TUSB8042AI datasheet(32/64 Pages) TI2

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8.12 USB 2.0 Port Polarity Control Register

Figure 8-11. Register Offset Bh

Bit No.

Reset State

Table 8-12. Bit Descriptions – USB 2.0 Port Polarity Control Register

Bit

Field

Type

Description

customPolarity

Custom USB 2.0 Polarity. This bit controls the ability to write the

p[4:0]_usb2pol bits.

0 = The p[4:0]_usb2pol bits are read only and the values are loaded

from the OTP ROM.

1 = The p[4:0]_usb2pol bits are read/write and can be loaded by

EEPROM or written by SMBus.

This bit can be written simultaneously with the p[4:0]_usb2pol bits

6:5

RSVD

Reserved. Read only, returns 0 when read.

p4_usb2pol

RO/RW

Downstream Port 4 DM/DP Polarity. This controls the polarity of the

port.

0 = USB 2.0 port polarity is as documented by the pin out

1 = USB 2.0 port polarity is swapped from that documented in the pin

out; that is, DM becomes DP and DP becomes DM.

This bit is read only unless the customPolarity bit is set to 1. If

customPolarity is 0 the value of this bit reflects the value of the OTP

ROM p4_usb2pol bit.

p3_usb2pol

RO/RW

Downstream Port 3 DM/DP Polarity. This controls the polarity of the

port.

0 = USB 2.0 port polarity is as documented by the pin out

1 = USB 2.0 port polarity is swapped from that documented in the pin

out; that is, DM becomes DP and DP becomes DM.

This bit is read only unless the customPolarity bit is set to 1. If

customPolarity is 0 the value of this bit reflects the value of the OTP

ROM p3_usb2pol bit.

p2_usb2pol

RO/RW

Downstream Port 2 DM/DP Polarity. This controls the polarity of the

port.

0 = USB 2.0 port polarity is as documented by the pin out

1 = USB 2.0 port polarity is swapped from that documented in the pin

out; that is, DM becomes DP and DP becomes DM.

This bit is read only unless the customPolarity bit is set to 1. If

customPolarity is 0 the value of this bit reflects the value of the OTP

ROM p2_usb2pol bit.

p1_usb2pol

RORW

Downstream Port 1 DM/DP Polarity. This controls the polarity of the

port.

0 = USB 2.0 port polarity is as documented by the pin out

1 = USB 2.0 port polarity is swapped from that documented in the pin

out; that is, DM becomes DP and DP becomes DM.

This bit is read only unless the customPolarity bit is set to 1. If

customPolarity is 0 the value of this bit reflects the value of the OTP

ROM p1_usb2pol bit.

p0_usb2pol

RO/RW

Upstream Port DM/DP Polarity. This controls the polarity of the port.

0 = USB 2.0 port polarity is as documented by the pin out

1 = USB 2.0 port polarity is swapped from that documented in the pin

out; that is, DM becomes DP and DP becomes DM.

This bit is read only unless the customPolarity bit is set to 1. If

customPolarity is 0 the value of this bit reflects the value of the OTP

ROM p0_usb2pol bit.

TUSB8042A

SLLSF93A – JUNE 2019 – REVISED JANUARY 2025

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