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Find a list of floating gates in schematic

pham777

Hi,

I wonder if there is a skill code to find hierarchily a list of transistors which have its gate

1) not connected to power/ground

2) and not connected to other devices(transistors, R,L,C)

I am using cadence IC615.

Thanks a lot,

HP

Parents

  • Hi HP

    I think it can be done by examining the net info of each transistor hierarchically. But this is an ERC (Electrical Rule Check) problem which should be resolved using an LVS tool. Using SKILL is definitely not the most efficient approach. The problem can be resolved using Assura or PVS as follows:

    === Assura ===
    ercPathCheck(noPwr or noGnd "No pwr/gnd connection")
    ercCheckFloatingDevices(mosSourceOrDrain)

    === PVS ===
    erc_pathcheck -power not -or -ground not
    lvs_filter_option AE
    lvs_report_option -filtered_devices

    Check "design.cfr" file in the PVS LVS run directory for a list of floating mos devices which have been filtered.


    Best regards
    Quek

Reply

  • Hi HP

    I think it can be done by examining the net info of each transistor hierarchically. But this is an ERC (Electrical Rule Check) problem which should be resolved using an LVS tool. Using SKILL is definitely not the most efficient approach. The problem can be resolved using Assura or PVS as follows:

    === Assura ===
    ercPathCheck(noPwr or noGnd "No pwr/gnd connection")
    ercCheckFloatingDevices(mosSourceOrDrain)

    === PVS ===
    erc_pathcheck -power not -or -ground not
    lvs_filter_option AE
    lvs_report_option -filtered_devices

    Check "design.cfr" file in the PVS LVS run directory for a list of floating mos devices which have been filtered.


    Best regards
    Quek

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