> Van: Tom Handley <thandley@TELEPORT.COM>
> Aan: PICLIST@MITVMA.MIT.EDU
> Onderwerp: Re: Circular Buffer Help
> Datum: woensdag 29 april 1998 0:10

Hello Tom,

>    Rudy, I really should have posted this in my PIC-based Logic Analyzer
> topic so it would have been easier to see where I was comming from.

Ah, I have to confess : I do not read every article that is posted ...
)-: It would take to much time ... :-(

>    The host sends the delay count to the analyzer as part of the sample
> request so it already knows the delay. Once `armed' the analyzer records
> data in the circular buffer until a trigger event. Then a delay counter
> is started. At the end of that count, the address counter clock is
> disabled and the capture mode is complete. The host can monitor this.

That is as much as I thought.  Good to know we are talking about the same
method of operation !

> I like your suggestion of clocking in 32K and then subracting the delay.
> Last night I did another update to that particular CPLD and I was able to
> eliminate 1 74x-family `glue' chip while retaining the capability to read
> the absolute address. At this point, eliminating the address read-back
> will not save anything so I'll keep it.
>
>    - Tom

Ehh .. Tom, something keeps nagging me :  Why do you need to be able
to read the absolute adres of the Sample-buffer ?  As you've seen, you
don't
really need it (anymore).

Greetz,
  Rudy Wieser