Unknow Timing Arc in Innovus Post-Route Timing Report

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Dedong

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Hi,

This is no instance, no delay but just arrival and required time of the first timing arc in Innovus post-route timing report.

Could I ask where the arrival and required time come from?

Attached are the timing report and the applied sdc file generated from Genus.

Thanks!
 

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  • sdc.txt
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  • timing_full_clock.txt
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Required = (clock period) - (external/internal delay) - (uncertainty)
Arrival = what you actually get when the path was timed
Slack = required - arrival
 

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1250 period - 125 uncertainty - 375 output delay at the port is required time at the port.
= 750 ps


as for the arrival time, its the actual delays you see in your design (clk network. data path delays)

The bit i am not sure of - the phase shift number...
 

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phase shift = clock period in 99% of the cases.

exception #1: some portions of the design can have multi cycle paths, so you will see numbers that are N*period, with N in [1,2,3,...]

exeption #2: your design might have logic that operates on negedge and posedge, so phase shift will be clock_period/2.
 
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