VAR-320SBC Reference Guide
Copyright © 2008 Variscite
4.11. USB
4.11.1. USB 1.1 Full speed OTG and Client Controller
The UDC supports 24 endpoints (Endpoint 0 plus 23 programmable endpoints). The UDC is a
USB revision 1.1 compliant, full-speed device that operates half-duplex at a baud rate of 12 Mbps
(as a slave only, not a host or hub controller).
Signal
Pin number Type
Description
USB_OTG_P P1-136
I/O
USB OTG Positive
USB_OTG_P P1-138
I/O
USB OTG Negative
24
4.11.2. Universal
Serial Bus Host Controller
The Universal Serial Bus (USB) supports serial data exchanges between a host computer and a
variety of simultaneously-accessible peripherals. The attached peripherals share USB bandwidth
through a host-scheduled, token-based protocol. Peripherals can be attached, configured, used,
and detached, while the host and other peripherals continue operation.
Features:
•
USB Rev. 1.1 compatible
•
Supports both low-speed and full-speed USB devices
•
Open Host Controller Interface (OHCI) Rev 1.0a compatible
•
Root hub supports three downstream ports
Signal
Pin number
Type Description
USBH_N P2-64
I/O
USB Full Speed Host Port 1 Positive Line
USBH_P P2-66
I/O
USB Full Speed Host Port 1 Negative Line