TUSB8041-Q1 Datasheet, PDF (22/48 Pages) Texas Instruments – Automotive Four-Port USB 3.0 Hub

TUSB8041-Q1
SLLSEE6B – JULY 2014 – REVISED JANUARY 2016
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Table 23. Bit Descriptions – Device Configuration Register 2 (continued)
1
autoModeEnz
0
RSVD
Automatic Mode Enable. This bit is loaded at the de-assertion of reset
with the value of the AUTOENz/HS_SUSPEND pin.
The automatic mode only applies to downstream ports with battery
charging enabled when the upstream port is not connected. Under these
conditions:
RW
0 = Automatic mode battery charging features are enabled.
1 = Automatic mode is disabled; only Battery Charging DCP and
CDP mode is supported.
NOTE: When the upstream port is connected, Battery Charging CDP
mode will be supported on all ports that 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.
RO
Reserved. Read only, returns 0 when read.
8.5.12 USB 2.0 Port Polarity Control Register
Table 24. Register Offset Bh
Bit No.
7
6
5
4
3
2
1
0
Reset State
0
0
0
0
0
0
0
0
Table 25. Bit Descriptions – USB 2.0 Port Polarity Control Register
Bit
Field Name
7
customPolarity
6:5
RSVD
4
p4_usb2pol
3
p3_usb2pol
2
p2_usb2pol
Access
RW
RO
RO/RW
RO/RW
RO/RW
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 OTP ROM.
1 = The p[4:0]_usb2pol bits are read/write 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. Read only, returns 0 when read.
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.
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.
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.
22
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