Do VCC_CLKIN and VCCIO need to have the same voltage in Cyclone IV devices? - Do VCC_CLKIN and VCCIO need to have the same voltage in Cyclone IV devices? Description No, VCC_CLKIN and VCCIO do not need to be connected to the same voltage levels in Cyclone® IV devices. For example, the VCC_CLKIN can be powered with 2.5V while the VCCIO is powered with 3.3V for the same I/O bank. Refer to High Speed I/O Standards Support in I/O Features in Cyclone IV Devices (PDF) for further information. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Cyclone® IV GX FPGA'] ['novalue'] ['novalue'] ['novalue']