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We are using GPIF II to connect to our FPGA board with high speed parallel cable. We are sending 32-bit counter from our FPGA board for testing. There were some error data received on the host PC side with the value increased by 4 instead of 1 from FPGA. We were trying different value for the FLAGA watermark value using following function. The only way we can have it correct is using watermark value 3 as listed below.