RM0033 Rev 9 957/1381
RM0033 USB on-the-go full-speed (OTG_FS)
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29 USB on-the-go full-speed (OTG_FS)
This section applies to the whole STM32F20x and STM32F21x family, unless otherwise
specified.
29.1 OTG_FS 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 this 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_FS 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. In host mode, the OTG_FS supports full-speed
(FS, 12 Mbits/s) and low-speed (LS, 1.5 Mbits/s) transfers whereas in device mode, it only
supports full-speed (FS, 12 Mbits/s) transfers. The OTG_FS supports both HNP and SRP.
The only external device required is a charge pump for V
BUS
in host 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)
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