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Processor and Chipset Intel® Server Board SDS2
Revision 1.2
Order Number: A85874-002
10
3.3.2 CIOB20 Champion I/O Bridge
The Champion I/O Bridge (CIOB) is a 352-pin ball-grid array device and provides an integrated
I/O bridge that provides a high-performance data flow path between the IMBus and the 64-bit I/O
subsystem. This subsystem supports peer 64-bit PCI segments. Because it has multiple PCI
interfaces, the CIOB can provide large and efficient I/O configurations. The CIOB functions as
the bridge between the IMBus and the multiple 64-bit PCI I/O segments.
The IMBus interface can support 512 MB/s of data bandwidth in both the upstream and
downstream direction simultaneously.
The internal PCI arbiter implements the Least Recently used algorithm to grant access to
requesting masters.
3.3.2.1 PCI Bus P64-B I/O Subsystem
P64-B supports two 64-bit, 66-MHz 3.3V full-length PCI slots.
3.3.2.2 PCI Bus P64-C I/O Subsystem
P64-C supports the following embedded devices and connectors:
• Dual Channel Wide Ultra160 SCSI controller: Adaptec* AIC-7899W
• Two 64-bit, 66-MHz 3.3V full length PCI Slots
3.3.3 CSB5 South Bridge
Please refer to Section 4.5 for information on CSB5.