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13 Threads found on Tns Wns
In each stage of the PnR flow, should we try to fix all the violations or can we proceed even if we have some violation? What is the criteria for it? For example, when I go for floorplanning, should I make sure that the initial netlist itself does not have any negative wns? How much wns and tns I can allow in the initial phase? Should (...)
Hi. As I know basically, in synthesis, we can get the information which is wns,tns, from start point to end point critical data path from synthesis schematic. Also mostly in initial synthesis, we focus/concentrate on the setup violation because the hold violation is changed from CTS flow and P&R flow. But I'm confused that the effect clock ske
fix hold will recude setup tns or increase setup tns? what about setup wns
hi You need to check if the timing is clean in your layout implementation tool as well as your timing signoff tool you need to check for timing (wns, tns) , max cap , max trans violations in your reports , which path group are violating ... Thanks vlsidesign
1. report_qor (synopsys DC) - to see overall statistics of setup wns/tns. 2. report_timing - to see setup slack of the defined path. 3. report_power - if power is the important goal. 4. if you did physical synthesis (DC topo) - see congestion report, maybe you will need to change floorplan.
Which is a better measure of Timing perfomance tns (or) wns?
Looking at the wns/tns does not make sense to me. Beginning Mapping Optimizations (Medium effort) ------------------------------- ELAPSED WORST NEG TOTAL NEG DESIGN TIME AREA SLACK SLACK RULE COST ENDPOINT --------- --------- --------- --------- -
wns : Worst negative Slack . Each clock domain, what is the Worst vioalting path it reports. tns : The sum of all wns across clock domains. If wns is zero for all clock domains, tns is zero. Usually, we try to reduce the tns, so that no of violating paths will reduce drastically, (...)
hi guys, i observed in my design that there is significant difference between syn and place wns and tns. why does syn has higher numbers of wns,tns compared to place. DC_topo does some coarse placement for rc estimation, 1.does dc do more buffering than icc the rc estimation more pessimistic in dc than ICC? thanks, (...)
Total negative slacks(tns)= 0.000 Worst negative slacks(wns)= Number of timing violation paths= 0 Number of total timing paths= 0 ** in2out pathgroup ** Total negative slacks(tns)= 0.000 Worst negative slacks(wns)= Number of timing violation paths= 0 Number of total timing paths= 0 ** in2reg pathgroup ** Total (...)
yes y ppl r rgt tns: total number of negative slack (violated ) paths wns: worst path ...path having max. slack
Hi all, In book "Advanced.ASIC.Chip.Synthesis", it is said that Synopsys use tns(Total Negative Slack) instead of wns(Worst Negative Slack). And tns is the summation of all the Negative Slack of the top critical path. But when I read the report, if the critical path is very long, how can I know the sub critical path. And what's the (...)
Hi, In DC, Total Negative Slack (tns) is the total of all of your violations (negative value). In ur tns, there is Worst Negative Slack. Meaning, ur worst (or big) violation. FYI, Design Compiler optimizes based on worst negative slack only, not on total negative slack. Pls correct me if I'm wrong. rgds,