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  3. AR# 51580: Design Advisory for 14.1/14.2 Timing Analysis 7 Series - Clock Arrival Times are Incorrect for Block RAM (BRAM) or FIFO Components for PERIOD constraint analysis

AR# 51580

Design Advisory for 14.1/14.2 Timing Analysis 7 Series - Clock Arrival Times are Incorrect for Block RAM (BRAM) or FIFO Components for PERIOD constraint analysis

Description

When I analyze the timing paths to or from the block RAM or FIFO, the clock arrival time for either the source or destination clock is incorrect and makes the requirement extra small for the PERIOD constraint analysis. I should have a full cycle for these paths.

When is this going to be fixed?

Solution

This issue is going to be resolved in ISE Design Suite 14.3, but you must re-run implementation from NGDBuild.

The work-around is to use a FROM:TO constraint for paths going to and from the block RAM (BRAM).

A tactical patch for ISE Design Suite 14.2 is available; see the ZIP file at the end of this answer record.

Attachments

Associated Attachments

Name File Size File Type
ar51580_cr673578_timing_timegrp_cs_p28xd_14_2.zip 10 KB ZIP

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
42944 Design Advisory Master Answer Record for Virtex-7 FPGA N/A N/A
42946 Design Advisory Master Answer Record for Kintex-7 FPGA N/A N/A
51456 Design Advisory Master Answer Record for Artix-7 FPGA N/A N/A
AR# 51580
Date 03/02/2013
Status Active
Type Design Advisory
Devices
  • Kintex-7
  • Artix-7
  • Virtex-7
Tools
  • ISE Design Suite - 14.1
  • ISE Design Suite - 14.2