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Assymmetry of setup and hold times

To: "'Jscquake@xxxxxxx'" <Jscquake@xxxxxxx>, stds-802-3-hssg@xxxxxxxx
Subject: Assymmetry of setup and hold times
From: Tom Alexander <Tom_Alexander@xxxxxxxxxxxxxx>
Date: Mon, 26 Feb 2001 14:29:02 -0800
Cc: Graeme Boyd <graeme_boyd@xxxxxxxxxxxxxxxx>
Sender: owner-stds-802-3-hssg@xxxxxxxx

Hi, Justin,

It appears that Clause 51 D2.1 specifies assymmetrical setup/hold times for the PMA
input timing (see Table 51.4) vs the PMA client input timing (see Table 51.8). For one

case it is 250 ps, while in the other case it is 300 ps. Is there some reason behind this?

This seems to depart from the OIF SFI-4 spec. (Apologies in advance in case I have

inadvertently raked up any heated discussions.)

Best regards,

- Tom Alexander

PMC-Sierra, Inc.

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