Otg_Fs Main Features; General Features - ST STM32F205 series Reference Manual

RM0033
29.2

OTG_FS main features

The main features can be divided into three categories: general, host-mode and device-
mode features.
29.2.1

General features

The OTG_FS interface general features are the following:
•
It is USB-IF certified to the Universal Serial Bus Specification Rev 2.0
•
It includes full support (PHY) for the optional On-The-Go (OTG) protocol detailed in the
On-The-Go Supplement Rev 1.3 specification
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• It is software-configurable to operate as:
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• It supports FS SOF and LS Keep-alives with
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It includes power saving features such as system stop during USB Suspend, switch-off
of clock domains internal to the digital core, PHY and DFIFO power management
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It features a dedicated RAM of 1.25 Kbytes with advanced FIFO control:
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• It guarantees max USB bandwidth for up to one frame (1ms) without system
intervention
Integrated support for A-B Device Identification (ID line)
Integrated support for host Negotiation Protocol (HNP) and Session Request
Protocol (SRP)
It allows host to turn V
It supports OTG monitoring of V
It supports dynamic host-peripheral switch of role
SRP capable USB FS Peripheral (B-device)
SRP capable USB FS/LS host (A-device)
USB On-The-Go Full-Speed Dual Role device
SOF pulse PAD connectivity (OTG_FS_SOF)
SOF pulse internal connection to timer2 (TIM2)
Configurable framing period
Configurable end of frame interrupt
Configurable partitioning of RAM space into different FIFOs for flexible and
efficient use of RAM
Each FIFO can hold multiple packets
Dynamic memory allocation
Configurable FIFO sizes that are not powers of 2 to allow the use of contiguous
memory locations
USB on-the-go full-speed (OTG_FS)
off to conserve battery power in OTG applications
BUS
levels with internal comparators
BUS
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