Re: Comment on D2.0 Clause 51, Table 51-6 - magnitude of TD
In a message dated 12/8/00 3:46:40 AM Pacific Standard Time,
dartnell@nortelnetworks.com writes:
> This message for Justin Chang.
>
> Justin,
>
> I see you have added a note in draft 2.0 pointing out that the value of TD
-
> the variation of PMA_TXCLK_SRC to PMA_TXCLK delay - is possibly too large
at
> 30ns. As we discussed at the Tampa meeting, I would still like to
understand
> reason why TD was originally proposed to be as large as 30ns. TXCLK_SRC is
> used to clock the 16 bit parallel data out of the PCS, together with the
> TXCLK. It should be possible for this delay variation to be very small - a
> few ns at the most. I still believe that most Serdes vendors will have
> trouble meeting a value as large as 30ns. I am intending to propose a much
> smaller value in my ballot comment, but would appreciate some initial
> discussion too confirm the rationale. Would a conference call be valuable?
>
> Peter
>
Hello Peter,
I am quite in agreement that we can reduce this number. The question is what
to reduce it to. I have inputs from our engr team on this ... see my earlier
msg onto the reflector but I am open for more specifics. I will set up a
conference
call to those interested.
All,
For any and all interested in having a conference call
on this. Let me know your availability. I would like to set this call to be
Tuesday, Dec 12 sometime ... tentatively 11AM PST time, 2PM EST for one
hour.
Regards,
Justin Chang
Quake Technologies, Inc.
50 Airport Parkway, San Jose, CA. 95110
Tel: 408-437-7723 email: justin@quaketech.com
Fax: 408-437-4923 internet: www.quaketech.com