NCSIM

[p***@gmail.com]

Hi ,

I am using NCSIM simulator to simulate my VHDL code, what i wanted to
know is how to generate a Value Change dump(VCD) file using NCSIM, to
load the wave forms offline in simvision.For ex in verilog we have
"$dumpvars" , how to do it for VHDL.


Thanks in advance ,
Praveen

[Andrew Beckett]

Post by p***@gmail.com
Hi ,
I am using NCSIM simulator to simulate my VHDL code, what i wanted to
know is how to generate a Value Change dump(VCD) file using NCSIM, to
load the wave forms offline in simvision.For ex in verilog we have
"$dumpvars" , how to do it for VHDL.
Thanks in advance ,
Praveen

You'd use tcl commands to do this. For example, if this was my VHDL
code:

entity counter is
port(count: out natural);
end entity counter;

architecture behavior of counter is
begin
incrementer : process is
variable count_value: natural:=0;
begin
count<=count_value;
loop
wait for 10 ns;
count_value:=(count_value+1) mod 16;
count<=count_value;
end loop;
end process incrementer;
end architecture behavior;

I'd then do:

ncvhdl -v93 counter.vhd
ncelab -access +rwc counter

and then I'd create a tcl script:

database -vcd mydump.vcd
probe -create :incrementer:count_value
run 200ns
exit

and then do:

ncsim -input counter.tcl counter

If you do:

ncsim -tcl counter

You can enter these commands interactively, or do
things like "help database" to get more detail (if you don't feel like reading
the manual...)

Andrew.