TUSB2E221 datasheet(27/65 Pages) TI

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Table 8-2. eUSB2 to USB Mapping

CROSS = 0

CROSS = 1

eUSB0 (eDP0, eDN0)

USBA (DPA, DNA)

USBB (DPB, DNB)

eUSB1 (eDP1, eDN1)

USBB (DPB, DNB)

USBA (DPA, DNA)

8.4.9 USB 2.0 High-Speed HOST Disconnect Detection

USB 2.0 specification does not specify high-speed output differential swing VOD during disconnect without

external load. Only chirp level and HS host disconnect threshold are specified. Specification implicitly assumes

high-speed output differential swing VOD will double during disconnect. However, the high-speed output

differential swing during disconnect depends on the USB 2.0 TX output swing and pre-emphasis setting, as

the common-mode voltage increase can saturate the output swing level and may not double.

The high-speed host disconnect threshold can be adjusted to provide the most margin to avoid false disconnect

as well as failure to detect a disconnect. See Table 8-3.

Table 8-3. Recommended USB 2.0 High-Speed HOST Disconnect Thresholds per USB HSTX Amplitude

and Pre-Emphasis

USB HS TX Pre-Emphasis

USB HS TX

Amplitude (Vp-p)

0.5dB (0h)

0.9dB (1h)

1.2dB (2h)

1.7dB (3h)

2.1dB (4h)

2.5dB (5h)

740mV (0h )

545mV (1h)

760mV (1h )

565mV (2h)

780mV (2h )

585mV (3h)

800mV (3h )

585mV (3h)

820mV (4h )

605mV (4h)

840mV (5h )

625mV (5h)

860mV (6h )

645mV (6h)

625mV (5h)

880mV (7h )

645mV (6h)

900mV (8h )

665mV (7h)

645mV (6h)

920mV (9h )

685mV (8h)

665mV (7h)

940mV (Ah )

685mV (8h)

665mV (7h)

960mV (Bh )

705mV (9h)

685mV (8h)

665mV (7h)

980mV (Ch )

725mV (Ah)

705mV (9h)

685mV (8h)

1000mV (Dh )

725mV (Ah)

705mV (9h)

685mV (8h)

1020mV (Eh )

725mV (Ah)

705mV (9h)

685mV (8h)

1040mV (Fh )

745mV (Bh)

725mV (Ah)

705mV (9h)

685mV (8h)

8.4.10 Frame Based Low Power Mode

The USB2.0 standard defines high-speed microframes that occur every 125μs. Using a patented design, the

TUSB2E221 monitors idle conditions within every high-speed microframe. The TUSB2E221 will enter a low

power state if the bus is idle for greater than 7.8125μs and will remain in the low power state until the start of

the next μSOF. This feature is enabled by default and can be disabled by clearing HOST_FRAME_LP_EN_Px or

DEVICE_FRAME_LP_EN_Px bits.

Table 8-4 shows an example of the typical high-speed idle power the TUSB2E221 consumes based on whether

or not the frame based low power is enabled. These results assume the TUSB2E221 is in host repeater mode.

Table 8-4. Typical Single Port High-Speed Idle Power for Frame Base LP Mode

HOST_FRAME_LP_EN_Px

1.8V current (mA)

3.3V current (mA)

0 (Disabled)

2.8

1 (Enabled)

2.0

www.ti.com

TUSB2E221

SNLS757B – JUNE 2024 – REVISED NOVEMBER 2024

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