Error occured when downloading .sof into device - Error occured when downloading .sof into device We use Quartus 20.2 programmer to download a .sof file to device(1SX280LN3F43E2VG), by JTAG(usb-blaster), and meet the problem below: Error (18950): Device has stopped receiving configuration data Error (18948): Error message received from device: Detected bitstream error. Please make sure that the bitstream is compatible with the current Quartus version and device version. (Subcode 0x0040, Info 0x00000003, Location 0x0000A800) Error (209012): Operation failed The .sof file is generated by Quartus Prime Pro 20.2 I would like to know what happened and how to fix it, thank you! Replies: Re: Error occured when downloading .sof into device Hi, Great to know that your issue is solved. I will proceed to close this case, however, if you need further support, you may open a new case in the future. Thanks. Regards, Aiman Replies: Re: Error occured when downloading .sof into device Thank you for your answer! Problem solved, the reason is input clock mismatched. I change the configuration clock source(in "device and pin options") from 125MHz to internal or 25MHz, then it works. And I checked the schematic diagram， it's a 25MHz oscillator connected to OSC_CLK_1 pin Replies: Re: Error occured when downloading .sof into device Hi, Thank you for contacting Intel community. You can check the error and workaround for Quartus Pro 20.2 in the link below: https://www.intel.com/content/www/us/en/programmable/quartushelp/20.2/index.htm#quartus/gl_quartus_welcome.htm 2.On top of that, please try to use latest version of Quartus Pro. Users should upgrade to the latest version of the Quartus. https://fpgasoftware.intel.com/20.2/?edition=pro&platform=windows Let me know if you need further information. Regards, Aiman