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BIOS SPECIFICATION
6-19
001 -> IRQ10
010 -> IRQ11
011 -> Reserved
100 -> IRQ20(Only available if APIC enabled)
101 -> IRQ21(Only available if APIC enabled)
110 -> IRQ22(Only available if APIC enabled)
111 -> IRQ23(Only available if APIC enabled)
6.2.2.2.2 PIRQ[A,C,D,E,F,G,H] Routing Control
PIRQA Routing Control Register 0x60
PIRQB Routing Control Register 0x61
PIRQC Routing Control Register 0x62
PIRQD Routing Control Register 0x63
PIRQE Routing Control Register 0x68
PIRQF Routing Control Register 0x69
PIRQG Routing Control Register 0x6A
PIRQH Routing Control Register 0x6B
The description of bit fields are described below.
Bit7 : IRQEN Interrupt Routing Enable
0 -> The corresponding PIRQ is routed to one of the ISA-compatible
interrupts specified in bits[3:0]
1 -> The PIRQ is not routed to the 8259.
Bit6~4 : Reserved
Bit3~0 : 0000 = Reserved, 1000 = Reserved
0001 = Reserved, 1001 = IRQ9
0010 = Reserved, 1010 = IRQ10
0011 = IRQ3, 1011 = IRQ11
0100 = IRQ4, 1100 = IRQ12
0101 = IRQ5, 1101 = Reserved
0110 = IRQ6, 1110 = IRQ14
0111 = IRQ7, 1111 = IRQ15
Currently BIOS setting is described below (Legacy Mode),
Table 6-1 IRQ Configuration Table
PIN IRQ PIN IRQ
A 11 E Disabled
B 5 F Disabled
C 6 G Disabled
D 4 H 3
6.2.2.3 DMA Configuration
The ICH7-M supports two types of DMA: LPC and PC/PCI. DMA via LPC is similar to ISA
DMA. LPC DMA and PC/PCI DMA use the ICH7-M’s DMA Controller.
S62F uses LPC DMA I/F for Parallel Port because LPC LN47N217 Super I/O is used to
support those functions.
Table 6-3 DMA Resource Allocation
Channel Allocation Channel Allocation
0 Reserved 4 Cascade
1 Reserved 5 Reserved
2 Reserved 6 Reserved
3 ECP 7 Reserved