADDR_BUF <= RD_ADDR;

52
techlibs/xilinx/tests/bram1_tb.v
View File

@ -8,6 +8,16 @@ module bram1_tb #(
reg [ABITS-1:0] RD_ADDR;
wire [DBITS-1:0] RD_DATA;
localparam [ABITS-1:0] INIT_ADDR_0 = 1234;
localparam [ABITS-1:0] INIT_ADDR_1 = 4321;
localparam [ABITS-1:0] INIT_ADDR_2 = 2**ABITS-1;
localparam [ABITS-1:0] INIT_ADDR_3 = (2**ABITS-1) / 2;
localparam [DBITS-1:0] INIT_DATA_0 = 128'h 51e152a7300e309ccb8cd06d34558f49;
localparam [DBITS-1:0] INIT_DATA_1 = 128'h 07b1fe94a530ddf3027520f9d23ab43e;
localparam [DBITS-1:0] INIT_DATA_2 = 128'h 3cedc6de43ef3f607af3193658d0eb0b;
localparam [DBITS-1:0] INIT_DATA_3 = 128'h f6bc5514a8abf1e2810df966bcc13b46;
bram1 #(
// .ABITS(ABITS),
// .DBITS(DBITS),
@ -68,6 +78,11 @@ module bram1_tb #(
// $dumpfile("testbench.vcd");
// $dumpvars(0, bram1_tb);
memory[INIT_ADDR_0] = INIT_DATA_0;
memory[INIT_ADDR_1] = INIT_DATA_1;
memory[INIT_ADDR_2] = INIT_DATA_2;
memory[INIT_ADDR_3] = INIT_DATA_3;
xorshift64_next;
xorshift64_next;
xorshift64_next;
@ -84,16 +99,33 @@ module bram1_tb #(
clk <= 0;
for (i = 0; i < 512; i = i+1) begin
if (DBITS > 64)
WR_DATA <= (xorshift64_state << (DBITS-64)) ^ xorshift64_state;
else
WR_DATA <= xorshift64_state;
xorshift64_next;
WR_ADDR <= getaddr(i < 256 ? i[7:4] : xorshift64_state[63:60]);
xorshift64_next;
RD_ADDR <= getaddr(i < 256 ? i[3:0] : xorshift64_state[59:56]);
WR_EN <= xorshift64_state[55];
xorshift64_next;
if (i == 0) begin
WR_EN <= 0;
RD_ADDR <= INIT_ADDR_0;
end else
if (i == 1) begin
WR_EN <= 0;
RD_ADDR <= INIT_ADDR_1;
end else
if (i == 2) begin
WR_EN <= 0;
RD_ADDR <= INIT_ADDR_2;
end else
if (i == 3) begin
WR_EN <= 0;
RD_ADDR <= INIT_ADDR_3;
end else begin
if (DBITS > 64)
WR_DATA <= (xorshift64_state << (DBITS-64)) ^ xorshift64_state;
else
WR_DATA <= xorshift64_state;
xorshift64_next;
WR_ADDR <= getaddr(i < 256 ? i[7:4] : xorshift64_state[63:60]);
xorshift64_next;
RD_ADDR <= getaddr(i < 256 ? i[3:0] : xorshift64_state[59:56]);
WR_EN <= xorshift64_state[55];
xorshift64_next;
end
#1; clk <= 1;
#1; clk <= 0;

2
techlibs/xilinx/tests/bram2.sh
View File

@ -3,6 +3,6 @@
set -ex
unisims=/opt/Xilinx/Vivado/2014.4/data/verilog/src/unisims
../../../yosys -v2 -l bram2.log -p synth_xilinx -o bram2_syn.v bram2.v
iverilog -o bram2_tb bram2_tb.v bram2_syn.v -y $unisims $unisims/../glbl.v
iverilog -T typ -o bram2_tb bram2_tb.v bram2_syn.v -y $unisims $unisims/../glbl.v
vvp -N bram2_tb

19
techlibs/xilinx/tests/bram2.v
View File

@ -1,18 +1,29 @@
module myram(
input rd_clk,
input [ 7:0] rd_addr,
output reg [15:0] rd_data,
output reg [17:0] rd_data,
input wr_clk,
input wr_enable,
input [ 7:0] wr_addr,
input [15:0] wr_data
input [17:0] wr_data
);
reg [15:0] memory [0:255];
reg [17:0] memory [0:255];
integer i;
function [17:0] hash(input [7:0] k);
reg [31:0] x;
begin
x = {k, ~k, k, ~k};
x = x ^ (x << 13);
x = x ^ (x >> 17);
x = x ^ (x << 5);
hash = x;
end
endfunction
initial begin
for (i = 0; i < 256; i = i+1)
memory[i] = i;
memory[i] = hash(i);
end
always @(posedge rd_clk)

19
techlibs/xilinx/tests/bram2_tb.v
View File

@ -3,12 +3,23 @@
module testbench;
reg rd_clk;
reg [ 7:0] rd_addr;
wire [15:0] rd_data;
wire [17:0] rd_data;
wire wr_clk = 0;
wire wr_enable = 0;
wire [ 7:0] wr_addr = 0;
wire [15:0] wr_data = 0;
wire [17:0] wr_data = 0;
function [17:0] hash(input [7:0] k);
reg [31:0] x;
begin
x = {k, ~k, k, ~k};
x = x ^ (x << 13);
x = x ^ (x >> 17);
x = x ^ (x << 5);
hash = x;
end
endfunction
myram uut (
.rd_clk (rd_clk ),
@ -34,8 +45,8 @@ module testbench;
rd_addr <= rd_addr + 1;
@(posedge rd_clk);
// $display("%3d %3d", i, rd_data);
if (i != rd_data) begin
$display("[%1t] ERROR: addr=%3d, data=%3d", $time, i, rd_data);
if (hash(i) !== rd_data) begin
$display("[%1t] ERROR: addr=%3d, data_mem=%18b, data_ref=%18b", $time, i, rd_data, hash(i));
$stop;
end
end