TUSB4041I

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SLLSEK3B – JULY 2015 – REVISED DECEMBER 2015

Table 13. Device Configuration Register 2 Field Descriptions (continued)

Bit

Field

Type

Reset

Description

This bit is loaded at the deassertion of reset with the value of the

AUTOENz/HS_SUSPEND pin.

The automatic mode only applies to downstream ports with battery charging

1

autoModeEnz

RW

X

enabled when the upstream port is not connected. Under these conditions:

0 = Automatic mode battery charging features are enabled.

1 = Automatic mode is disabled; only battery-charging DCP mode is

supported.

Reserved

0

RSVD

R

0

Read only, returns 0 when read.

(1)

When the upstream port is connected, battery charging 1.2 CDP mode will be supported on all ports that are enabled for battery

charging support regardless of the value of this bit, with the exception of port 1. CDP on port 1 is not supported when automatic mode is

enabled.

8.5.12 USB 2.0 Port Polarity Control Register

Offset = Bh

Figure 13. USB 2.0 Port Polarity Control Register

7

6

5

4

3

2

1

0

customPolarity

RSVD

p4_usb2pol

p3_usb2pol

p2_usb2pol

p1_usb2pol

p0_usb2pol

RW-0

R-0

R/RW-0

R/RW-0

R/RW-0

R/RW-0

R/RW-0

Table 14. USB 2.0 Port Polarity Control Register Field Descriptions

Bit

Field

Type

Reset

Description

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

7

customPolarity

RW

0

OTP ROM.

1 = The p[4:0]_usb2pol bits are R/W and can be loaded by EEPROM or written

by SMBus from this register.

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

Reserved

6:5

RSVD

R

0

Read only, returns 0 when read

Downstream port 4 DM/DP polarity

This bit controls the polarity of the port.

0 = USB 2.0 port polarity is as shown in the pinout.

4

p4_usb2pol

R/RW

0

1 = USB 2.0 port polarity is swapped from that shown in the pinout (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.

Downstream port 3 DM/DP polarity

This bit controls the polarity of the port.

0 = USB 2.0 port polarity is as shown in the pinout.

3

p3_usb2pol

R/RW

0

1 = USB 2.0 port polarity is swapped from that shown in the pinout (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.

Copyright © 2015, Texas Instruments Incorporated

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