[ibis-macro] Re: Today's presentations BIRD197.5-2 and DDR5_DQ_Write_Protocol_Overview

  • From: "Fangyi Rao" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "fangyi_rao" for DMARC)
  • To: "wkatz@xxxxxxxxxx" <wkatz@xxxxxxxxxx>, IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
  • Date: Mon, 7 Oct 2019 21:41:19 +0000

Hi Walter,

Regarding the following two statements in BIRD197.5-2,

"The Rx AMI_GetWave output waveform returned by the AMI model must be nominally 
centered around zero Volts" and
"The High/Low Threshold of Rx AMI_GetWave output waveform returned by the AMI 
model shall be zero Volts"

the NRZ eye is similar to the PAM center eye. In PAM4 we compare the center eye 
waveform with the CenterThreshold parameter to detect the symbol level. 
Similarly in the future for NRZ we could potentially introduce a threshold 
parameter instead of using a fixed threshold of 0 V. In that regard, the first 
statement is more consistent with the PAM4 center eye approach than the second 
one is.

Regards,
Fangyi

From: ibis-macro-bounce@xxxxxxxxxxxxx <ibis-macro-bounce@xxxxxxxxxxxxx> On 
Behalf Of Walter Katz
Sent: Tuesday, October 01, 2019 1:29 PM
To: IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
Subject: [ibis-macro] Today's presentations BIRD197.5-2 and 
DDR5_DQ_Write_Protocol_Overview


[EXTERNAL]
BIRD 197.5-2 with comments added today.

DDR5_DQ_Write_Protocol_Overview with slides added to describe who and where 
training/optimization can be done.

Walter

Walter Katz
wkatz@xxxxxxxxxx<mailto:wkatz@xxxxxxxxxx>
Office 978.461-0449 x 133
Mobile  720.417-3762
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