[SI-LIST] measuring active-to-float time for PCI o/p buffer
- From: adeel.ahmad@xxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 7 Apr 2003 17:36:56 +0530
hello all,
my question relates to measuring Output disable time(active-to-float time
Toff) time for a PCI/PCI-X output buffer.
the PCI-X rev1.0 states that for active/float timing measurements-
"the 'off' state is defined to be when the total current delivered
through the component pin is less than or equal to the leakage current
specification"
the dc spec gives max. Input leakage current=+/-10uA.
and ac spec gives max Toff=7ns
My question is-
1. Why is tristate delay measured using Input leakage current?
2. If anyone has measured tristate delays for PCI output buffer(using
simulations), then how?
3. What characterization load,if any, do i take?
any enlightment on this issue will be appreciated.
regards
ADEEL AHMAD
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