AR# 40778

描述

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
  • (Xilinx Answer 40779)MIG Spartan-6 MCB - How to properly terminate ODT, CKE, and RESET
• Usage of ODT (at the memory) andinput termination(at the FPGA)
  • (Xilinx Answer 40780)MIG Spartan-6 MCB - FPGA input termination options

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?

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.

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