USB on-the-go full-speed (OTG_FS) RM0351
1620/1830 DocID024597 Rev 5
47 USB on-the-go full-speed (OTG_FS)
47.1 Introduction
Portions Copyright (c) 2004, 2005 Synopsys, Inc. All rights reserved. Used with permission.
This section presents the architecture and the programming model of the OTG_FS
controller.
The following acronyms are used throughout the section:
References are made to the following documents:
• USB On-The-Go Supplement, Revision 2.0
• Universal Serial Bus Revision 2.0 Specification
• USB 2.0 Link Power Management Addendum Engineering Change Notice to the USB
2.0 specification, July 16, 2007
• Errata for USB 2.0 ECN: Link Power Management (LPM) - 7/2007
• Battery Charging Specification, Revision 1.2
The USB OTG is a dual-role device (DRD) controller that supports both device and host
functions and is fully compliant with the On-The-Go Supplement to the USB 2.0
Specification. It can also be configured as a host-only or device-only controller, fully
compliant with the USB 2.0 Specification. OTG_FS supports the speeds defined in the
Table 300: OTG_FS speeds supported below.The USB OTG supports both HNP and SRP.
The only external device required is a charge pump for V
BUS
in OTG mode.
FS Full-speed
LS Low-speed
MAC Media access controller
OTG On-the-go
PFC Packet FIFO controller
PHY Physical layer
USB Universal serial bus
UTMI USB 2.0 Transceiver Macrocell interface (UTMI)
UTMI USB Transceiver Macrocell Interface
ULPI UTMI+ Low Pin Interface
ADP Attach detection protocol
LPM Link power management
BCD Battery charging detector
HNP Host negotiation protocol
SRP Session request protocol
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