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STA

meet skew via constraint

July 6, 2015

setOptMode -ignorePathGroupsForHold {in2reg reg2reg in2out} -holdTargetSlack 0 -setupTargetSlack 0 -fixHoldAllowSetupTnsDegrade false setOptMode -holdFixingCells {BUFFER_NAME} setDelayCalMode -engine xxx -SIAware true -signoff true set_analysis_view -setup funcPostC_PVT_setup  -hold funcPostC_PVT_setup update_constraint_mode -name funcPostC -sdc_files “constraint_file_path” optDesign -postRoute -outDir ./rpts/fix_skew_setup update_constraint_mode -name funcPostC -sdc_files “constraint_file_path” setOptMode -fixHoldAllowSetupTnsDegrade true optDesign -postRoute -hold -outDir ./rpts/fix_skew_hold constraint file set DQS_TSEL_SEL {tsel_dqs_1_opad tsel_dqs_2_opad tsel_dqs_3_opad}… read more »

OCV

July 6, 2015

For chip tapeout, physical design must clean timing/skew/transition violations based on OCV (on chip variation) derating in signoff STA environment. http://www.techdesignforums.com/practice/guides/on-chip-variation-ocv/ For example, when check setup violation, launch path is late, clock cell delay times 1.039, data cell delay times 1.077, capture path is early, clock cell delay times 0.961, clock net delay times 0.915…. read more »

update clock latency

April 14, 2019

Pre CTS or placement, clock latency, skew, transition are considered as ideal zero, but tool add clock buffer/inverter in CTS period in order to minimums clock latency/skew/transition as much as possible, clock tree has insertion delay after CTS. Post CTS and post route, comparing to datapath delay change, clock path in launch path ‘stretch’, especially… read more »

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