Timing “trace” (trce) tool

Clock domain crossing (CDC) test

To illustrate how it handles CDC analysis

  • .v:
  • .ucf:
  • .twr:

Was based off of a KC705 project but doesn't really matter

$ grep -Hn rising kc705_cdctest_top.twr 
kc705_cdctest_top.twr:45:  Source Clock:         clk_200m rising at 0.000ns
kc705_cdctest_top.twr:46:  Destination Clock:    clk_200m rising at 5.000ns
kc705_cdctest_top.twr:82:  Source Clock:         clk_200m rising at 5.000ns
kc705_cdctest_top.twr:83:  Destination Clock:    clk_200m rising at 5.000ns
kc705_cdctest_top.twr:149:  Source Clock:         clk_211m rising at 0.000ns
kc705_cdctest_top.twr:150:  Destination Clock:    clk_211m rising at 4.739ns
kc705_cdctest_top.twr:186:  Source Clock:         clk_211m rising at 4.739ns
kc705_cdctest_top.twr:187:  Destination Clock:    clk_211m rising at 4.739ns
kc705_cdctest_top.twr:254:  Source Clock:         clk_mmcm_13m rising at 538.461ns
kc705_cdctest_top.twr:255:  Destination Clock:    clk_mmcm_11m rising at 545.454ns
kc705_cdctest_top.twr:286:  Source Clock:         clk_mmcm_11m rising at 0.000ns
kc705_cdctest_top.twr:287:  Destination Clock:    clk_mmcm_11m rising at 90.909ns
kc705_cdctest_top.twr:323:  Source Clock:         clk_mmcm_11m rising at 90.909ns
kc705_cdctest_top.twr:324:  Destination Clock:    clk_mmcm_11m rising at 90.909ns
kc705_cdctest_top.twr:351:  Source Clock:         clk_mmcm_13m rising at 615.384ns
kc705_cdctest_top.twr:352:  Destination Clock:    clk_mmcm_11m rising at 545.454ns
kc705_cdctest_top.twr:423:  Source Clock:         clk_mmcm_11m rising at 454.545ns
kc705_cdctest_top.twr:424:  Destination Clock:    clk_mmcm_13m rising at 461.538ns
kc705_cdctest_top.twr:455:  Source Clock:         clk_mmcm_13m rising at 0.000ns
kc705_cdctest_top.twr:456:  Destination Clock:    clk_mmcm_13m rising at 76.923ns
kc705_cdctest_top.twr:492:  Source Clock:         clk_mmcm_13m rising at 76.923ns
kc705_cdctest_top.twr:493:  Destination Clock:    clk_mmcm_13m rising at 76.923ns
kc705_cdctest_top.twr:520:  Source Clock:         clk_mmcm_11m rising at 454.545ns
kc705_cdctest_top.twr:521:  Destination Clock:    clk_mmcm_13m rising at 384.615ns

The MCMs are less constrained than the external clocks: the MMCM clocks have no CDC constraints but the external clocks do

 
xilinx/trce.txt · Last modified: 2013/11/04 13:03 by sky
 
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