TUSB8044AI datasheet(35/69 Pages) TI1

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TUSB8044A

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SLLSF92A – FEBRUARY 2019 – REVISED MARCH 2019

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8.5.12 USB 2.0 Port Polarity Control Register

Figure 13. Register Offset Bh

Bit No.

Reset State

Table 20. 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 may 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, i.e. 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, i.e. 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, i.e. 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, i.e. 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, i.e. 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.

8.5.13 Billboard AlternateModeVdo

Figure 14. Register Offset 0Ch - 0Fh (Billboard AlternateModeVdo)

Bit No.

Reset State

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