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detailRoute vs trialRoute

Rajesh Vembu

Is there a way to report the differences/ratio of detail route vs trialroute net wirelengths?

Currently reportWire command reports the ratio of detailRoute vs half-perimeter net wirelengths. However, if trialRoute statistics were also included in this, it would be great.

 Are the net lengths stored as part of the net object in encounter? 

Parents

  •  Bob,

    Thanks for the script.The only limitation in the script is that trialRoute and detailRoute wirelengths have to be computed in a different databases.If the netlength information is stored as part of net object, we can query it easily.

    Here are some reasons, i feel, why we should have a trialRoute vs detailRoute comparison

    1. In case of multi-fanout nets half-perimeter lengths are way-off compared to the detail route. Trial route might be a good indicator as it is based on steiner route.

    2. Since all the optimizations are based on trialRoute information, it would make sense to have a correlation between trialRoute and detailRoute readily available.

    3. Does layer assignment happen while calculating half-perimeter net lengths?

    If net lengths are not stored as part of net object, does it mean reportWire calculates the wirelength (both detail and half-perimeter) everytime it is invoked. For a larger design with millions of nets this could have a big runtime hit.

     

Reply

  •  Bob,

    Thanks for the script.The only limitation in the script is that trialRoute and detailRoute wirelengths have to be computed in a different databases.If the netlength information is stored as part of net object, we can query it easily.

    Here are some reasons, i feel, why we should have a trialRoute vs detailRoute comparison

    1. In case of multi-fanout nets half-perimeter lengths are way-off compared to the detail route. Trial route might be a good indicator as it is based on steiner route.

    2. Since all the optimizations are based on trialRoute information, it would make sense to have a correlation between trialRoute and detailRoute readily available.

    3. Does layer assignment happen while calculating half-perimeter net lengths?

    If net lengths are not stored as part of net object, does it mean reportWire calculates the wirelength (both detail and half-perimeter) everytime it is invoked. For a larger design with millions of nets this could have a big runtime hit.

     

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