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  3. AR# 64146: UltraScale DDR3 - simulation warnings for 16Gb and 8Gb DDR3 TwinDie parts

AR# 64146

UltraScale DDR3 - simulation warnings for 16Gb and 8Gb DDR3 TwinDie parts

Description

Version Found: DDR3 v7.0

Version Resolved: See (Xilinx Answer 69036)

When running behavioral simulations for 16Gb and 8Gb DDR3 TwinDie parts (i.e. MT41K1G16DGA-125, MT41K1G16DGA-125 etc.) the following warnings are received:

# ** Warning: (vsim-3015) ./../../../mig_5_example.srcs/sim_1/imports/tb/sim_tb_top.sv(417): [PCDPC] - Port size (15) does not match connection size (16) for port 'addr'. The port definition is at: ./../../../mig_5_example.srcs/sim_1/imports/tb/ddr3_model/ddr3.v(101).
#         Region: /sim_tb_top/mem_model_x16/mem/memRank[0]/memModel[0]/u_ddr3_x16
# ** Warning: (vsim-3015) ./../../../mig_5_example.srcs/sim_1/imports/tb/sim_tb_top.sv(417): [PCDPC] - Port size (15) does not match connection size (16) for port 'addr'. The port definition is at: ./../../../mig_5_example.srcs/sim_1/imports/tb/ddr3_model/ddr3.v(101).

Solution

This is a result of Micron not having 16Gb or 8Gb memory models available for simulation.

Due to no memory model being available, MIG automatically sets the density to 4Gb for the test bench and memory model only so that behavioral simulations can still be run.

As a result there are only 15 address bits connected which results in the warning messages.

These warning messages can be safely ignored and no work-around is needed.

Please check with Micron on availability of 8Gb models.

Revision History:

04/15/2015 - Initial Release

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
69036 UltraScale/UltraScale+ DDR3 - Release Notes and Known Issues N/A N/A
AR# 64146
Date 01/08/2018
Status Active
Type Known Issues
Devices
  • Kintex UltraScale
  • Virtex UltraScale
Tools
  • Vivado Design Suite - 2015.1
IP
  • MIG UltraScale

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