Figure 671. Usb Peripheral Block Diagram - ST STM32G4 Series Reference Manual

Advanced arm-based 32-bit mcus

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Universal serial bus full-speed device interface (USB)

USB functional description

APB interface

The USB peripheral provides an USB-compliant connection between the host PC and the

function implemented by the microcontroller. Data transfer between the host PC and the

system memory occurs through a dedicated packet buffer memory accessed directly by the

USB peripheral. This dedicated memory size is 1024 bytes, and up to 16 mono-directional

or 8 bidirectional endpoints can be used. The USB peripheral interfaces with the USB host,

detecting token packets, handling data transmission/reception, and processing handshake

packets as required by the USB standard. Transaction formatting is performed by the

hardware, including CRC generation and checking.

Each endpoint is associated with a buffer description block indicating where the

endpoint-related memory area is located, how large it is or how many bytes must be

transmitted. When a token for a valid function/endpoint pair is recognized by the USB

peripheral, the related data transfer (if required and if the endpoint is configured) takes

shows the block diagram of the USB peripheral.

Figure 671. USB peripheral block diagram

RM0440 Rev 4

registers and logic

registers and logic

IRQs to NVIC

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