NCsim: script to report 'X' nodes/signals

George_P · Aug 8, 2013

Hi,

I want to get a report from ncsim cadence simulator, listing all the signals that have the value 'X' (e.g. at the current simulation time or throughout the simulation duration, any of the two will do).

Can somebody suggest a way to do it, either using the tool or some scripting? I am thinking of using the "value" command of ncsim, but I don't know how to iterate all the signals in the design.

Thanks,
George

DFT_designer · Aug 8, 2013

Hi,
One way that I am using is to write procedures in test bench, but this solution is to trace only inputs and outputs of the module using signals of test bench not secondary signals of the design.
The idea is to explore the verilog language using simple tasks in the test bench as the following:
task tbench_verif;
reg reg_name (used as global signal);
integer i (integers can be used);
begin
i=0;
while (i < Number)
begin
if (reg_name === 1'bx)
{
$display($time,"ns:"); //display in the console
}
end

Note: I didn't compile the example, but it should work

Regards

George_P · Aug 8, 2013

Thank you, but I need a way to traverse through all the signals of the design to debug gate level simulations.

Regards

DFT_designer said:
Hi,
One way that I am using is to write procedures in test bench, but this solution is to trace only inputs and outputs of the module using signals of test bench not secondary signals of the design.
The idea is to explore the verilog language using simple tasks in the test bench as the following:
task tbench_verif;
reg reg_name (used as global signal);
integer i (integers can be used);
begin
i=0;
while (i < Number)
begin
if (reg_name === 1'bx)
{
$display($time,"ns:"); //display in the console
}
end

Note: I didn't compile the example, but it should work

Regards

NCsim: script to report 'X' nodes/signals

George_P

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DFT_designer

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George_P

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NCsim: script to report 'X' nodes/signals

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