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TUSB2077A: USB HUB does not working with USB 1.0/1.1 devices

Karel Klos
Prodigy 10 points
Part Number: TUSB2077A


Hi,

I´m developing a 5port USB hub. All USB 2.0 devices work without any issues. But USB 1.0/1.1 devices do not work..
I´ve tested wired keyboards and wired mouses - not working.....
Wireless keyboards, wireless mouses, USB WiFi dongles, USB sticks are working OK....
I´m using a self-powered mode and external 48MHz crystal oscillator. Ports 6 and 7 are not used. They are connected using pull down 15k resistors on DM/DP pins to GND. Upstream is connected directly to RPi Compute Module.
4442.usb hub.pdf
  • 0
    TI__Guru 60870 points
    Hi Karel,

    Can you check that the DM lines is seen as pulled high at the pin of the TUSB2077A when the low speed device is attached? What does the upstream host report when a low speed device is attached?

    Thanks,
    JMMN