Agp; Usb; Usb Port Configuration - Intel D845PEBT2 Specification

Intel Desktop Board D845PEBT2 Technical Product Specification

1.7.1 AGP

AGP is a high-performance interface for graphics-intensive applications, such as 3D applications.
While based on the PCI Local Bus Specification, Rev. 2.2, AGP is independent of the PCI bus and
is intended for exclusive use with graphical display devices. AGP overcomes certain limitations of
the PCI bus related to handling large amounts 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 efficiency
✏
NOTES
•
The AGP connector is keyed for 1.5 V Switching Voltage Level (SVL) AGP cards only; the
connector is not mechanically compatible with legacy 3.3 V AGP cards. Do not attempt to
install a legacy 3.3 V AGP card.
•
Install memory in the DIMM sockets prior to installing the AGP video card to avoid
interference with the memory retention mechanism.
For information about
The location of the AGP connector
The signal names of the AGP connector
Obtaining the Accelerated Graphics Port Interface Specification

1.7.2 USB

The Desktop Board D845PEBT2 supports up to six USB 2.0 ports, fully supports UHCI and EHCI,
and uses UHCI- and EHCI-compatible drivers.
The ICH4 provides the USB controller for all ports, as shown in Figure 4. The port arrangement is
as follows:
•
Two ports are implemented with stacked back panel connectors, adjacent to the PS/2
connectors
•
Two ports are implemented with stacked back panel connectors, adjacent to the audio
connectors
•
Two ports are routed to the front panel USB connector
82801DB
I/O Controller Hub
(ICH4)
24
USB USB ports (2)
USB USB ports (2)
USB USB ports (2)
Figure 4. USB Port Configuration
Refer to
Figure 1, page 14
Table 38, page 64
Section 1.4, page 17
Back panel USB connectors
adjacent to the PS/2 ports
Back panel USB connectors
adjacent to the audio connectors
Front panel USB connectors
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