Why does the Quartus II programmer generate JTAG error messages when programming a design security key using Encryption Key Programming (.ekp) into a Cyclone III LS device via a USB-Blaster? - Why does the Quartus II programmer generate JTAG error messages when programming a design security key using Encryption Key Programming (.ekp) into a Cyclone III LS device via a USB-Blaster? Description You may see the following error messages in the Quartus® II software version 9.1, SP1 and SP2 when the START button is pressed for the first time to program the Encryption Key Programming (.ekp) file into a Cyclone III LS device via a USB-Blaster™ download cable. Error: Can’t access JTAG chain Error: Can't configure device. Expected JTAG ID code 0x******** for device 1, but found JTAG ID code 0x00000000. Error: Operation Failed When the START button is pressed for the second time there are no errors and the programming is successful. This issue does not occur when using the ByteBlaster™ II or EthernetBlaster download cabels. Resolution This is fixed in Quartus II design software version 10.0. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 10.0 9.1 ['Cyclone® III LS FPGA'] ['novalue'] ['novalue'] ['novalue']