TUSB2E221 datasheet(23/65 Pages) TI

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8.3 Feature Description

8.3.1 USB 2.0

The TUSB2E221 supports two USB 2.0 ports. Each port supports low-speed, full-speed and high-speed

operations.

8.3.2 eUSB2

The TUSB2E221 supports two eUSB2 ports with low-speed, full-speed and high-speed operations.

8.3.3 Cross MUX

The TUSB2E221 supports a cross mux functionality that can map either of the two eUSB2 ports to the two USB

2.0 ports providing design flexibility.

8.4 Device Functional Modes

8.4.1 Repeater Mode

After the RESETB deassertion and t_RH_READY, the TUSB2E221 is enabled and enters the default state, ready to

accept eUSB2 packets.

Table 8-1. Number of Hubs Supported with Host and/or Peripheral Repeater

Number of eUSB2

Repeaters

Number of Hubs

Operating at HS

Number of Hubs

Operating at FS

Number of hubs operating at FS is reduced due to

Te_to_U_DJ1 and TRJR1.

Number of hubs operating at HS is reduced due to

SOP truncation and EOP dribble

non-eUSB2 system for reference

8.4.2 Power-Down Mode

RESETB can be used as a power-down pin when asserted low. Power-down mode puts the TUSB2E221 in the

lowest power mode.

8.4.3 UART Mode

In I2C mode GPIO0 defaults as an enable control for Carkit UART mode. GPIO0 is an active low signal to enable

Carkit UART mode. GPIO0 can be controlled through APU or SoC. When APU or SoC is not powered on or the

firmware has not been loaded, GPIO0 is low. When GPIO0 is low, the UART mode allows access to the APU or

SoC debug interface through the USB port.

Default Carkit UART direction is DP → eDP (RX) and eDN → DN (TX).

On the rising edge of GPIO0, followed by TMODE_SWITCH, the TUSB2E221 is enabled and enters the default

state, ready to accept eUSB2 port reset, configuration or RAP. The repeater mode is configured as host or

peripheral depending on the eUSB2-defined configuration received from eUSBr and acknowledged by the

repeater.

UART mode enable is controlled through GPIO0 after power up. This can be changed through

UART_use_bit1_Px bit in UART-PORTx register, so UART mode enable can be controlled through a register

instead of GPIO0.

www.ti.com

TUSB2E221

SNLS757B – JUNE 2024 – REVISED NOVEMBER 2024

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