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High-Speed USB Host Subsystem
Table 22-22. OTG_BIGENDIAN
Address Offset
0x0000 0418
Physical Address
Instance
USBHS
See
Description
Enable BIG ENDIANESS for OCP MASTER
Type
RW
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
RESERVED
BIG_ENDIAN
Bits
Field Name
Description
Type
Reset
31:1
RESERVED
Reserved
R
0x0000 0000
0
BIG_ENDIAN
Enable BIG ENDIAN in OCP MASTER
RW
0x0
0x0 Little Endian
0x1 Big Endian
Table 22-23. Register Call Summary for Register OTG_BIGENDIAN
High-Speed USB OTG Controller
•
High-Speed USB OTG Controller Registers
22.2 High-Speed USB Host Subsystem
NOTE:
Copyright ©2004,2005, 2006, 2007, 2008 Synopsys, Inc. All rights reserved. Used with
permission.
22.2.1 High-Speed USB Host Subsystem Overview
The high-speed universal serial bus (USB) host subsystem is composed of the high-speed multiport USB
host controller and the USBTLL module.
The USB controller is a high-speed multiport USB2.0 host controller. It contains two independent, 3-port
host controllers that operate in parallel:
•
The EHCI controller, based on the Enhanced Host Controller Interface (EHCI) specification for USB
Release 1.0, is in charge of high-speed traffic (480M bit/s), over the ULPI/UTMI interface
•
The OHCI controller, based on the Open Host Controller Interface (OHCI) specification for USB
Release 1.0a, is in charge of full-speed/low-speed traffic (12/1.5M bit/s, respectively), over a serial
interface
Each of the three device external ports is owned by exactly one and only one of the controllers at any
time.
The USBTLL module is a high-speed USB UTMI low-pin interface (ULPI) transceiverless link logic (TLL)
adapter. It implements a TLL compatible with a number of USB standard interface protocols. It consists of
three channels, defined as independent USB path through the TLL module, which always converts the
UTMI+ PHY interface protocol coming from the high-speed USB host controller.
Each USB port (1, 2, and 3) can connect either to an external-to-device chip USB transceiver or directly
using a transceiverless link to an external integrated circuit (IC) supporting the same TLL protocol.
highlights the high-speed USB host subsystem.
3233
SWPU177N – December 2009 – Revised November 2010
High-Speed USB Host Subsystem and High-Speed USB OTG Controller
Copyright © 2009–2010, Texas Instruments Incorporated