Pci And Card Enclosure Concepts - IBM AS/400e User Handbook Manual

PCI Card Placement Rules

PCI and Card Enclosure Concepts

There are several concepts in the PCI implementation that are new to the AS/400
environment. These concepts need to be understood to create and install valid
configurations.
For the purpose of this chapter, the term Multi-Adapter Bridge Bus Number is used to
facilitate the explanation of PCI card plugging rules.
A Multi-Adapter Bridge defines a logical grouping of card slots in the card enclosure. Each
Multi-Adapter Bridge contains eight Multi-Adapter Bridge Buses numbered 1 to 8. The
sequence does not necessarily correspond with the sequence of card slots in the card
enclosure. For example, in the Model 270 diagram on page 281, the embedded IOP is PCI
bus 1, slot C07 is Multi-Adapter Bridge Bus 2, slot C01 is PCI bus 3, and slot C06 is PCI bus
4. An IOP addresses the IOAs in sequence by the PCI bus number, not the slot number.
Using the previous example, the Model 270 Embedded IOP would control the IOAs installed
in slots C07 and C01 and could control an IOA installed in slot C06 and C05. PCI card
installation instructions refer to the slot number and not to the Multi-Adapter Bridge Bus
number.
All card enclosures except the Model 270 contain more than one Multi-Adapter Bridge. The
divide between these Multi-Adapter Bridges is called a Multi-Adapter Bridge Boundary . An
IOP may control a maximum of four IOAs installed in higher number Multi-Adapter Bridge
Buses, up to another IOP or a Multi-Adapter Bridge Boundary. An IOP must be installed in
Multi-Adapter Bridge Bus 1 of a Multi-Adapter Bridge. The Model 270, Model 820, and #5075
Expansion Unit have an IOP embedded on the backplane of the card enclosure that occupies
Multi-Adapter Bridge Bus 1 of the first, and in the case of the Model 270 only, Multi-Adapter
Bridge.
On all card enclosures except the Model 270, some slots are 32-bit and other slots are 64-bit.
The Model 270 supports 32-bit slots only. When planning for the installation of IOPs and IOAs
in the card enclosure, it is required that 64-bit cards only be installed in 64-bit slots with the
exception of the Model 270. At the time this edition was published, the #2743 was the only
64-bit IOA offered for the AS/400 system. In the Card Enclosure diagrams on page 281, any
card slots that have a single Multi-Adapter Bridge Bus number are 32-bit slots. Card slots that
have dual Multi-Adapter Bridge Bus numbers are 64-bit slots.
Certain slots on the Model 270, Model 820, and #5075 Expansion Unit card enclosures on
page 281 are labeled "short". These slots have part of the card slot blocked in the card
enclosure. Therefore, only short cards may be installed in these positions. An example is slot
C07 in the Model 270 card enclosure. See "Hard Rules: IOA Capabilities" on page 286, for
information on which cards are "long" cards and may not be installed in the "short" positions.
When an Integrated Netfinity Server is installed, it occupies two and a half slots except on the
Model 270 where it occupies one and a half slots. This means that the card slot immediately
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AS/400e System Handbook