Hi Everyone. I am using XCF16 PROM in our boards. Those chips are Eng. Samples . from some reason in some boards we can detect all the JTAG chain and load configure the FPGA sucssefuly. But on the other boards IMPACT detects only the FPGA in the JTAG chain, I try to reduce the TCK frequency but it doesn't seem to do any good. note that i have the latest software updates. any idea? Thanks. Harel