Hex files in simulation

Hi,

in my simulation I have a dual port Ram (from QuartusII v.5.0) which is
initialized to all zeros with a hex file.

My problem:

After some write operations into the RAM (32 write positions
are provided by a FIFO module) I want to reset my design in my
VHDL simulation (Modelsim) because the FIFO is empty. The present
state of design does not allow to put back the write positions
into my FIFO.

After the FIFO is empty I could reset my design within my testbench.
But the contents of the RAM should also be resetted or rather
be initialized again with zeros. I could step through my RAM
and write at each address zeros into it but that takes too long
for simulation. The hex file seems to have a bearing on initialization
only at the beginning of the simulation.

Is there some possibility to initialize the RAM during simulation
by means of the hex file ?

Any suggestions are appreciated.

Rgds
André

ALuPin@web.de

wrote:


> After the FIFO is empty I could reset my design within my testbench.

Yes, just push more data in using the testbench.

> But the contents of the RAM should also be resetted or rather
> be initialized again with zeros.

That's not what will happen on the bench.
A fifo can only access data it has pushed in.
You want 'U's elsewhere to make sure your
head and tail counters are working ok.

-- Mike Treseler

Mike Treseler

Hi Mike,

thank you for your answer.
In a later stage of the design the read positions of the RAM will be
pushed
back into the FIFO
whereas the corresponding entry in the RAM will be cleared that is
filled with zeros.

But right now I want to perform more functional test sequences with
regard
to writing positions in the RAM. But since there are only 32
"positions"
available I'd need to reset the content of the RAM after 32 write
actions
into it.

Rgds
André

Mike Treseler schrieb:
> wrote:
>
>
> > After the FIFO is empty I could reset my design within my testbench.
>
> Yes, just push more data in using the testbench.
>
> > But the contents of the RAM should also be resetted or rather
> > be initialized again with zeros.
>
> That's not what will happen on the bench.
> A fifo can only access data it has pushed in.
> You want 'U's elsewhere to make sure your
> head and tail counters are working ok.
>
> -- Mike Treseler

ALuPin@web.de

Any further suggestions ?

Rgds
André

ALuPin@web.de