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AR# 53250

7 Series Integrated Block for PCI Express - v1.8 (Vivado 2012.4) - Setup timing violation on userclk1


Version Found: v1.8
Version Resolved and other Known Issues: See (Xilinx Answer 40469)

When implementing a design with the 7 Series Integrated Block for PCI Express - v1.8 core, the tool reports the following setup timing violation:

Slack (VIOLATED) :        -0.268ns
  Source:                 core_i/inst/inst/pcie_top_i/pcie_7x_i/pcie_block_i/USERCLK
                            (rising edge-triggered cell PCIE_2_1 clocked by userclk1  {rise@0.000ns fall@1.000ns period=2.000ns})
  Destination:            core_i/inst/inst/pcie_top_i/pcie_7x_i/pcie_bram_top/pcie_brams_tx/brams[0].ram/use_sdp.ramb36sdp/genblk3_0.bram36_dp_bl.bram36_tdp_bl/DIBDI[8]
                            (rising edge-triggered cell RAMB36E1 clocked by userclk1  {rise@0.000ns fall@1.000ns period=2.000ns})
  Path Group:             userclk1
  Path Type:              Setup (Max at Slow Process Corner)
  Requirement:            2.000ns
  Data Path Delay:        2.127ns  (logic 1.040ns (48.900%)  route 1.087ns (51.100%))
  Logic Levels:           0 
  Clock Path Skew:        -0.082ns (DCD - SCD + CPR)
    Destination Clock Delay (DCD):    4.797ns = ( 6.797 - 2.000 )
    Source Clock Delay      (SCD):    5.240ns
    Clock Pessimism Removal (CPR):    0.361ns
  Clock Uncertainty:      0.059ns  ((TSJ^2 + DJ^2)^1/2) / 2 + PE
    Total System Jitter     (TSJ):    0.071ns
    Discrete Jitter          (DJ):    0.095ns
    Phase Error              (PE):    0.000ns


This is a known issue to be fixed in a future release of the core.

Note: "Version Found" refers to the version where the problem was first discovered. 

The problem might also exist in earlier versions, but no specific testing has been performed to verify earlier versions.

Revision History
12/18/2012 - Initial release

Linked Answer Records

Master Answer Records

AR# 53250
Date 02/20/2015
Status Active
Type Known Issues
  • 7 Series Integrated Block for PCI Express (PCIe)