Modelsim resulution info

Hi all,

My query is about Modelsim simulation,..
If we run any simulation under the defined resultions time it takes
some time to finish the simulation.
What i want is is there any equation to calculate the time period or
days, if i increase the simulation time to 1 sec or more?

Please give exposure on this knowledge!

Sreeni
Moog,Inc

JSreeniv

On 15 Jun., 06:01, JSreeniv <sreenivas.jyo...@gmail.com> wrote:
> Hi all,
>
> My query is about Modelsim simulation,..
> If we run any simulation under the defined resultions time it takes
> some time to finish the simulation.
> What i want is is there any equation to calculate the time period or
> days, if i increase the simulation time to 1 sec or more?
>
> Please give exposure on this knowledge!
>
> Sreeni
> Moog,Inc

Hi Sreeni,
if your simulated circuit performs repetitive tasks (e.g. video
applications) you can multiply the time used for one picture by N to
estimate the simulation time for N pictures.
As always there's some limitation. If your circuit activates
additional modules based on special conditions, your calculation will
fail. Extra logic to simulate = extra transitions to calculate =
increasing simulation time.

From my experience: I calculated the time for some picture frames to
be a few days, but based on the simulation time before synchronisation
lock. After synchronisation the DDR-module was activated. This slowed
down simulation speed drastically. A recalculation based on the new
simulation speed resulted in a new overall simulation times of half a
month.

So that's the variation of results you can have if it goes bad. But if
you have enough knowledge about your design you can minimize such
errors.

Have a nice simulation.
Eilert

backhus

JSreeniv wrote:

> If we run any simulation under the defined resultions time it takes
> some time to finish the simulation.
> What i want is is there any equation to calculate the time period or
> days, if i increase the simulation time to 1 sec or more?

Maybe you mean a resolution time of less than 1 nS?
That can increase the simulation time.
So can the use of asynchronous processes.

> Please give exposure on this knowledge!

Try a simple example and see for yourself.

-- Mike Treseler

Mike Treseler