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Hardware interview practice

First response to a macro-channel hotspot

EasyPhysical DesignSystemVerilog

Early placement shows severe routing congestion in a narrow channel between two large SRAM macros, while utilization elsewhere is moderate. What is the best first physical-design action?

Choose one

Answer choices

  1. A. Insert many repeaters into the congested channel before changing the floorplan.
  2. B. Increase global utilization so unused areas become as dense as the hotspot.
  3. C. Ignore the hotspot until signoff routing because early congestion maps contain no useful information.
  4. D. Adjust macro placement or spacing to open the channel, then rerun placement and congestion analysis.
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