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Multi Supply Voltage tip of the week

Are you taping out in a non-CPF Encounter flow and want to know how to control adding addIsolationCell to isolate some signals with isolate high cells and some with isolate low cells? Then here is the answer of how to do it.

Basically you can use "–excNet/-nexNetFile" and "–selNet/-selNetFile" options of "addIsolation" command to achieve what you want:

addIsolation

[-excNet netName]

[-excNetFile fileName]

[-prefix prefix]

[-forceIsoCellInPDHInst | -noForceIsoCellInPDHinst]

[-noFTermIsoCell]

[-selNet netName]

[-selNetFile fileName]

Example: only net1 and net2 from PD1 to PD2 need clamp low (assume you have two types of isolation cells, iso_high is clamp-high and iso_low is clamp-low)

prepare shifter table “tbl-high”, assign iso_high for PD1 to PD2
loadShifter –infile tbl-high
prepare file “clamp-low.nets” which contains net1 and net2
addIsolation –excNetFile clamp-low.nets
prepare shifter table “tbl-low”, assign iso-low for PD1 to PD2
loadShifter –infile tbl-low
addIsolation –selNetFile clamp-low.nets

Sundar

Originally posted in cdnusers.org by sundar_shanmugam

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