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How can I cut a routing blockage in FE?

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Dear ALL:

I want to cut a routing blockage in one floorplan to make routing guides. For example, I dont have M5 cell routing blockage in a LEF hard block, I add this routing blockage at the top level, I have to cut some notches according to the pin shapes (if pins are on M5), then router can make M5 connections to these pins without DRC. How can I cut these notches on the added M5 routing blockage, this is more like a polygon operation, do Encounter have such db commands? I dont want to modify the LEF file (to add the M5 obstruction).

Thanks in advance!


Originally posted in cdnusers.org by eminemshow
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  • Hi Bob,

    I will move to 10.1 after completing this design.

    In this design, I prefer not incorporate the blockage inside the LEF as I still allow power routing over the macro in the floorplan. So, it is nice to be able to generate those blockage on the fly and delete before checking for violation.

    I am currently using this : foreach inst [dbGet [dbGet -p2 top.insts.cell.baseClass block].name] {createRouteBlk -cover -exceptpgnet -layer 5  -inst $inst}

    layer 5 is my top metal.    That covers the macro.  That is already doing a good job. The sizing would have also allow access in the top metal to the pins. But not an issue for this design.

    Thanks a lot for your answer.

    Patrice

Reply

  • Hi Bob,

    I will move to 10.1 after completing this design.

    In this design, I prefer not incorporate the blockage inside the LEF as I still allow power routing over the macro in the floorplan. So, it is nice to be able to generate those blockage on the fly and delete before checking for violation.

    I am currently using this : foreach inst [dbGet [dbGet -p2 top.insts.cell.baseClass block].name] {createRouteBlk -cover -exceptpgnet -layer 5  -inst $inst}

    layer 5 is my top metal.    That covers the macro.  That is already doing a good job. The sizing would have also allow access in the top metal to the pins. But not an issue for this design.

    Thanks a lot for your answer.

    Patrice

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