How to use $time in verilog?

[hsr...@my-deja.com]

Hello,

Could anybody help me as how to use $time in verilog.

I need a timestamp of start of some event and the end of the same.
for instance.

The timestamp should start at the rising edge of a signal called UP and
should end at the rising edge of the other signal DOWN.

The time is actually the diffrence between DOWN - UP.

Please help me.

Hari.

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[Xanatos]

<hsr...@my-deja.com> wrote in message news:8e1s4r$psg$1...@nnrp1.deja.com...

> Hello,
>
> Could anybody help me as how to use $time in verilog.
>
> I need a timestamp of start of some event and the end of the same.
> for instance.
>
> The timestamp should start at the rising edge of a signal called UP and
> should end at the rising edge of the other signal DOWN.
>
> The time is actually the diffrence between DOWN - UP.
>
> Please help me.
>
> Hari.
>

Hari,

This should get you started....

@(posedge UP) $display("%0t : UP", $time);
@(posedge DOWN) $display("%0t : DOWN", $time);

Cheers,
Xanatos

[igla...@my-deja.com]

Hi,

Just a small addition, incase you don't want to diaplay you can
store the $time and make your own calculation

e.g. if you want to check the ck->out of output signal name sig you can
do something like:

integer clk_time, sig_time, sig_ck2o;

always @ (posedge clk)
clk_time = $time;

always @ (sig)
begin
sig_time = $time;
sig_ck2o = sig_time - clk_time ;
$display ("%0t SIG Have CK->Q of %d ns",$time,sig_ck2o);
end

etc

have a nice day

Illan

In article <AY_M4.143622$1C2.3...@news20.bellglobal.com>,

[Utku Ozcan]

And my recommendation is to use $timeformat system task. Whenever
you print the time with $time and %t into the stdout, normally you
don't see the timeunit. $timeformat enables you to scale your time
value. $timeformat must be used in a separate initial:

initial
begin
$timeformat ("-9, 0, " ns.", 5);
end

...where -9 is unit (here unit is ns.), 0 is precision after
".", the string " ns." is appended at each %t printing. 5 is
the minimum string length to print the time information.

Utku

--
I feel better than James Brown.

[igla...@my-deja.com]

Hi,

I myeslf prefare the %0t on %t .

have a nice day

Illan

In article <39053117...@netas.com.tr>,

[Utku Ozcan]

>
> I myeslf prefare the %0t on %t .
>
> have a nice day
>
> Illan

I also use %0t, also %0h, %0d. But still no workaround for
hexadecimal formatting for capital letters!!

[igla...@my-deja.com]

Hi,

Any specail reason why I would like the hex to be capiatal letter ?

maybe in 20 years from now when my eye sight want be as good but except
for that ?

Have a nice day

Illan

In article <390680A4...@netas.com.tr>,

[Thomas C. Jones]

It helps when you're comparing with other data written in all caps. ~Tom

[igla...@my-deja.com]

Hi,

Assuming you use diff than just use diff -i

Have a nice day

Illan

In article <3907760C...@sebringring.com>,

[igla...@my-deja.com]

Hi,

Assuming you use diff than just use diff -i

or you can also use tr 'a-f' 'A-F'