( ESNUG 218 Item 1 ) ---------------------------------------------- [5/19/95]
From: danj@mpd.tandem.com (Dan Joyce)
Subject: Rules Of Thumb For IKOS Runs
John,
The time for an IKOS run is a function of:
(# of gates in ASIC) X (# of vectors) X (# of faults)
Because the size of many ASIC's are 100k+ gates, the person running IKOS
has to target his runs to a small subset of vectors that are trying to
test a small subset of faults. This piecemeal approach was the only way
IKOS run times can be minimized. (As it is, it's not unusual to have IKOS
runs that last a week. If either your IKOS box or your workstation
connected to it has a power failure or a system reboot during the run, you
lose a weeks worth of work!) An additional factor that slows things
down is using timing-mode IKOS RAM models; these models run about 6X
slower than functional-mode RAM models.
- Dan Joyce
Tandem Computers
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