
82C814
Page 30
January 08, 1998
912-3000-047
Revision: 1.0
OPTi
PCICFG 4Bh
Docking PCIRQ3# Interrupt Assignment Register
Default = 04h
Reserved
Using OPTi IRQ driveback mechanism:
Docking PCIRQ3# Interrupt Assignment (PCIRQ3# Default) - Interrupts from the dock-
ing PCIRQ3# 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#
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# (Default)
00101-01111 = Rsrvd
11011 = IRQ11
11100 = IRQ12
11101 = IRQ13
11110 = IRQ14
11111 = IRQ15
Reserved
011 = INTC#
100 = INTD# (default)
101-111 = Reserved
PCICFG 4Ch
Docking Detect Interrupt Assignment Register
Default = 01h
Host controller 
type:
0 = FireStar
(burst two data 
phases)
1 = Viper-N+ 
(send single 
data phase on 
IRQ driveback)
Interrupt Pin 
Requested in 
PCICFG 3Dh
0 = equal to 
Level Mode 
selections in 
PCICFG 
4Ch[4:0]
1 = Always 01
Reserved
Using OPTi IRQ driveback mechanism:
Docking Detect Interrupt Assignment - If attachment of a docking station is detected, or 
if the device attached could not be determined, this interrupt will be generated. This 
same interrupt will be generated when the docking station is removed.
Level Mode:
00000 = Disabled
00100 = PCIRQ3# 
00001 = PCIRQ0# (Default)
00101 = ACPI0
00010 = PCIRQ1#
00110 = ACPI1
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# (default)
010 = INTB#
00111 = ACPI2
01000 = ACPI3
01001-01111 = Rsrvd
11011 = IRQ11
11100 = IRQ12
11101 = IRQ13
11110 = IRQ14
11111 = IRQ15
Reserved
011 = INTC#
100 = INTD#
101-111 = Reserved
PCICFG 4Dh
Serial IRQ Enable Register
Default = 00h
Test Bits (for factory use only)
Reserved
IRQSER on pin 
15
0 = Disabled
1 = Enabled
PCICFG 4Eh
Serial IRQ Control Register 1
Default = 00h
Table 5-1
Base Register Group - PCICFG 00h-4Fh (cont.)
7
6
5
4
3
2
1
0