8.3 Feature Description

8.3.1 USB 2.0

TUSB2E22 supports two USB 2.0 ports. Each port supports Low Speed, Full Speed and High Speed operations.

8.3.2 eUSB2

TUSB2E22 supports two eUSB2 ports with 1.2V single ended signaling. Each port support Low Speed, Full

Speed and High Speed operations.

8.3.3 Cross MUX

TUSB2E22 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

Upon de-assertion of RESETB and after t_RH_READY , TUSB2E22 will enable and enter default state and be

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

1

4

2

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

2

3

1

0

5

5

non-eUSB2 system for reference

8.4.2 Power Down Mode

RESETB could be used as a power down pin when asserted low. Power down mode will put TUSB2E22 in

lowest power mode.

8.4.3 CROSS

CROSS pin will control the orientation of the integrated cross bar mux.

Upon de-assertion of RESETB followed by internally generated reset signal and 1ms delay, CROSS pin is

sampled and latched.

The system needs to make sure that CROSS meets t_su_CROSS and t_hd_CROSS with respect to power supply

ramp and RESETB de-assertion per Section 9.3.

Changes to the state of the CROSS input while RESETB is high will be ignored.

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)

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TUSB2E22

SNLS648B – FEBRUARY 2019 – REVISED OCTOBER 2023

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Product Folder Links: TUSB2E22