Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

[SOLVED] CRPR Threshold in PT

Status
Not open for further replies.

r1caw ex ua6bqg

Member level 2
Joined
Jun 27, 2017
Messages
44
Helped
0
Reputation
0
Reaction score
0
Trophy points
6
Activity points
403
Hi all!

I performed timing analysis in PT DMSA and have found that my "clock reconvergence pessimism" in report is 0 (crpr analysis is active), but my timing path has common clock path and CRPR value should be non-zero. I used "report_crpr" command on this path, results are presented below:

Common Clock: clk
Launching edge at common point: RISING
Capturing edge at common point: RISING
CRPR threshold: 0.1

Arrival Times (Static) Early Late CRP
---------------------------------------------------------------
Rise 0.1705 0.1896 0.0191
Fall 0.1675 0.1870 0.0195
---------------------------------------------------------------

Arrival Times (Dynamic) Early Late CRP
---------------------------------------------------------------
Rise 0.1641 0.1960 0.0319
Fall 0.1610 0.1935 0.0325
---------------------------------------------------------------

Selection Details
---------------------------------------------------------------
Arrival Times: Using Dynamic Arrivals
Edge Match: Match, using rise CRP
---------------------------------------------------------------
clock reconvergence pessimism 0.0319


Information: The CRP value reported by report_timing and report_clock_timing will be -0.0000. (UITE-468)

1
As seen, we have difference btw actual and reported in the timing report values (UITE-468 message). I tried to reduce "CRPR_threshold" value from this report ( by seting " timing_crpr_threshold_ps" command), but it does not work, I can only increase "CRPR threshold" value, but not decrease. The question is - how I can set this CRPR Threshold value and make CRP value from this report and from "report_timing" equal?
 

The problem is solved by updating PT tool.
 
Last edited:

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top