1
Download M3 32-bit MCU User Manual
Transcript
GD32F10x User Manual 24. Universal serial bus on-the-go Full-Speed interface (USB OTG_FS) 24.1. Introduction USB On-The-Go Full-Speed (OTG_FS) controller is fully compliant with the On-The-Go Supplement to the USB 2.0 Specification which can augment the capability of communicating with existing mobile devices and USB peripherals by adding host functionality. It can operate as device-only function controller which only supports Full-Speed (FS, 12Mbits/s) transfers or host-only function controller which supports Full-Speed (FS, 12Mbits/s) and Low-Speed (LS, 1.5Mbits/s) transfers. The controller is actually a dual-role device (DRD) controller which can operate as host or device during point-to-point communications with USB Host, Device, or OTG equipment. It fully supports the OTG standard’s session request protocol (SRP) and host negotiation protocol (HNP). 24.2. Main features The main features include three categories: general, host-mode and device-mode features. 24.2.1. General features Fully compliant with the On-The-Go Supplement to the USB 2.0 Specification In PHY, it includes fully support for the optional protocol detailed in the On-The-Go Supplement Rev 1.3 specification – Supports the insertion A-B type device identification (USB ID line) – Supports Host Negotiation Protocol (HNP) and Session Request Protocol (SRP) – Allows host to turn VBUS off to conserve battery power in OTG applications – Supports VBUS level detection with internal comparators – Supports dynamic switching between host and device roles It can be configured by software to operate as: – USB OTG_FS dual role device (host or device) – USB FS/LS host (A-device) – USB FS Peripheral (B-device) It supports SOF (at FS) and keep-alive (at LS) by 752
