[ibis-macro] Re: latest version of clock forwarding BIRD

From: "Fangyi Rao" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "fangyi_rao" for DMARC)
To: "wkatz@xxxxxxxxxx" <wkatz@xxxxxxxxxx>, 'IBIS-ATM' <ibis-macro@xxxxxxxxxxxxx>
Date: Tue, 17 Mar 2020 23:41:38 +0000

Walter,

Regarding "Are the times that the DQS samples the DQ latch a function of the DQ
waveform at the latch? Another way of saying this is if a DQS is latching
several different DQ, does is sample them all at the same time?",

The answer is not necessarily. Each DQ Rx model can internally add a delay to
the DQS input waveform before DQS is used to latch the DQ waveform. This delay
can depend on the DQ index (e.g. DQ0, DQ1, etc.), which is an Usage In model
parameter defined by the DQ Rx model developer.

Fangyi

From: ibis-macro-bounce@xxxxxxxxxxxxx <ibis-macro-bounce@xxxxxxxxxxxxx> On
Behalf Of Walter Katz
Sent: Tuesday, March 17, 2020 4:06 PM
To: 'IBIS-ATM' <ibis-macro@xxxxxxxxxxxxx>
Subject: [ibis-macro] Re: latest version of clock forwarding BIRD

[EXTERNAL]
Fangyi,

Another question about the DQS and DQ paths inside of the DQ.

It is clear that the operation of the DQ data path is a function of the DQS
signal (the DQ DFE needs to know when it is sampled to know when to apply the
DFE coefficient).

My question is about the DQS data path. Are the times that the DQS samples the
DQ latch a function of the DQ waveform at the latch? Another way of saying this
is if a DQS is latching several different DQ, does is sample them all at the
same time?

Walter

Walter Katz
wkatz@xxxxxxxxxx<mailto:wkatz@xxxxxxxxxx>
Office 978.461-0449 x 133
Mobile 720.417-3762
[cid:image001.jpg@01D5FC79.34411320]

From: ibis-macro-bounce@xxxxxxxxxxxxx<mailto:ibis-macro-bounce@xxxxxxxxxxxxx>
<ibis-macro-bounce@xxxxxxxxxxxxx<mailto:ibis-macro-bounce@xxxxxxxxxxxxx>> On
Behalf Of Fangyi Rao (Redacted sender "fangyi_rao" for DMARC)
Sent: Tuesday, March 17, 2020 3:34 PM
To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx<mailto:ibis-macro@xxxxxxxxxxxxx>>
Subject: [ibis-macro] latest version of clock forwarding BIRD

Hi All,

Please find in the attachment the latest version of the clock forwarding BIRD
with updates discussed at today's ATM.

Steve (Parker): please upload it to the ATM website.

Thanks,
Fangyi

References:
- [ibis-macro] latest version of clock forwarding BIRD
  - From: Fangyi Rao
- [ibis-macro] Re: latest version of clock forwarding BIRD
  - From: Walter Katz

[ibis-macro] Re: latest version of clock forwarding BIRD

Other related posts: