Answers Database M1.3/1.4 TRACE: A DPRAM DPO to destination FROM:TO constraint is not analyzed Record #3332 Product Family: Software Product Line: FPGA Implementation Product Part: map Product Version: 1.4. Problem Title: M1.3/1.4 TRACE: A DPRAM DPO to destination FROM:TO constraint is not analyzed Problem Description: Urgency: Hot General Description: A TNM attached to a DPRAM may not attach itself correctly to the RAM if the SPO output is not connected. For example, for the following path: |--------| | DPRAM | | spo|---x | | |----| | dpo|-----------------|D Q| | | |> | |--------| |----| tnm=myram tnm=myflop This path would be picked up by a PERIOD constraint. However, a constraint such as "TIMESPEC TS_IG=FROM:myram:TO:myflop:TIG;" will not be recognized (path still in PERIOD constraint ). Even if the constraint is not a TIG ( a normal FROM:TO, for instance), it will still not be recognized (PERIOD will still control it). Solution 1: This is actually a MAP bug, and it is fixed in a M1.4 patch on the FTP site. Go to: ftp://ftp.xilinx.com/pub/swhelp/M1.4_alliance and download the appropriate "core" patch for your platform. End of Record #3332 - Last Modified: 11/12/98 13:36

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