gf180mcuC M5 1 says 0 28um KLayout DRC checks

Question

< Tim Edwards> gf180mcuC M5 1 says 0 28um KLayout DRC checks for 0 28um but magic checks for 0 36um

Tim Edwards · Answer

Metal 5 is top level metal at 9KAngstrom thickness 0 9um so the rule that needs to be applied is MT 1 not M5 1

Philipp Gühring · Answer

True then we need to fix the KLayout DRC which likely uncovers more issues in other projects too

Philipp Gühring · Answer

But 9K and the nowadays necessary 11K needs 0 44um according to the MT 1 documentation with the asterisk

Philipp Gühring · Answer

So it seems that both KLayout and magic were wrong

Farag Elsayed · Answer

< Amro Tork> Should we exclude top metal from Mn table rules and check it only in MT DRC table For example 5LM gt Mn table for M1 M4 amp MT table for M5 4LM gt Mn table for M1 M3 amp MT table for M4 and so on

Tim Edwards · Answer

That would be preferred I assume that since the thick metal rules are more conservative that it is not incorrect to run both decks on M5 but it certainly is wasting compute cycles Plus if a violation is bad enough to break both sets of rules then the end user is going to be confronted with two different results for the same error which will be confusing

Amro Tork · Answer