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Altera_Forum
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8 years ago

Using Byte Blaster Rev. C with FTDI232RL breakout board

I have a USB Byte Blaster Rev. C. For certain reasons I am trying to connect my FPGA to a breakout board that has a FTDI232RL on it. There are 3 USB cables that I have to use at this time. The ...
Altera_Forum's avatar
Altera_Forum
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8 years ago

Presume you are asking about USB Blaster Rev. C rather than Byte Blaster.

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This is kinda expected when using USB Blaster cable with another FTDI chip at the same time. Unless the driver provided for the external FTDI is different, then only Quartus programmer/Nios EDS can detect the FTDI chip separately. You may consider to use USB Blaster II cable as this cable is using a different driver (WinUSB drivers) from FTDI driver. Thus there won’t any confliction when using other FTDI periphery the same time.

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It's in fact a known problem, but not at all expectable.

http://www.alteraforum.com/forum/showthread.php?t=2015

In fact it's a very old problem as you can see when reviewing old discussions related to FTDI driver conflicts. The problem was solved for many years and seemed to have reappeared with Windows 7/10 and/or 64-Bit USB Blaster drivers. In my view it's a real shame to Altera doesn't manage to fix the driver bug.