AR# 50858
MIG Virtex-5 DDR2 Dual Rank - Incorrect Pre-charge issued when switching ranks causing data errors
Description
The Virtex-5 DDR2 Dual Rank design has been found to incorrectly issue a pre-charge when switching between ranks. Because the controller mistakenly sends the pre-charge, an activate is not sent to the closed location, causing data errors in both simulation and hardware. This issue will be seen in all MIG versions of the Virtex-5 dual rank design.Solution
The issue found is within the bank management logic of the controller logic. A fix has been identified and fully tested. The issue and subsequent fix are displayed here:
The fix and corresponding instructions can be downloaded from the link at the bottom of this answer record.
Was this Answer Record helpful?
Attachments
Associated Attachments
| Name | File Size | File Type |
|---|---|---|
| ar50858.zip | 21 KB | ZIP |
| AR# 50858 | |
|---|---|
| Date | 03/02/2013 |
| Status | Active |
| Type | Known Issues |
| Devices |
|
| IP |
|