Re: [fpu] Current progress

[Jamil Khatib <jamilkhatib75@yahoo.com>]

Usef Saiful-Ulum wrote:

> On Wed, 12 Apr 2000, Jamil Khatib wrote:
>
> > Regarding some information,
> > I updated the FPU page in opencores site you can check for some links
> > I want to add a link for the x86 architecture http://www.x86.org we can find
> > some information about the coprocssor.
> >
> > Where can I find the OR1K interface for the FPU.
>
> I think this is still under development, so actually we can define the
> coprocessor interface. What have been specified is 16x64-bit FPR.

Do you mean that the registers are located in OR1k core?

>
> > I think we can should be able
> > to build this FPU to be able to run as a stand alone core and so to be plugged
> > to any other processor. what do you think?
>
> if we want to develop a stand alone core we should avoid "bus watching"
> mechanism (ARM style) because the coprocessor should not be attached to
> OR1K native bus. I'm not sure what was the main advantage of having this
> processor-independent FPU core since otherwise, in my opinion, it would
> simplify the design of the portion of the interface and fasten the
> coprocessor-register transfer instruction.
>

Why do not we design two versions?
Do you think about any application that may need only floating point processor?
may be the stand alone FPU can be plugged to any system that needs to get some FPU
operations only to enhance its system performance.


>
> If we want to optimized for speed of FP operation then I think we should
> develop a parallel pipelined FPU, AMD K7 using this style. Or maybe you
> have other ideas to raise the FPU performance?
>

For now I do not have any idea how can we increase the performance.

Currently I am checking the old i387SX coprocessor.
I think for now we have to list all possible floating point instruction "both
software and hardware"

>
> Best regards,
>
> Usef


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