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2.4.1 RIO buses and GX card
Each DCM provides a GX+ bus that is used to connect to an I/O subsystem. In a fully
populated p5-550, there are two GX+ buses, one from each processor card. Each p5-550 has
one GX+ slot with a single GX+ bus. The GX+ slot is not active unless the second processor
card is installed. It is not required for CUoD processor cards to be activated in order for the
associated GX+ bus to be active. The GX+ cards are hot-pluggable. The p5-550 provides two
external RIO-2 ports that can operate up to 1 GHz. An add-in GX adapter card (Remote I/O
expansion card, FC 1806) when plugged into the GX+ slot adds two more RIO-2 ports. The
RIO-2 ports are used for I/O expansion to external I/O drawers. The supported I/O drawer is
7311 Model D20.
2.5 Internal I/O subsystem
The internal I/O subsystem resides on the system planar, and the SP is packaged on a
separate service processor card. Each card is a separate FRU. There is an internal RIO-2
bus imbedded in the system planar. The system planar contains both the Enterprise RIO-2
hub and the PCI-X Host bridge chip to connect to the integrated I/O packaged on the system
planar. Two RIO-2 ports of the Enterprise hub chip are used for the integrated I/O, and the
remaining two ports are routed to external connectors.
The system planar provides five PCI-X slots and several integrated PCI devices that interface
to two EADS-X chips that function as PCI-X to PCI-X bridges to the primary PCI-X buses on
the PCI-X Host bridge chip.
PCI-X slot 5 can accept a short PCI-X or PCI card and its space is shared with the Remote
I/O expansion card. The remaining PCI-X slots are full length cards. The dual 10/100/1000
Mbps Ethernet adapter is integrated on the system planar.
2.5.1 PCI-X slots and adapters
PCI-X, where the X stands for extended, is an enhanced PCI bus, delivering a bandwidth of
up to 1 GB/sec, running a 64-bit bus at 133 MHz. PCI-X is backward compatible, so the
p5-550 systems can support existing 3.3 volt PCI adapters.
The PCI-X slots in the p5-550 system support hot-plug and Extended Error Handling (EEH).
In the unlikely event of a problem, EEH-enabled adapters respond to a special data packet
generated from the affected PCI-X slot hardware by calling system firmware, which will
examine the affected bus, allow the device driver to reset it, and continue without a system
reboot.
64-bit and 32-bit adapters
IBM offers 64-bit adapter options for the p5-550, as well as 32-bit adapters. Higher-speed
adapters use 64-bit slots because they can transfer 64 bits of data for each data transfer
phase. Generally, 32-bit adapters can function in 64-bit PCI-X slots; however, some 64-bit
adapters cannot be used in 32-bit slots. For a full list of the adapters that are supported on the
p5-550 systems, and for important information regarding adapter placement, see the
Sserver.
http://publib16.boulder.ibm.com/pseries/en_US/infocenter/base/
24
p5-550 Technical Overview and Introduction
Hardware Information Center
. You can find it at:
IBM
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