[SI-LIST] Re: setup & hold Time for source synchronous
- From: "Lai, Ricky (Eng Hou)" <Ricky.Lai@xxxxxxxxxx>
- To: "Issa, Elie" <Elie.Issa@xxxxxxxxxx>,"'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 3 Aug 2001 13:43:30 -0500
The correct equation should be:
Setup margin = Budget - (T_data_valid_before_stb_min) - (Tflight_skew_max) -
Tsetup
Hold margin = Budget - (T_data_valid_after_stb_min) - (Tflight_skew_max) -
Thold
-----Original Message-----
From: Issa, Elie
Sent: Friday, August 03, 2001 11:26 AM
To: 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] setup & hold Time for source synchronous
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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