Table 1-7 PCI-X Slot Boot Paths Cell 1 (continued)
PathRopesPCI SlotCell
1/0/14/1/014/1541
1/0/6/1/06/751
1/0/4/1/04/561
1/0/2/1/02/371
1/0/1/1/0181
The server supports two internal SBAs. Each SBA provides the control and interfaces for eight
PCI-X slots. The interface is through the rope bus (16 ropes per SBA). For each SBA, the ropes
are divided in the following manner:
• A single rope is routed to support the core I/O boards through LBAs located on the system
backplane.
• A single rope is routed to an LBA on the PCI backplane to support a slot for PCI and PCI-X
cards (slot 8).
• Six ropes are bundled into double ropes to three (3) LBAs. They support slots 1, 2, and 7 for
PCI and PCI-X mode 1 cards.
• Eight fat ropes are bundled into quad ropes to four (4) LBAs. They support slots 3, 4, 5, and
6 for PCI and PCI-X mode 2 cards.
NOTE: PCI-X slots 1-7 are dual rope slots while slot 8 is a single rope slot. A rope is defined as
a high-speed, point-to-point data bus.
Each of the 16 slots is capable of 33 MHz/66 MHz PCI or 66 MHz/133 MHz PCI-X. Four slots in
PCI-X support 266 MHz. All 16 PCI slots are keyed for 3.3 V connectors (accepting both Universal
and 3.3 V cards). The PCI-X backplane does not provide any 5 V slots for the I/O cards. Table 1-8
summarizes the PCI-X slot types.
The PCI-X backplane is physically one board, yet it behaves like two independent partitions.
SBA 0 and its associated LBAs and eight PCI-X slots form one I/O partition. SBA 1 and its
associated LBAs and eight PCI-X slots form the other I/O partition. One I/O partition can be reset
separately from the other I/O partition but cannot be powered down independently.
26 HP Integrity rx8640 and HP 9000 rp8440 Server Overview
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