Table 1-4 PCI-X Paths Cell 1
PathI/O ChassisPCI-X SlotCell
1/0/8/1111
1/0/10/1121
1/0/12/1131
1/0/14/1141
1/0/6/1151
1/0/4/1161
1/0/2/1171
1/0/1/1181
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 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 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.
The PCI-X backplane is the primary I/O interface for the server. It provides 16, 64-bit, hot-plug
PCI/PCI-X slots. Fourteen of the slots have dual ropes connected to the LBA chips. The remaining
two slots have a single rope connected to each LBA chip. Each of the sixteen slots are capable of
66 MHz/33 MHz PCI or 133 MHz/66 MHz PCI-X. Four slots in PCI-X support 266 MHz. All
sixteen PCI slots are keyed for 3.3 volt connectors (accepting both Universal and 3.3 V cards).
See Table 1-5 for more details.
The PCI-X backplane is physically one board, but it behaves like two independent partitions.
SBA 0, its associated LBAs, and eight PCI-X slots form one I/O partition. SBA 1, 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.
IMPORTANT: Always refer to the PCI card’s manufacturer for the specific PCI card performance
specifications. PCI, PCI-X mode 1, and PCI-X mode 2 cards are supported at different clock
speeds. Select the appropriate PCI-X I/O slot for best performance.
Table 1-5 lists the PCI-X slot types supported on the server.
Detailed Server Description 31
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