System Tasks in VHDL

Hi All,

Do we have any System Tasks and Function in VHDL similar to Verilog
like $stop, $finish

which can be easily used to halt the simulation.

Regards,
Kedar

kedarpapte@gmail.com

wrote:
> Hi All,
>
> Do we have any System Tasks and Function in VHDL similar to Verilog
> like $stop, $finish
>
> which can be easily used to halt the simulation.
>
Afaik, not explicitly.
But simulation is defined to halt when no events remain to simulate. I
put a control input on my testbench's main clock oscillator, which can
be asserted when I want to halt. With no further clock events, things
stop very quickly.

David R Brooks

<> skrev i en meddelelse
news: oups.com...
> Hi All,
>
> Do we have any System Tasks and Function in VHDL similar to Verilog
> like $stop, $finish
>
> which can be easily used to halt the simulation.
>

I use:

ASSERT false REPORT "Test complete";

Which is fairly non-intrusive (but don't get confused about the apparant
"error" in the log)

Thomas Thorsen

Thomas Thorsen wrote:

> I use:
> ASSERT false REPORT "Test complete";
>
> Which is fairly non-intrusive (but don't get confused about the apparant
> "error" in the log)

Just say :

REPORT "Test complete";

to eliminate the "error".

-- Mike Treseler

Mike Treseler

David R Brooks wrote:

> Afaik, not explicitly.
> But simulation is defined to halt when no events remain to simulate. I
> put a control input on my testbench's main clock oscillator, which can
> be asserted when I want to halt. With no further clock events, things
> stop very quickly.

I use "wait;"

--
Mark McDougall, Engineer
Virtual Logic Pty Ltd, <http://www.vl.com.au>
21-25 King St, Rockdale, 2216
Ph: +612-9599-3255 Fax: +612-9599-3266

Mark McDougall

>Do we have any System Tasks and >Function in VHDL similar to Verilog
>like $stop, $finish

Unfortunately not. The recommended way is, as other posters said, to
stop all events, i.e. stop all clocks and stimuli.

This is not always possible, expecially when the unit under test
contains vendor supplied PLL/DLL models which cannot be stopped and you
do not want to or cannot change the supplied VHDL code.

The mostly used way is to provoke an error by an ASSERT (VHDL'87) or
REPORT (VHDL'87, VHDL'93) statement with severity failure, which is
rather unpleasant.

Hubble.

Reiner Huober

Mike Treseler wrote:
> Thomas Thorsen wrote:
>
>> I use:
>> ASSERT false REPORT "Test complete";


Sorry, I totally missed the point.

I use a testbench done signal
to stop the clock:

if done_s then wait; end if; -- Stop clock

-- Mike Treseler

Mike Treseler

Kedar,
It will be in the Accellera VHDL-2006 revision.
Make sure to let your vendors know that you want
it implemented right away.

Cheers,
Jim

> Hi All,
>
> Do we have any System Tasks and Function in VHDL similar to Verilog
> like $stop, $finish
>
> which can be easily used to halt the simulation.
>
> Regards,
> Kedar
>


--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~
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Expert VHDL Training for Hardware Design and Verification
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Jim Lewis