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AR# 39076

MIG Virtex-6, Spartan-6 FPGA MCB - Disabling the DLL from a Micron memory DIMM

Description

I want to run the DDR3 on a lower clock speed than Xilinx offers. According to the FAQ from the Micron website, their DDR3 SDRAMs can work with the DLL on their component turned Off:
http://www.micron.com//support/faq/ddr3_sdram.html

Does the Xilinx MIG controller support this?

Solution

No, MIG does not support disabling the DLL to run the controller at slower clock frequencies for any memory device or FPGA family.

NOTE: The MRS_DLL_RESET parameter in the MIG Virtex-6 RLDRAM II designs must be set to "DLL_ON" as turning this parameter Off is not supported.

Linked Answer Records

Associated Answer Records

AR# 39076
Date Created 01/20/2011
Last Updated 11/19/2012
Status Active
Type General Article
Devices
  • Spartan-6
  • Virtex-4
  • Virtex-5
  • More
  • Virtex-6
  • Virtex-7
  • Kintex-7
  • Spartan-3A
  • Spartan-3E
  • Less
IP
  • MIG