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Innovus hold-time optimization in the presence of synchronizers

Innovus somehow detects FF synchronizers in the circuit (which is good) and disables InPlaceOptimization of synchronizer nets. However, it seems that negative hold time slacks of non-optimized nodes prevent to meet the desired hold time slack in the rest of the circuit. My project is based on 180 nm technology and I target 0.2 ns hold time slack. In the presence of synchronizer nets with ~ -0.2 ns hold time slack, the best positive hold time slack after 'opt_design -post_route -setup -hold' is reported in the range of 0.03 ns.

Are there any suggestions how to implement circuits with synchronizers ?

Is there any way to exclude disabled nets from the optimization ?

dusan.raic@fe.uni-lj.si

raic.dusan@gmail.com

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Dimo M over 4 years ago

Hi Dusan,

you can try to separate the timing paths ending at these synchronizers into a separate path group to guide the optimizer.

Please refer to this article for further information about path groups and optimization: Using the path groups for timing analysis and optimization

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Dimo
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DusanR over 4 years ago in reply to Dimo M

Thanks a lot !
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DusanR over 4 years ago in reply to Dimo M

Thanks a lot !
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