User's Manual

Product Description
19
1.6.1 Direct AGP
Direct (integrated) AGP is a high-performance bus (independent of the PCI bus) for
graphics-intensive applications, such as 3-D applications. AGP overcomes certain limitations of
the PCI bus related to handling large amount of graphics data with the following features:
• Pipelined memory read and write operations that hide memory access latency
• Demultiplexing of address and data on the bus for nearly 100 percent bus efficiency
For information about Refer to
The location of the VGA port connector Figure 4, page 39
Obtaining the Accelerated Graphics Port Interface Specification Table 2, page 13
1.6.2 USB
The board supports up to four USB ports; one USB peripheral can be connected to each port. For
more than four USB devices, an external hub can be connected to any of the ports. Two USB ports
are implemented with stacked back panel connectors. The other two ports can be routed from the
connector at location J7A1 via a cable to the front panel. The board fully supports UHCI and uses
UHCI-compatible software drivers. USB features include:
• Support for self-identifying peripherals that can be connected or disconnected while the
computer is running
• Automatic mapping of function to driver and configuration
• Support for isochronous and asynchronous transfer types over the same set of wires
• Support for up to 127 physical devices
• Guaranteed bandwidth and low latencies appropriate for telephony, audio, and other
applications
• Error-handling and fault-recovery mechanisms built into the protocol
✏
NOTE
Computer systems that have an unshielded cable attached to a USB port may not meet FCC
Class B requirements, even if no device or a low-speed USB device is attached to the cable. Use
shielded cable that meets the requirements for full-speed devices.
For information about Refer to
The location of the USB connectors on the back panel Figure 4, page 39
The signal names of the USB connectors Table 17, page 40
The location of the USB port connector for the front panel Figure 6, page 46
The signal names for the USB port connector for the front panel Table 30, page 47
The USB and UHCI specifications Table 2, page 13