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devices parameters are changed are cdb2oa conversion

vdsv

Hi, i have converted a library from cdb2oa and there is a weird issue.

Devices that are standalone, do not have any multiplier defined are not affected and the layout views are not blown up.

However, devices that have multiplier defined have their parameters changed. For e.g.: device with multiplier 3 now appears as a device with length 3x of original but multiplier as 1.

Also, devices in series (or stacked devices) are merged in certain layouts.

Any insights with this issue will be valuable.

Thanks a lot.

Parents
  • vdsv
    Thank you Andrew. It is could mostly likely be an issue with the PDK. This is 0.5 um process. During CDB2OA migration, i turned on "Retain CDB parameters" and "Use defaults from CDF". I copied CDF parameters from pcells in older pdk to pcells in new pdk. Then i also tried modifying CDF parameters of new cells and add the "mult" parameter again. Looks like, this could also be due to the way multiple pcells are instanced in IC5.1x and IC6.1. It could as well be that the multiple instances are now instanced using <N:1> and not [N:1] and IC6.1 therefore creates a much bigger device as it cannot handle the old multiplier, or the way it is specified. After all these experiments, i am fixing the layout manually and halt the root cause analysis of CDB2OA changing device dimensions. Thank You for the response. Best Regards, Vandana
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  • vdsv
    Thank you Andrew. It is could mostly likely be an issue with the PDK. This is 0.5 um process. During CDB2OA migration, i turned on "Retain CDB parameters" and "Use defaults from CDF". I copied CDF parameters from pcells in older pdk to pcells in new pdk. Then i also tried modifying CDF parameters of new cells and add the "mult" parameter again. Looks like, this could also be due to the way multiple pcells are instanced in IC5.1x and IC6.1. It could as well be that the multiple instances are now instanced using <N:1> and not [N:1] and IC6.1 therefore creates a much bigger device as it cannot handle the old multiplier, or the way it is specified. After all these experiments, i am fixing the layout manually and halt the root cause analysis of CDB2OA changing device dimensions. Thank You for the response. Best Regards, Vandana
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