USB on-the-go high-speed (OTG_HS) RM0033
1098/1381 RM0033 Rev 9
30 USB on-the-go high-speed (OTG_HS)
This section applies to the whole STM32F20x and STM32F21x family, unless otherwise
specified.
30.1 OTG_HS 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_HS
controller.
The following acronyms are used throughout the section:
References are made to the following documents:
• USB On-The-Go Supplement, Revision 1.3
• Universal Serial Bus Revision 2.0 Specification
The OTG_HS is a dual-role device (DRD) controller that supports both peripheral 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 peripheral-only controller, fully
compliant with the USB 2.0 Specification. In host mode, the OTG_HS supports high-speed
(HS, 480 Mbits/s), full-speed (FS, 12 Mbits/s) and low-speed (LS, 1.5 Mbits/s) transfers
whereas in peripheral mode, it only supports high-speed (HS, 480Mbits/s) and full-speed
(FS, 12 Mbits/s) transfers. The OTG_HS supports both HNP and SRP. The only external
device required is a charge pump for VBUS in OTG mode.
30.2 OTG_HS main features
The main features can be divided into three categories: general, host-mode and peripheral-
mode features.
FS full-speed
HS High-speed
LS Low-speed
USB Universal serial bus
OTG On-the-go
PHY Physical layer
MAC Media access controller
PFC Packet FIFO controller
UTMI USB Transceiver Macrocell Interface
ULPI UTMI+ Low Pin Interface
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