[SI-LIST] setup & hold Time for source synchronous
- From: "Issa, Elie" <Elie.Issa@xxxxxxxxxx>
- To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 3 Aug 2001 11:26:04 -0500
Dear SI Gurus:
I need your help in verifying some derivation for setup & hold equations
for GTL bus
for source synchronous clocks.
The equation for setup is:
Tco(strobe)min + Tflight(strobe)min - Tco(data)max -Tflight(data)max
-Tsetup= Tmargin_setup
The equation for hold time was:
Tco(data)min + Tflight(data)min -Tco(strobe)max -Tflight(strobe)max
-Thold= Tmargin_hold
The skew for the strobe & data flight time should be very small. Whenever,
I fit the variable given in the
specs into the equation, the margin comes negative.
I would think that there must be a ValidBefore and ValidAfter variable to be
included in the equation.
Yet the specs claim the ValidBefore is only [Tco(strobe)min-- Tco(data)max].
Any input would be greatly appreciated!
Regards
Elie
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