Do the Spartan or Virtex FPGAs have internal charge pumps?
The following Xilinx FPGAs DO NOT have internal charge pumps:
The following Xilinx FPGAs DO have internal charge pumps:
NOTE: The Spartan-3AN FPGA does not have an internal charge pump. However, there is an internal flash that does have charge pumps, which is a must for flash to work. There are charge pumps used during program/erase and also a small low current standby pump. The standby pump is always on. If it is a must that you turn these charge pumps off, please contact Technical Support and reference this Answer Record.