XCF08P, XCF16P, and XCF32P PROM Eng Sample Errata and Platform Flash PROM Data Sheet Deviations (DS123-E01) - (1) TCK must be greater than 3 MHz. (2) FPGA might not start up correctly if PROM CLK_OUT is used. (3) PROM decompressor is not enabled. (4) PROM might not issue correct data for free-running CLK source (5) BUSY pin must be Low for erase and program operations (6) VCCINT power supply must ramp in less than 300 µs