HP Integrity rx8640

Chapter 1
HP Integrity rx8640 and HP 9000 rp8440 Server Overview
Detailed Server Description
31
System Backplane
The system backplane board contains the following components:
• Two crossbar chips (XBC)
•Clock generation logic
• Preset generation logic
• Power regulators
• Two local bus adapter (LBA) chips that create internal PCI buses for communicating with the core I/O
card.
The backplane also contains connectors for attaching the cell boards, PCI-X backplane, MP core I/O cards
SCSI cables, bulk power, chassis fans, front panel display, intrusion switches, and external system bus
adapters (SBA) link connectors.
Figure 1-11 System Backplane Block Diagram
PCI-X Backplane
Cell 0
Cell 1
System Backplane
Cell boards are perpendicular
to the system backplane.
XBC XBC
LBA
LBA
Cell 3
Cell 2
Core I/O 0
Core I/O 1