Why does the TCK frequency setting of the USB-Blaster II download cable revert to the default value of 24 MHz after being changed? - Why does the TCK frequency setting of the USB-Blaster II download cable revert to the default value of 24 MHz after being changed? Description Even if the TCK frequency setting of the USB-Blaster ™ II download cable is changed using the jtagconfig command, as described in the related solution, the frequency setting may revert to the default value of 24MHz in the following cases: A jtagconfig command is executed when the USB-Blaster II download cable is removed from your PC. A jtagconfig command fails to recognize the USB-Blaster II download cable and shows an error. A JTAG operation like Hardware Setup is executed from the Quartus ® II software when the USB-Blaster II download cable is removed from your PC. Resolution You can obtain the TCK frequency setting in the USB-Blaster II download cable using the following command: jtagconfig --getparam <cable> JtagClock <cable> is the USB-Blaster II download cable to be modified. If the frequency is not your desired value, set it again. Related Articles How do I change the clock frequency of the USB-Blaster II download cable? Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 11.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']