Magma 7 Slot Series Spezifikationen PDF herunterladen (Seite 34)

buses. Similarly, lower numbered buses are termed to be "upstream" of

higher numbered buses.

Each PPB has a primary side (which is attached to the "upstream" or

lower numbered PCI bus), and a secondary side (which is attached to

the "downstream" or higher numbered PCI bus). In the case of the

MAGMA PCI Expansion System, the PCI host interface card, which is

plugged into an available slot on your host computer, has at its

"upstream" side (Bus 0) and at its "downstream" side the cable (Bus 1).

The PCI expansion interface also has a PPB on board and its

"upstream" side is attached to the cable bus (Bus 1) and its

"downstream" side is attached to the expansion motherboard (Bus 2).

Inserting a host interface into an available slot in the motherboard

results in its primary bus being at (Bus 2), its secondary bus (the cable

bus) being at (Bus 3) and the PCI expansion interface in the second

motherboard is (Bus 4).

PCI Card Conflicts

If you determine that one PCI card is interfering with the operation of

another card, first try reorganizing the cards on the motherboard.

Moving the cards around can change the order in which the cards are

configured by the system firmware (whether console code or BIOS

code) and will go a long way toward resolving module conflicts.

Console Firmware Issues

Different systems have different names for their console firmware. On

an IBM-PC compatible the firmware is referred to as the system's

"BIOS" code. For a SUN workstation the computer console code is

called OBP (OpenBootProm). For a Macintosh computer the console

code is called "OpenFirmware" code. Regardless of what it's called, the

console firmware will perform the same basic set of functions. In a

nutshell, the console firmware must provide a set of hardware or

architecture-specific functions and routines that are called during the

early phases of system startup. Specifically, these functions and

callable routines allow the PCI devices in a host computer to be

recognized and configured for use by the soon-to-be-running system.

The portion of the PCI Local Bus Specification that directly addresses

this class of code is the PCI BIOS Specification. A similar specification

for use by systems that are not IBM-PC compatible is the IEEE 1275-

1994 OpenFirmware Bus Binding Specification. These two different

specifications are complimentary and form a consistent methodology

that allows for PCI option identification and configuration during the

initial phases of booting the target operating system.

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Magma 7 Slot Series Spezifikationen Seite 34