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First Encounter pin placement/layer

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Hi there,

can anyone tell me how to make Encounter place pins on restricted layers, for example on metals 1 & 2 only. Ultimately i'd like my pins placed on a given boundary edge & in a pre-determined order.

Thanks

Stu

p.s I'm actually an alaog layout guy using Encounter (for the first time) to place and route a large digital block in an analog chip. Apologies for the simple Q's, there will be more.


Originally posted in cdnusers.org by sreilly
Parents

  •  Hi Kul,

    As for hold opting - if congestion is causing a problem, try using cell padding starting before placement. You can set a cell padding for your flops the size of a buffer that can get added during hold opt. That way there will be a spot by your sinks to add the buffer.  Check out the command specifyCellPad in the docs. Just before you do your hold opt, remove the padding (so the buffers will be allowed to be placed in the spaces) with deleteAllCellPad.

     Also, report your hold timing before you do the hold opt. What kinds of violations do you see? Sometimes clock balancing is an issue. In those cases, adjusting the clocks slightly can fix thousands of holds without any buffers.

     Hope that helps,

    - Kari 

Reply

  •  Hi Kul,

    As for hold opting - if congestion is causing a problem, try using cell padding starting before placement. You can set a cell padding for your flops the size of a buffer that can get added during hold opt. That way there will be a spot by your sinks to add the buffer.  Check out the command specifyCellPad in the docs. Just before you do your hold opt, remove the padding (so the buffers will be allowed to be placed in the spaces) with deleteAllCellPad.

     Also, report your hold timing before you do the hold opt. What kinds of violations do you see? Sometimes clock balancing is an issue. In those cases, adjusting the clocks slightly can fix thousands of holds without any buffers.

     Hope that helps,

    - Kari 

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