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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 />

edge of CLK after RST_ has been released. All of the sampled pins are<br />

cascaded with several layers of registers to eliminate problems with hold<br />

time.<br />

Table 2-15 summarizes the hardware configuration options that relate to<br />

the PHB.<br />

Table 2-15. PHB Hardware Configuration<br />

Function Sample Pin(s) Sampled<br />

State<br />

Meaning<br />

PCI 64-bit Enable REQ64_ 0 64-bit PCI Bus<br />

1 32-bit PCI Bus<br />

PPC Register Base RD[5] 0 Register Base = $FEFF0000<br />

1 Register Base = $FEFE0000<br />

MPIC Interrupt Type RD[7] 0 Parallel Interrupts<br />

1 Serial Interrupts<br />

PPC Arbiter Mode RD[8] 0 Disabled<br />

1 Enabled<br />

PCI Arbiter Mode RD[9] 0 Disabled<br />

1 Enabled<br />

PPC:PCI Clock Ratio RD[10:12] 000 Reserved<br />

100 1:1<br />

010 2:1<br />

110 3:1<br />

001 3:2<br />

101 Reserved<br />

011 5:2<br />

111 Reserved<br />

2-50 <strong>Computer</strong> Group Literature Center Web Site

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