Versatile Application Baseboard for ARM926EJ-S User Guide: 4.23. USB interface

4.23. USB interface

The USB interface is provided by an OTG243 controller that provides an On-The-Go (OTG) dual role device controller. The OTG can function as either a host or slave device.

Table 4.52. USB implementation

Property	Value
Location	Board (an OTG243 chip)
Memory base address	`0x10020000`, the registers in the OTG243 are memory-mapped onto the AHB M2 bus
Interrupt	26 on PIC and SIC
DMA	None
Release version	Custom interface in FPGA to external OTG243 controller
Reference documentation	TransDimension OTG243 Data Sheet (see also USB interface and example programs supplied on the CD)

The OTG243 has the following features:

fully compliant to the USG On-The-Go specification
configurable number of downstream and upstream hosts or functions
USB host is USB 2.0 compliant and supports 12Mb/s and 1.5Mb/s
4KB on-chip RAM.

The OTG243 register base addresses are shown in Table 4.53.

Table 4.53. USB controller base address

Address	Description
`0x10020000`	Chip-level register bank
`0x10020080`	Host controller register bank
`0x10020100`	Function controller register bank

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