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Saturday, May 15, 2021

How IR Drop will impact on Timing

 IR Drop

  • IR drop will occur due to the internal resistance, capacitance factors of the net . instance or cell may not get the sufficient voltage to drive the cell is called IR Drop
  • Due to IR Drop cell may not work properly because the cell didn't get the sufficient supply voltage
  • Due to this DROP the output of the cell may take lot of time to store the output of the that instance or cell it leads fail the timing
How It will impact on the timing:
  • Due to that Ir drop , cell output may take lot of time it leads to setup time violation 
Reasons:
  • Consider two flops are connected in cascade
  • Assume 1st Flop is launching flop and second flop is Capturing Flop
  • Due to the internal resistance and cap values the data can go slow in data path which means it may take time
  • When data path is slower than the clock path it leads to Setup time violation
  • IR drop will help to Hold time Violations
  • If IR drop is more in the clock path it may get both setup and hold violation

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