Free Electronic Lab

Opensource EDA software development, some thoughts about the EDA/Semiconductor industry and Mixed-signal integrated circuit design

Netgen: back on track


Following my mail on “Fedora Electronic Lab”, DenisLeroy got netgen back on track and it’s being reviewed. Hopefully, it may be on time for F8.

Netgen does LVS checks, i.e. it verifies the Layout against the Schematic. The layout is created with Magic while the Schematic with Xcircuit. Both Magic and Xcircuit includes the required mechanisms to extract netlists. Thus netgen can compares the netlists. The netlists could be either of sim or spice. I’ve explained both below.

Example of Usage:
This is a simple NOR i.e:

magic -d OGL nor.mag & xcircuit nor2.ps &
ext
ext2sim -R -C OR ext2spice -R -C
Netlists -> Write Sim OR Netlists -> Write Spice

$ netgen &

readnet sim nor
readnet sim nor2
lvs nor nor2
readnet spice nor
readnet spice nor2
lvs nor nor2

Result: Circuits match uniquely.
LVS Done.

“reinitialize” should be used to restart another LVS check

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One Response

  1. paul says:

    Does netgen keep the original device names in the Xcircuit file? Does it compare L and W?

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Chitlesh Goorah
Digital IC design engineer
Neuchâtel, Switzerland

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