Texas Instruments OMAP5912 Reference Manual page 1334

USB Host Controller
Table 20. HC Root Hub A Register (HCRHDESCRIPTORA) (Continued)
Bit Name
11 OCPM
10 DT
9 NPS
8 PSM
42 Universal Serial Bus (USB)
Value Description
Overcurrent protection mode
OMAP5912 does not provide host controller
overcurrent protection input signals, so this bit has no
effect. This bit has no relationship to the OTG controller
register bits that relate to VBUS.
Device type
This bit is always 0, which indicates that the USB host
controller implemented is not a compound device.
No power switching
0 Indicates that VBUS power switching is supported and
is either per-port or all-port switched per the power
switching mode field.
1 Indicates that VBUS power switching is not supported
and that power is available to all downstream ports
when the USB host controller is powered.
Because OMAP5912 does not provide connections
from the USB host controller to control external VBUS
switching, this bit defaults to 1.
This bit has no relationship to the OTG controller
register bits that relate to VBUS. System software can
update this register to simplify host controller driver
and/or OTG driver coding.
Power switching mode
0 Indicates that all ports are powered at the same time
1 Indicates that individual port power switching is
supported
Type Reset
R/W 0
R 0
R/W 1
R/W 0
SPRU761A