Re: Assymmetry of setup and hold times
In a message dated 2/26/01 2:26:27 PM Pacific Standard Time,
It appears that Clause 51 D2.1 specifies assymmetrical setup/hold times for
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
inadvertently raked up any heated discussions.)
- Tom Alexander
No heated discussions (I think) ... prior discussions was based on the
thinking that the PMA had better technology and could deal w/ smaller setup
and hold allowing the PMA client would be freedom for more setup and hold. I
say that given CMOS progress that we can make both symetrical and go for
the smaller 250ns setup. Allows more room for board and system budget.
This is something we can change for next time, TC on rev 2.2
Quake Technologies, Inc.
2880 Zanker Road, Suite 104
San Jose, CA 95134
Tel: 408-922-6888 x108