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TUSB211-Q1: How to detect ENA_HS

Kuramochi Tadahiko
Guru 28715 points
Part Number: TUSB211-Q1
Other Parts Discussed in Thread: TUSB211

Hi,

Could you tell me how the TUSB211-Q1 detect HS mode in detail?

i.e.) detect voltage, timing, etc

The TUSB211 misdetects HS mode on the customer's system.

Best Regards,

Kuramochi 

  • 0
    TI__Mastermind 36085 points
    Hello Kuramochi-san,

    The 211 checks DP and DM for pull-up or pull-down to determine if the link is High-Speed or not. High-speed devices will start by connecting as a full speed device (1.5k to 3.3V). Once it has been attached, it will do a high-speed chirp during reset and establish a high-speed connection if the hub supports it. If the device operates in high-speed mode, then the pull-up resistor is removed to balance the line.

    Regards,
    Diego.