The XC17S00A family of PROMs provide an easy-to-use, cost-effective method for storing Spartan-II/Spartan-IIE device configuration bitstreams. When the Spartan device is in Master Serial mode, it generates a configuration clock that drives the Spartan PROM. A short access time after the rising clock edge, data appears on the PROM DATA output pin that is connected to the Spartan device D IN pin. The Spartan device generates the appropriate number of clock pulses to complete the