Functional Architecture
SE7500CW2 Server Board Technical Product Specification
14
Revision 1.40
3.2.4.1
PCI Bus P32-A I/O Subsystem
The ICH3-S provides a legacy 32-bit PCI subsystem and acts as the central resource on this
PCI interface.
P32-A supports the following embedded devices and connectors:
•
An ATI* Rage* XL video controller with 3D/2D graphics accelerator
•
Promise Technology* PDC20267 dual channel ATA-100 RAID controller.
•
Two Intel 82550PM network controllers
•
Two 5V keyed expansion slots capable of supporting full length PCI add-in cards
operating at 33MHz
3.2.4.2
PCI Bus Master IDE Interface
The ICH3-S acts as a PCI-based Ultra DMA/100 IDE controller that supports programmed I/O
transfers and bus master IDE transfers. The ICH3-S supports two IDE channels, supporting two
drives each (drives 0 and 1). The Intel Server Board SE7500CW2 provides two SSI compliant
40-pin (2x20) IDE connectors to access the IDE functionality.
The Intel Server Board SE7500CW2 IDE interface supports Ultra DMA/100 Synchronous DMA
Mode transfers on each 40 pin connector.
3.2.4.3
USB Interface
The ICH3-S contains three USB revision 1.1 controllers and four USB hubs. The USB controller
moves data between main memory and the six USB connectors. All six ports function identically
and with the same bandwidth. The Intel Server Board SE7500CW2 implements 4 of the 6 ports
on the board.
The Intel Server Board SE7500CW2 provides three external USB ports on the back side of the
server board. The triple stack USB connector is located within the standard ATX I/O panel area
next to the keyboard and mouse housing. The USB specification defines the external
connectors.
The fourth USB ports is optional and can be accessed by cabling from the internal 9-pin
connector located on the baseboard to external USB ports located either in front or the rear of a
given chassis.
3.2.4.4
Compatibility Interrupt Control
The ICH3-S provides the functionality of two 82C59 PIC devices for ISA-compatible interrupt
handling.
3.2.4.5
APIC
The ICH3-S integrates an APIC that is used to distribute 24 interrupts.