ESDIO1 133 0 DRC mark layer for XXXX I/O ESD protection devices and circuits identification .This layer should cover XXXX IO ESD transistors.
ESDHV 133 1 DRC dummy layer for hign voltage tolerate stacked NMOS.
ESDIO2 133 3 DRC mark layer for I/O ESD protection devices and circuits identification.This layer should cover ESD transittors and their N and P guard rings,but non-ESD transistors inside the same guard ring should be excluded,otherwise all the devices and circuits inside ESDIO2 will be regarded as ESD transistors and may induce false DRC alarm.