User`s guide

Figure 3–11 Interrupt Control and PCI Arbitration
LJ-04140.AI
ISA
Slots
CPU
PCI
Slot 3
PCI-to-ISA
Bridge
Clock
Multiplier
Jumpers
Combination
Control
Keyboard/
Mouse
Control
System
Interrupt
PLDs
pci_req_s3_l
pci_gnt_s3_l
PCI
Slot 2
pci_req_s2_l
pci_gnt_s2_l
PCI
Slot 1
pci_req_s1_l
pci_gnt_s1_l
PCI
Slot 0
pci_req_s0_l
sio_int
pci_gnt_s0_l
21071-DA
sys_irq0
pci_isa_irq<0>
cpu_irq5,
<2:0>
irq_resetd_l
jmp_irq<2:0>
rtc_irq_l<1>
nmi <2>
drq<7:5,3:0>
<7:3> <12, 1>
irq<15:3, 1>
MUX
AlphaPC64.27AlphaPC64.2 AlphaPC64.26
AlphaPC64.4
AlphaPC64.29 AlphaPC64.31
AlphaPC64.4
AlphaPC64.34
pci_inta<3:0>
pci_intb<3:0>
pci_intc<3:0>
pci_intd<3:0>
PCI Bus
Functional Description 3–31