2-50 Computer Group Literature Center Web Site
Hawk PCI Host Bridge & Multi-Processor Interrupt Controller
2
edge of CLK after RST_ has been released. All of the sampled pins are
cascaded with several layers of registers to eliminate problems with hold
time.
Table 2-15 summarizes the hardware configuration options that relate to
the PHB.
Table 2-15. PHB Hardware Configuration
Function Sample Pin(s) Sampled
State Meaning
PCI 64-bit Enable REQ64_ 0 64-bit PCI Bu s
1 32-bit PCI Bus
PPC Register Base RD[5] 0 Register Base = $FEFF0000
1 Register Base = $FEFE0000
MPIC Interrupt Type RD[7] 0 Parallel Interrupts
1 Serial Interrupts
PPC Arbiter Mode RD[8] 0 Disabled
1Enabled
PCI Arbiter Mode RD[9] 0 Disabled
1Enabled
PPC:PCI Clock Ratio RD[10:12] 000 Reserved
100 1:1
010 2:1
110 3:1
001 3:2
101 Reserved
011 5:2
111 Reserved