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Altera_Forum
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18 years ago

DE1 Board detects (USB <-> Serial) instead of USB blaster

I downloaded the Quartus 7.1 SP1, Nios 7.1 SP1 and together with Megacore IP Lib. The first time I connected the USB cable, the windows found the new hardware and install the driver by pointing to x3...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

The problem may be cause the adapter lost it's identity that's stored in the 93C46 serial EEPROM connected to the FT245. Without a valid EEPROM content, the FTDI chip defaults to an USB-to-serial adapter. The EEPROM is not only used to identify the correct driver (this could be overcome by installing a particular driver explicitely) but also read in by the driver during startup. So most likely the USB-Blaster can't work without the correct EEPROM content. FTDI has the mprog tool donwloadable at FTDIchip.com to read and reprogram an EEPROM atached to an FTDI adapter. If it turns out, that the EEPROM content is altered, you can copy the EEPROM from an USB-Blaster or a functional DE1 board to your board.