
82C814
912-3000-047
Revision: 1.0
Page 29
January 08, 1998
OPTi
PCICFG 49h
Docking PCIRQ1# Interrupt Assignment Register
Default = 02h
Reserved
Using OPTi IRQ driveback mechanism:
Docking PCIRQ1# Interrupt Assignment (PCIRQ1# Default) - Interrupts from the dock-
ing PCIRQ1# pin are mapped to this interrupt. Note that if an IRQ (an edge-mode inter-
rupt) is selected, this IRQ must be programmed to Level mode on the host chipset.
Level Mode:
00000 = Disabled
00010 = PCIRQ1# (Default)
00001 = PCIRQ0# 
00011 = PCIRQ2#
Edge Mode: (Viper-N+)
10000 = IRQ0
10110 = IRQ6
10001 = IRQ1
10111 = IRQ7
10010 = IRQ2
11000 = IRQ8
10011 = IRQ3
11001 = IRQ9
10100 = IRQ4
11010 = IRQ10
10101 = IRQ5
Using Host PCI INTA#-D# (PCICFG 50h[6]=1)
000 = Disabled
001 = INTA#
010 = INTB# (default)
00100 = PCIRQ3#
00101-01111 = Rsrvd
11011 = IRQ11
11100 = IRQ12
11101 = IRQ13
11110 = IRQ14
11111 = IRQ15
Reserved
011 = INTC#
100 = INTD#
101-111 = Reserved
PCICFG 4Ah
Docking PCIRQ2# Interrupt Assignment Register
Default = 03h
Reserved
Using OPTi IRQ driveback mechanism:
Docking PCIRQ2# Interrupt Assignment (PCIRQ2# Default) - Interrupts from the dock-
ing PCIRQ2# pin are mapped to this interrupt. Note that if an IRQ (an edge-mode inter-
rupt) is selected, this IRQ must be programmed to Level mode on the host chipset.
Level Mode:
00000 = Disabled
00010 = PCIRQ1# 
00001 = PCIRQ0# 
00011 = PCIRQ2# (Default)
Edge Mode: (Viper-N+)
10000 = IRQ0
10110 = IRQ6
10001 = IRQ1
10111 = IRQ7
10010 = IRQ2
11000 = IRQ8
10011 = IRQ3
11001 = IRQ9
10100 = IRQ4
11010 = IRQ10
10101 = IRQ5
Using Host PCI INTA#-D# (PCICFG 50h[6]=1)
000 = Disabled
001 = INTA#
010 = INTB#
00100 = PCIRQ3#
00101-01111 = Rsrvd
11011 = IRQ11
11100 = IRQ12
11101 = IRQ13
11110 = IRQ14
11111 = IRQ15
Reserved
011 = INTC# (default)
100 = INTD#
101-111 = Reserved
Table 5-1
Base Register Group - PCICFG 00h-4Fh (cont.)
7
6
5
4
3
2
1
0