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Bill,
Your UCF syntax looks OK.
If I understand what you describe, you have the uBlaze running on one clock, and your PLB device running on a different clock. This can cause problems.
Look carefully at the TWR file, and see what signals start on one clock and end on another. All of these...
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You have a FTC2232 driver somewhere in your system. The 2232D has the same PID as the 2232C, so it's not a surprise that XP can't tell them apart.
The 2232 appears as two devices - this is normal. You can configure each device for 245/232 operation in the XP...
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