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If you want to Implement a master/target PCI core at 66mhz (with a PLDA PCI core), you must choose an altera acex (ie 1k100fc484) with -1 speed grade. In the case of the pci must be operate at 33mhz a -2 speed grade should be ok (do not use a -3 speed grade at 33mhz because it is too slow).
This informations depends also of the pci core selected. :wink: