Host-Mode Features - ST STM32L4x6 Reference Manual

USB on-the-go full-speed (OTG_FS)
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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
• 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 (1 ms) without system
intervention
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It supports charging port detection as described in Battery Charging Specification
Revision 1.2
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It supports Attach Detection Protocol (ADP)
43.2.2

Host-mode features

The OTG_FS interface main features and requirements in host-mode are the following:
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External charge pump for V
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Up to 12 host channels (pipes): each channel is dynamically reconfigurable to allocate
any type of USB transfer.
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Built-in hardware scheduler holding:
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Management of a shared Rx FIFO, a periodic Tx FIFO and a nonperiodic Tx FIFO for
efficient usage of the USB data RAM.
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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
SOF pulse internal connection to timer (TIMx)
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
Up to 12 interrupt plus isochronous transfer requests in the periodic hardware
queue
Up to 12 control plus bulk transfer requests in the non-periodic hardware queue
DocID024597 Rev 3
off to conserve battery power in OTG applications
BUS
levels with internal comparators
BUS
voltage generation.
BUS
RM0351