How do I enable the internal clamping diode on Arria V and Cyclone V devices? - How do I enable the internal clamping diode on Arria V and Cyclone V devices? Description Due to a problem in the Quartus® II software version 11.1 SP2 and earlier, there is no assignement for Arria® V and Cyclone® V devices to enable the clamping diode for I/O standards where it is not enabled by default, for example 3.3-V LVCMOS. Resolution An assignment to enable the clamping diode for Arria V and Cyclone V devices is available beginning with the Quartus II software version 12.0. Custom Fields values: ['novalue'] Troubleshooting novalue False ['PCI'] ['FPGA Dev Tools Quartus II Software'] 12.0 11.1 ['Arria® V GT FPGA', 'Arria® V GX FPGA', 'Arria® V ST FPGA', 'Arria® V SX FPGA', 'Cyclone® V E FPGA', 'Cyclone® V GT FPGA', 'Cyclone® V GX FPGA', 'Cyclone® V SE FPGA', 'Cyclone® V ST FPGA', 'Cyclone® V SX FPGA'] ['novalue'] ['novalue'] ['novalue']