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Politics : Formerly About Advanced Micro Devices
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To: Elmer who wrote (51773)3/7/1999 12:53:00 PM
From: Ali Chen  Read Replies (2) of 1572590
 
Elmer, <I was correcting Ali's misunderstanding of basic design principles. I might add though that a latch is a sequential element as well as a Flip-Flop.>
You can gospel your "definitions" as many times
as you want, but it is quite apparent that
the most important thing in timing analysis
has clearly escaped your comprehension.

For the final design it does not really
matter which part of logic is officially
called "sequential" and which is "combinatorial".
The fact remains that the critical path
in a pipeline stage consist of certain
number of gates through which the signal
is propagating SEQUENTIALLY before getting
latched in the next stage. That is what
I meant under "sequential" logic. Sorry
if your "educational" paradigm is so
inflexible that you fail so see the
true meaning of words behind terminological
monikers. If you are so proficient in
"basic gesign proinciples", the whole
issue of pipeline timing must be clear
for you. Otherwise it is your
misunderstanding, so you need to thank me
(you formally did:) :) for clarifications.

If you want more, I feel that insertion
of latches to split some too complicated
combinatorial logic is exactly the technique
behind the "superpipelining". The "stage" of
pipeline is the combinatorial logic between
your "sequential" latches. The worst case delay
in that logic determines exactly how fast
the design can work. Does it clear YOUR
MISUNDERRSTANDING for now or you pefer
to continue terminological nit-picking?

BTW, the "latch" is a variant of "flip-flop".
Just for the sake of terminological clarity:)
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