Allwinner A20 - 6.8. USB Host

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6.8. USB Host

6.8.1. Overview

USB Host controller is fully compliant with the USB 2.0 specification, Enhanced Host Controller

Interface (EHCI) Specification, Revision 1.0, and the Open Host Controller Interface (OHCI)

Specification Release 1.0a. The controller supports high-speed, 480-Mbps transfers (40 times faster

than USB 1.1 full-speed mode) using an EHCI Host controller, as well as full and low speed through

one or more integrated OHCI host controllers.

The USB host controller features:

 Support industry-standard AMBA High-Performance Bus (AHB) and it is fully compliant with the

AMBA Specification, Revision 2.0. Supports bus.

 Support 32-bit Little Endian AMBA AHB Slave bus for register access

 Support 32-bit Little Endian AMBA AHB Master bus for memory access.

 Include an internal DMA Controller for data transfer with memory.

 Comply with Enhanced Host Controller Interface (EHCI) Specification, Version 1.0, and the Open

Host Controller Interface (OHCI) Specification, Version 1.0a.

 Support High-Speed (HS, 480-Mbps), Full-Speed (FS, 12-Mbps), and Low-Speed (LS, 1.5-Mbps)

device

 Support the UTMI+ Level 3 interface. The 8-bit bidirectional data buses are used.

 Support only 1 USB Root Port shared between EHCI and OHCI

 The USB HOST system contains two HCI controllers. The HCI controllers are composed of an

EHCI controller and an OHCI companinon controller.