11 Dec
2001
11 Dec
'01
8:54 p.m.
On December 11, jpero(a)sympatico.ca wrote:
That rate, if Sridhar is looking at sub 5ns pin-pin,
he's looking
at around 50 to 100MHz. Just my SWAG. FYI: PII 233 has 7ns
sync-sram cycling at 133MHz.
If true, that would be blisteringly fast PDP11/70 on size of a small
12" x 12" board roughly.
That means putting in certain lengths of critcial traces to get
timing come together at right moment (hence the zig-zag traces), low
voltage swings, 2 levels of caches, etc.
Blatent easy way out is emulate that 11/70 on athlon XP 1900+. :-)
Smack me if you dare. :-)
Oh, puh-YUKE!!
-Dave
--
Dave McGuire
St. Petersburg, FL