The MIG Spartan-6 MCB design requires that specific trace matching guidelines be followed to ensure proper behavior in hardware. The trace length/matching guidelines are available in theSpartan-6 FPGA Memory Controller User Guide(UG388); see the"Designing with the MCB">"PCB Layout Considerations" section: http://www.xilinx.com/support/documentation/ip_documentation/ug388.pdf.
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Common Trace Matching Questions