fpga pci board problem - hat does the 0xfffffffh mean?

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thepiper

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fpga pci board problem

hi, i have developed an fpga pci board and it's not working properly, when i write certain data into it, i get a 0xfffffffh on readback. what does the 0xfffffffh mean? i know it's what you get when you read a free port but could it also mean that one or more of the data lines is corrupted? (due do cross-talk) can it be a driver problem?
 

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