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MVME5100 Single Board Computer Programmer's Reference Guide

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2<br />

Hawk PCI Host Bridge & Multi-Processor Interrupt Controller<br />

PPC Address Mapping<br />

The PHB will map either PCI memory space or PCI I/O space into PPC<br />

address space using four programmable map decoders. These decoders<br />

provide windows of access to the PCI bus from the PPC bus. The most<br />

significant 16 bits of the PPC address are compared with the address range<br />

of each map decoder, and if the address falls within the specified range, the<br />

access is passed on to the PCI. An example of this is shown in Figure 2-2.<br />

PPC Bus Address 8 0 8 0 1 2 3 4<br />

0<br />

1516<br />

31<br />

Decode is<br />

>= and

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