RM0090: Reference manual - STMicroelectronics

RM0090 USB on-the-go high-speed (OTG_HS)
31.2 OTG_HS main features
The main features can be divided into three categories: general, host-mode and peripheralmode
features.
31.2.1 General features
The OTG_HS interface main features are the following:
● It is USB-IF certified in compliance with the Universal Serial Bus Revision 2.0
Specification
● It supports 3 PHY interfaces
– An on-chip full-speed PHY
– An I 2 C Interface for external full-speed I 2 C PHY
– An ULPI interface for external high-speed PHY.
● It supports the host negotiation protocol (HNP) and the session request protocol (SRP)
● It allows the host to turn VBUS off to save power in OTG applications, with no need for
external components
● It allows to monitor VBUS levels using internal comparators
● It supports dynamic host-peripheral role switching
● It is software-configurable to operate as:
– An SRP-capable USB HS/FS peripheral (B-device)
– An SRP-capable USB HS/FS/low-speed host (A-device)
– An USB OTG FS dual-role device
● It supports HS/FS SOFs as well as low-speed (LS) keep-alive tokens with:
– SOF pulse PAD output capability
– SOF pulse internal connection to timer 2 (TIM2)
– Configurable framing period
– Configurable end-of-frame interrupt
● It embeds an internal DMA with shareholding support and software selectable AHB
burst type in DMA mode
● It has power saving features such as system clock stop during USB suspend, switching
off of the digital core internal clock domains, PHY and DFIFO power management
● It features a dedicated 4-Kbyte data RAM with advanced FIFO management:
– The memory partition can be configured into different FIFOs to allow flexible and
efficient use of RAM
– Each FIFO can contain multiple packets
– Memory allocation is performed dynamically
– The FIFO size can be configured to values that are not powers of 2 to allow the
use of contiguous memory locations
● It ensures a maximum USB bandwidth of up to one frame without application
intervention
Doc ID 018909 Rev 3 1156/1416