confusing wordcount in virtex2pro-bitstream

Jan 18, 2005 0 Replies

Hello,



i was playing a bit with bitgen, especially with bitgen -g PartialMaskXX. After examining the resulting bitstream i found a lot of writes to the FDRI-Register (followed after a write tom the FAR-Register ) with an irritating wordcount. Normally, for my V2P7 i'm writing a frame consisting of 424 bytes/106 words. The FDRI command would then look like 30 00 40 6a. But in the bitstream i was examing i saw things like 30 00 40 d4 or 30 00 40 02, indicating that 212 (2*106 ?) or only 2 words would be written. My understanding is that there must always be written a complete frame (= 106 words with my device). I'm somewhat confused about those odd numbers. Maybe one of the readers has a further understanding of the wordcount and can explain me the resulting behaviour?



regards Patrick Siegel



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