Texas Instruments OMAP5912 Reference Manual page 1336

USB Host Controller
Table 21. HC Root Hub B Register (HCRHDESCRIPTORB)
Bit Name
31:16 PPCM
15 :0 DR
44 Universal Serial Bus (USB)
Description
Port power control mask
Each bit defines whether a corresponding downstream port
has port power controlled by the global power control. If set,
per-port power control is implemented for the corresponding
port. If clear, global power control is implemented for the
corresponding port.
PPCM bit 0 is reserved.
PPCM bit 1 is the port power control mask for downstream
port 1.
PPCM bit 2 is the port power control mask for downstream
port 2.
PPCM bit 3 is the port power control mask for downstream
port 3.
PPCM bits 4 through 15 are reserved.
OMAP5912 does not provide connections from the USB host
controller to pins to provide external port power switching.
Systems that implement port power switching must use other
mechanisms to control port power.
System software can update these bits to simplify host
controller driver and/or OTG driver coding.
Device removable
Each bit defines whether a corresponding downstream port
has a removable or non-removable device. A cleared bit
indicates the corresponding port may have a removable
device attached. A set bit indicates that the corresponding
port has a non-removable device attached.
DR bit 0 is reserved.
DR bit 1 is the device removable bit for downstream port 1.
DR bit 2 is the device removable bit for downstream port 2.
DR bit 3 is the device removable bit for downstream port 3.
DR bits 4 through 15 are reserved.
The HC root hub status register reports the USB host controller root hub status.
Type Reset
R/W 0x0000
R/W 0x0000
SPRU761A