Re: [openrisc] OR1KSIM is it cycle accurate

["Damjan Lampret" <lampret@opencores.org>]

Memory timing and cache timing can be set in the simulator .cfg file.
Instruction inderdependency needs to be enabled in the .cfg file and then
manual set how instructions influence each other. But default is close to
or1200.

regards,
Damjan

----- Original Message ----- 
From: "Mike Wiles" <mwiles@austin.rr.com>
To: <openrisc@opencores.org>
Sent: Wednesday, August 20, 2003 3:36 PM
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@austin.rr.com>
> >To: <openrisc@opencores.org>
> >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@austin.rr.com 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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