RM0402 Rev 6 967/1163
RM0402 USB on-the-go full-speed (OTG_FS)
1122
29 USB on-the-go full-speed (OTG_FS)
29.1 Introduction
Portions Copyright (c) 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 196: 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)
LPM Link power management
BCD Battery charging detector
HNP Host negotiation protocol
SRP Session request protocol
Table 196. OTG_FS speeds supported
- HS (480 Mb/s) FS (12 Mb/s) LS (1.5 Mb/s)
Host mode - X X
Device mode - X -
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