[SOLVED] I/O signaling standards supported in Xilinx I/O blocks

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ahmadagha23

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I/O signaling standards

Hi
1-where can I find some detailed information about I/O signaling standards supported in Xilinx I/O blocks?
2- Is it true that the bigger number for "speed Grade" in FPGAs means the better quality and in CPLDs means the lower quality?
regards
 

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