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1
Overview
2
USB Host Controller
SPRU761A
Universal Serial Bus (USB)
This document describes the universal serial bus (USB) host on the
OMAP5912 multimedia processor.
The OMAP5912 processor provides several varieties of USB functionality,
including:
-
USB host: OMAP5912 provides a three-port USB Specification Revision
1.1-compliant host controller, which is based on the OHCI Specification for
USB Release 1.0a.
-
USB device: OMAP5912 provides a full-speed USB device.
-
USB On-The-Go (OTG): OMAP5912 acts as an OTG dual-role device; the
USB device functionality and one port of the USB host controller act in
concert to provide an OTG port.
Flexible multiplexing of signals from the OMAP5912 USB host controller, the
OMAP5912 USB function controller, and other OMAP5912 peripherals allow
a wide variety of system-level USB capabilities. Many of the OMAP5912 pins
can be used for USB-related signals or for signals from other OMAP5912
peripherals. The OMAP5912 top-level pin multiplexing controls each pin
individually to select one of several possible internal pin signal
interconnections. When these shared pins are programmed for use as USB
signals, the OMAP5912 USB signal multiplexing selects how the signals
associated with the three OMAP5912 USB host ports and the OMAP5912
USB function controller can be brought out to OMAP5912 pins.
The OMAP5912 USB host controller (HC) is a three-port controller that
communicates with USB devices at the USB low-speed (1.5M bit-per-second
maximum) and full-speed (12M bit-per-second maximum) data rates. It is
compatible with the Universal Serial Bus Specification Revision 2.0 and the
Open HCI—Open Host Controller Interface Specification for USB, Release
1.0a, available through the Compaq Computer Corporation web site, and
hereafter called the OHCI Specification for USB. It is assumed that users of
Universal Serial Bus (USB)
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