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Message
From: Mike Wiles <mwiles@a...>
Date: Wed, 20 Aug 2003 08:36:39 -0500
Subject: Re: [openrisc] OR1KSIM is it cycle accurate
Damjan,
Thanks for the update. This is exactly what I want to do.
I want to model the core, plus cache and memory latency.
Thanks for you inputs...
Mikew
At 03:21 PM 08/20/2003 +0200, you wrote:
>Mike,
>
>there are some features that allow modelling of system for benchmark
>purposes. To benchmark is not enough to model only the processor but also
>memory latency etc (memory and memory controller etc). You can set what are
>delays of accessing caches, MMUs delays, delay of memory controller and
>memories etc. But this is only to about 95% accurate. For 100% you would
>have to model instruction interdependency by implementing exact model of
>implementation pipeline (for example or1200 pipeline would have to be
>implemented). Right now there is a feature that will allow you to model the
>pipeline from somewhat high level point of view - for example you can model
>interdependcy of instructions to some level. For example a load instruction
>followed by an add instruction, the simulator will delay execution of add
>until load is completed. For architectual tradeofs you can also set how many
>"execution units" you have, so effectively you could model a superscalar
>processor, setting for example to have 2 load/store units, 3 ALU units etc.
>The latter needs to be set in execute.c (I don't remember the exact file).
>
>regards,
>Damjan
>
>
>----- Original Message -----
>From: "Mike Wiles" <mwiles@a...>
>To: <openrisc@o...>
>Sent: Wednesday, August 20, 2003 3:04 PM
>Subject: Re: [openrisc] OR1KSIM is it cycle accurate
>
>
> > If you want to do benchmarks or architectural tradeoffs
> > you need a cycle accurate simulator.
> >
> > Thanks, Mikew
> >
> > At 08:03 AM 08/20/2003 +0200, you wrote:
> >
> > >On Tuesday 19 August 2003 17:08, mwiles@a... wrote:
> > > > Hi,
> > > > Can you tell me if the OR1KSIM is a cycle accurate simualtor?
> > >No, but why would you need cycle accurate sim anyway?
> > >
> > >Marko
> > >
> > >
> > >
> > >
> > >
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>
>
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