FTDI Community

Please login or register.

Login with username, password and session length.
Advanced Search  


Welcome to the FTDI Community!

Please read our Welcome Note

Technical Support enquires
please contact the team
@ FTDI Support

New Bridgetek Community is now open

Please note that we have created the Bridgetek Community to discuss all Bridgetek products e.g. EVE, MCU.

Please follow this link and create a new user account to get started.

Bridgetek Community

Author Topic: Force FT4232H to Full-Speed (12MBit)  (Read 654 times)


  • Newbie
  • *
  • Posts: 1
    • View Profile
Force FT4232H to Full-Speed (12MBit)
« on: February 08, 2021, 11:53:05 AM »


I want to force the FT4232 into full-speed mode. But unfortunately I don't know how to do it. I soldered a 1.5k Pullup resistor (3V3) to the D + lead. But this was unsuccessful. I can still measure signals at 480MHz on the data lines. The problem is that my cable is 6m long and therefore 1m too long. Therefore I would like to try it at full speed this should run much more stable than the high speed variant. I can hang the FT4232 on a full-speed hub in the hope that the FT4232H will then run in full-speed mode.


FTDI Community

  • Administrator
  • Hero Member
  • *****
  • Posts: 660
    • View Profile
Re: Force FT4232H to Full-Speed (12MBit)
« Reply #1 on: February 10, 2021, 02:41:40 PM »


Does the device enumerate as Full-Speed when you are using this 6m long cable? Are you seeing stability issues?

Yes, attaching the device to a USB hub which only supports USB Full-Speed would force the device to enumerate as a Full-Speed peripheral.

Best Regards,
FTDI Community