Texas Instruments OMAP5912 Reference Manual page 1335

Table 20. HC Root Hub A Register (HCRHDESCRIPTORA) (Continued)
Bit Name
7:0 NDP
SPRU761A
Value Description
Because OMAP5912 does not provide signals from the
USB host controller to control external VBUS switching,
this bit defaults to 0.
Number of downstream ports
This register defaults to 3 to indicate three downstream
ports.
The USB signal multiplexing mode and OMAP5912
top-level pin multiplexing features can place the
OMAP5912 device in a mode where 0, 1, 2, or 3 of the
USB host controller downstream ports are usable. This
register reports three ports, regardless of USB signal
multiplexing mode and OMAP5912 top-level pin
multiplexing mode.
The HC root hub B register defines several aspects of the USB host controller
root hub functionality.
USB Host Controller
Type
Universal Serial Bus (USB)
Reset
R 0x03
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