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  3. AR# 53607: Design Advisory for MIG 7 Series QDRII+ - Inferred latches cause write calibration failures. Work-around required.

AR# 53607

Design Advisory for MIG 7 Series QDRII+ - Inferred latches cause write calibration failures. Work-around required.

Description

Version Found:v1.7
Version Resolved and other Known Issues:See(Xilinx Answer 45195).

The MIG 7 Series QDRII+ design incorrectly infers latches within the calibration RTL.The latches can cause the calibration state machine to incorrectly jump tothe write calibration stage prematurely. This causes calibration to fail during the write calibration stage.

Solution

To work around this issue,RTL updates to remove the inferred latches are needed. The patch located at the bottom of this answer record includesa drop-in replacement "qdr_phy_write_init_sm.v" module for both theMIG 7 Series v1.7 and v1.8designs.Installation instructions for the patch are also included in the patch zip file.

Revision History
01/11/2013- Initial release

Attachments

Associated Attachments

Name File Size File Type
AR53607.zip 25 KB ZIP

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
45195 MIG 7 Series - Release Notes and Known Issues for All ISE versions and Vivado 2012.4 and older tool versions N/A N/A
AR# 53607
Date 03/02/2013
Status Active
Type Design Advisory
Devices
IP