The XC1700 series of OTP (one-time programmable) configuration SPROMs is a popular choice for FPGA configuration. The XC18V00 series of PROMs accommodates the serial download method of the XC1700 series along with Express and SelectMAP mode parallel-load innovations. The XC18V00 devices also offer full IEEE Std 1149.1 boundary-scan (JTAG) support allowing in-system PROM programming and board level testing via the TAP port. In design environments where in-system reprogrammability is a desired feature, the XC18V00 series of PROMs is the best solution.