Generation of the ALTGXB megafunction can fail for Arria II GX - Generation of the ALTGXB megafunction can fail for Arria II GX Description If you attempt to generate the ALTGXB megafunction from a command line using qmegawiz -silentgeneration fails with messages similar to the following: Error: The GXB PLL 'CMU' parameter 'input_clock_frequency' is set to an illegal value of '155.52 MHz'. The value is illegal when the device speed grade is '4', the parameter 'base_data_rate' is set to '2967.0 Mbps', and the parameter 'Pll Type' is set to 'CMU' on atom 'test_alt4gxb_t3t6:test_alt4gxb_t3t6_component|tx_pll_alt0' Error: The 'GXB PLL' parameter 'm' is set to an illegal value of '1'. The reference clock frequency to the PLL PFD (phase-frequency detector), which is input_clock_frequency ('155.52 MHz') \ n ('1'), must be the same as the feedback frequency to the PLL PFD, which is base_data_rate ('2967.0 Mbps') \ 2 \ m on atom 'test_alt4gxb_t3t6:test_alt4gxb_t3t6_component|tx_pll_alt0 ' Error: The 'GXB PLL' parameter 'n' is set to an illegal value of '1' on atom 'test_alt4gxb_t3t6:test_alt4gxb_t3t6_component|tx_pll_alt0'. The value of n is restricted based on the min and max reference clocks to the PLL PFD (phase-frequency detector) for the speed grade of 4 and the specific Pll Type of 'CMU'. For non-basic protocol configurations, the value of N is fixed. Resolution Use the MegaWizard Plug-In Manager GUI to configure and generate your ALTGXB megafunction. Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 10.0 ['Arria® II FPGAs'] ['novalue'] ['novalue'] ['novalue']