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  3. AR# 63787: MIG UltraScale DDR3 - ERRORs in simulation are seen when using the Micron memory model for sg125 speed grade with CAS Latency = 9 and CAS Write Latency = 7

AR# 63787

MIG UltraScale DDR3 - ERRORs in simulation are seen when using the Micron memory model for sg125 speed grade with CAS Latency = 9 and CAS Write Latency = 7

Description

Version Found: MIG UltraScale v7.0
Version Resolved: See (Xilinx Answer 58435)

When simulating a MIG UltraScale DDR3 design using a Micron memory model targeting the sg125 speed grade with CAS Latency = 9 and CAS Write latency = 7, the following error message might be received:
 

# sim_tb_top.mem_model_x8.memRank[0].memModel[2].u_ddr3_x8.main: at time 6947904.0 ps ERROR: CAS Latency =           9 is illegal @tCK(avg) = 1500.220703
# sim_tb_top.mem_model_x8.memRank[0].memModel[2].u_ddr3_x8.main: at time 6947904.0 ps ERROR: CAS Latency =           9 is not valid when CAS Write Latency =           7

Solution

According to the Micron data sheet for the sg125 speed grade, CAS Latency=9 and CAS Write Latency=7 is supported.

Please contact Micron for a solution and timeline for when this issue will be fixed.

Revision History:
04/01/2015 - Initial Release

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
58435 DDR4, DDR3, QDRIV, QDRII+, RLDRAM3, LPDDR3 UltraScale and UltraScale+ - IP Release Notes and Known Issues N/A N/A
AR# 63787
Date 04/30/2015
Status Active
Type Known Issues
Devices
  • Kintex UltraScale
  • Virtex UltraScale
IP
  • MIG UltraScale
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