RM0090: Reference manual - STMicroelectronics

USB on-the-go full-speed (OTG_FS) RM0090
30.2.2 Host-mode features
The OTG_FS interface main features and requirements in host-mode are the following:
● External charge pump for V BUS voltage generation.
● Up to 8 host channels (pipes): each channel is dynamically reconfigurable to allocate
any type of USB transfer.
● Built-in hardware scheduler holding:
– Up to 8 interrupt plus isochronous transfer requests in the periodic hardware
queue
– Up to 8 control plus bulk transfer requests in the non-periodic hardware queue
● Management of a shared RX FIFO, a periodic TX FIFO and a nonperiodic TX FIFO for
efficient usage of the USB data RAM.
30.2.3 Peripheral-mode features
The OTG_FS interface main features in peripheral-mode are the following:
● 1 bidirectional control endpoint0
● 3 IN endpoints (EPs) configurable to support Bulk, Interrupt or Isochronous transfers
● 3 OUT endpoints configurable to support Bulk, Interrupt or Isochronous transfers
● Management of a shared Rx FIFO and a Tx-OUT FIFO for efficient usage of the USB
data RAM
● Management of up to 4 dedicated Tx-IN FIFOs (one for each active IN EP) to put less
load on the application
● Support for the soft disconnect feature.
1019/1416 Doc ID 018909 Rev 3