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AR# 65732

MIG UltraScale DDR4/DDR3 - "Reading unwritten address" warnings seen in simulation

Description

In simulation, the following warnings from the Micron model might be given, even if the testbench does not read from unwritten address locations:

# Model:WARNING: Reading unwritten address: C:0 BG:0 B:0 R:0 C:6 dm:0 @11524.401 ns

Solution

These warnings are caused by the MIG periodic reads and can be ignored.

To remove these warnings, you can modify your testbench to first perform a dummy write to address location '0', so that it does contain valid data for the periodic reads.

Revision History:

10/16/2015 - Initial Release

AR# 65732
Date Created 10/16/2015
Last Updated 10/23/2015
Status Active
Type General Article
Devices
  • Kintex UltraScale
  • Virtex UltraScale
IP
  • MIG UltraScale