XST Fails 2D array wild card sensitivity list

[cfelton]

XST Fails 2D array wild card sensitivity list


XST fails the following Verilog (similar HDL) where other synthesizers
compilers do not?

wire [15:0] x [0:15];
wire [15:0] y [0:15];
wire [15:0] z;

wire [15:0] xo [0:15];
wire [15:0] yo [0:15];


always @(*) begin
if (cnt < 8) begin
xo[cnt] = x[cnt];
yo[cnt] = y[cnt];
end
else begin
xo[cnt] = z;
yo[cnt] = 16’b0;
end
end


HDL similar to the above fails in XST but synthesizes / compiles correctl
in all of the following

Icarus Verilog
Modelsim
Ncsim
Cadence RTL Compiler
Synplify Pro
Altera Quartus

Does XST simply not support this?
Or is the above not defined by the Verilog 1364 and the others just suppor
it anyway? Or is there an XST switch that I am missing?


.chris


---------------------------------------
Posted through http://www.FPGARelated.com

 

[maxascent]

XST Fails 2D array wild card sensitivity list


XST fails the following Verilog (similar HDL) where other synthesizers /
compilers do not?

wire [15:0] x [0:15];
wire [15:0] y [0:15];
wire [15:0] z;

wire [15:0] xo [0:15];
wire [15:0] yo [0:15];


always @(*) begin
if (cnt < 8) begin
xo[cnt] = x[cnt];
yo[cnt] = y[cnt];
end
else begin
xo[cnt] = z;
yo[cnt] = 16’b0;
end
end


HDL similar to the above fails in XST but synthesizes / compile
correctly
in all of the following

Icarus Verilog
Modelsim
Ncsim
Cadence RTL Compiler
Synplify Pro
Altera Quartus

Does XST simply not support this?
Or is the above not defined by the Verilog 1364 and the others jus
support
it anyway? Or is there an XST switch that I am missing?


chris


---------------------------------------
Posted through http://www.FPGARelated.com

I think your problem may be the array indexing. I had a similar problem an
had to use an assign statement to fix it.

Jon

---------------------------------------
Posted through http://www.FPGARelated.com

 

[OutputLogic]

Hi,

There is a Xilinx answer record that addresses this issue:
http://www.xilinx.com/support/answers/20391.htm

Thanks,
Evgeni