Are XC18V00s compatible with Spartan/XL/II/IIE/3 FPGAs? What about the XC4000E/XL family?
The XC18V00 can configure all Xilinx FPGAs. However, designers should be aware of the signaling thresholds -- specifically, the Vih of the PROM needs to be less than the Voh (min) of the FPGA, and the Vih of the FPGA needs to be less than the Voh (min) of the PROM. The following families meet these specifications: