Re: [f-cpu] Register Bank

[nicO <nicolas.boulay@ifrance.com>]

Michael Riepe a écrit :
> 
> On Thu, Aug 02, 2001 at 10:09:11PM +0200, turlututu@bechamail.com wrote:
> [...]
> >       Some vendors (ST micro, IBM, Atmel, ...) seem to dislike
> > asynchronous resets in designs. They strongly prefer synchronous
> > resets. Resets are managed in a unique module but we have to modify
> > sequential processes; the original code is :
> [...]
> 
> >       Note that the use of a constant for the reset value is the best way
> > because you don\'t always know if the reset is active high or low before the
> > choice of a vendor.
> >       Do not forget that a majority of vendors do not support tri-states
> > ( \'Z\' ) in the core of a design, so we have to replace them with muxes.
> 
> This is only a case study, not the real code.
> 
> On the other hand, coding hints are welcome.  Thank you :)
> 
> >       Could somebody tell me why there are
> > \"Write_0, Write_1, Write_Enable_0, Write_Enable_1\"
> > signals in the sensitivity list ?
> 
> Because some tools complain if they're not present.  I don't know why;
> as far as I understood, only Clk is needed in a sequential circuit with
> no asynchronous controls (which you just confirmed, somehow).
> 

It's worst than that. This contrôl signal shoudn't be there, other wise
it wasn't a 'true' synchronous circuit.

nicO

> --
>  Michael "Tired" Riepe <Michael.Riepe@stud.uni-hannover.de>
>  "All I wanna do is have a little fun before I die"
> *************************************************************
> To unsubscribe, send an e-mail to majordomo@seul.org with
> unsubscribe f-cpu       in the body. http://f-cpu.seul.org/
*************************************************************
To unsubscribe, send an e-mail to majordomo@seul.org with
unsubscribe f-cpu       in the body. http://f-cpu.seul.org/