HP Integrity rx8640, HP 9000 rp8440 Server User Service Guide

You can remove the core I/O cards from the system as long as you shut down the partition for the
core I/O card before removing the card. The hot-plug circuitry that enables this feature is located
on the system backplane near the core I/O sockets.
System Backplane to PCI-X Backplane Connectivity
The PCI-X backplane uses two connectors for the SBA link bus and two connectors for the high-speed
data signals and the manageability signals.
SBA link bus signals are routed through the system backplane to the cell controller on each
corresponding cell board.
The high-speed data signals are routed from the SBA chips on the PCI-X backplane to the two LBA
PCI bus controllers on the system backplane.
Clocks and Reset
The system backplane contains reset and clock circuitry that propagates through the whole system.
The system backplane central clocks drive all major chip set clocks. The system central clock circuitry
features redundant, hot-swappable oscillators.
PCI/PCI-X I/O Subsystem
The cell board to the PCI-X board path runs from the CC to the SBA, from the SBA to the ropes,
from the ropes to the LBA, and from the LBA to the PCI slots. The CC on cell board 0 and cell board
1 communicates through an SBA over the SBA link. The SBA link consists of both an inbound and
an outbound link with a peak bandwidth of approximately 11.5 GB/s at 3.2 GT/s. The SBA
converts the SBA link protocol into “ropes.” A rope is defined as a high-speed, point-to-point data
bus. The SBA can support up to 16 of these high-speed bidirectional rope links for a total aggregate
bandwidth of approximately 11.5 GB/s.
There are LBA chips on the PCI-X backplane that act as a bus bridge, supporting either one or two
ropes for PCI-X 133 MHz slots and the equivalent bandwidth of four ropes for PCI-X 266 slots.
Each LBA acts as a bus bridge, supporting one or two ropes and capable of driving 33 MHz or
66 MHz for PCI cards. The LBAs can also drive at 66 MHz or 133 MHz for PCI-X mode 1 cards,
and at 266 MT/s for PCI-X mode 2 cards installed in mode 2 capable slots. When cell board 2
and cell board 3 are present, the cell boards attach to their own associated SBA and LBA chips
on the PCI-X board in the Server Expansion Unit.
Table 5 and Table 6 list the mapping of PCI-X slots to boot paths. The cell column refers to the cell
boards installed in the server.
Table 5 PCI-X Slot Boot Paths Cell 0
PathRopesPCI SlotCell
0/0/8/1/08/910
0/0/10/1/010/1120
0/0/12/1/012/1330
0/0/14/1/014/1540
0/0/6/1/06/750
0/0/4/1/04/560
0/0/2/1/02/370
0/0/1/1/0180
20 HP Integrity rx8640 Server Overview