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AR# 40778

MIG Spartan-6 MCB - Termination and I/O Standard Guidelines

描述

The MIG Spartan-6 MCB designs are characterized with specific termination schemes and I/O Standards.The "Designing with the MCB" > "PCB Layout Considerations" section of the Spartan-6 FPGA Memory Controller User Guide (UG388) includes information on termination guidelines and the MIG design's usage of I/O Standards:http://www.xilinx.com/support/documentation/ip_documentation/ug388.pdf

NOTE: This Answer Record is part of the Xilinx MIG Solution Center (Xilinx Answer 34243). The Xilinx MIG Solution Center is available to address all questions related to MIG. Whether you are starting a new design with MIG or troubleshooting a problem, use the MIG Solution Center to guide you to the right information.

解决方案

Termination

Running SI Simulation using IBIS Models is highly recommended for all memory designs. The user guide section noted above includes information on the following:

  • Termination guidelines for uni- and bi-directional signals
  • Where termination resistors should be placed
  • How to properly terminate ODT, CKE, and RESET to adhere to the DDR, DDR2 and DDR3 Memory standards initialization processes
  • Usage of ODT (at the memory) andinput termination(at the FPGA)

Please read the entire section noted above for full details.

See also:

(Xilinx Answer 38623)MIG Spartan-6 MCB - Why is ODT issued late by the MCB when operating in DDR2 mode 400 Mbps?
(Xilinx Answer 38819)MIG v3.6, Spartan-6 MCB - Does the MCB support Dynamic ODT?
(Xilinx Answer 38651)MIG 3.6 Spartan-6 - DDR termination recommendation
(Xilinx Answer 41721)MIG Spartan-6 MCB DDR3 SDRAM - Is "OUT_TERM = UNTUNED_50" UCF constraint supported for MCB design?

I/O Standards

The MIG tool creates the UCF using the appropriate standard based on input from the GUI. The MIGUCF can be found in either the "example_design/par" or "user_design/par" directories. Only the I/O standards provided in the MIG UCFs have been tested in hardware during MIG characterization.

链接问答记录

子答复记录

Answer Number 问答标题 问题版本 已解决问题的版本
41721 MIG Spartan-6 MCB DDR3 SDRAM - Is the "OUT_TERM = UNTUNED_50" UCF constraint supported for MCB designs? N/A N/A

相关答复记录

AR# 40778
日期 12/15/2012
状态 Active
Type 综合文章
器件
  • Spartan-6 LX
  • Spartan-6 LXT
IP
  • MIG
的页面