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USB on-the-go full-speed (OTG_FS) RM0008

802/1096 Doc ID 13902 Rev 12

28 USB on-the-go full-speed (OTG_FS)

Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx

microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.

Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx

microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.

High-density devices are STM32F101xx and STM32F103xx microcontrollers where the

Flash memory density ranges between 256 and 512 Kbytes.

XL-density devices are STM32F101xx and STM32F103xx microcontrollers where the

Flash memory density ranges between 768 Kbytes and 1 Mbyte.

Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.

This section applies only to STM32F105xx and STM32F107xx connectivity line devices.

28.1 OTG_FS introduction

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 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)

ST STM32F101xx User Manual

Questions and Answers: