UPF: What is isolation sense in isolation strategy?

set_isolation <isolation strategy name> \
-domain <domain name> \
-isolation_power_net <VDD> \
-isolation_ground_net <VSS> \
-clamp_value 1 \
-elements { .. }

set_isolation_control <isolation strategy name> \
-domain <domain name> \
-location <self/parent> \
-isolation_signal <isolation signal> \
-isolation_sense <low/high>

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swabhi812 said:

Thanks for your response. Few clarifying questions:

1. Does clamp value only tell the tool to choose which kind of gate to use?
2. Let's say clamp value is 0, hence, I believe AND gate will be used as isolation cell. I guess when isolation signal is inactive (should be 1 in this case), this AND gate will act as a buffer, but when it is active (should be 0, same as clamp value), output of isolation cell will be 0. Is this correct?
3. How does isolation sense fits here? If #2 is correct, based on clamp value only we can decide if isolation signal can be high or low.

PS: I was not able to find a detailed circuit of an isolation cell, hence, I have these questions.

Thanks,
Abhishek

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