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Special Registers
EBX-22 Reference Manual
75
IRQ and Resource ISA Routing Register
IRQISA (Read/Write) 1DEh
D7 D6 D5 D4 D3 D2 D1 D0
COM2 COM1 COM4 COM3 IRQ10 IRQ5 IRQ4 IRQ3
This register is used to allow IRQs to be routed across the ISA bridge.
Table 43: IRQISA Register Bit Assignments
Bit Mnemonic
Description
D7 COM2
COM2 I/O
0 = I/O range for COM2 is used for on-board UART
1 = I/O range for COM2 is forwarded to ISA bus for use by expansion cards
D6 COM1
COM1 I/O
0 = I/O range for COM1 is used for on-board UART
1 = I/O range for COM1 is forwarded to ISA bus for use by expansion cards
D5 COM4
COM4 I/O
0 = I/O range for COM4 is used for on-board UART
1 = I/O range for COM4 is forwarded to ISA bus for use by expansion cards
D4 COM3
COM3 I/O
0 = I/O range for COM3 is used for on-board UART
1 = I/O range for COM3 is forwarded to ISA bus for use by expansion cards
D3 IRQ10
IRQ10
0 = IRQ10 on PC/104 (ISA) bus is ignored
1 = ISA bridge forwards IRQ10 to host
D2 IRQ5
IRQ5
0 = IRQ5 on PC/104 (ISA) bus is ignored
1 = ISA bridge forwards IRQ5 to host
D1 IRQ4
IRQ4
0 = IRQ4 on PC/104 (ISA) bus is ignored
1 = ISA bridge forwards IRQ4 to host
D0 IRQ3
IRQ3
0 = IRQ3 on PC/104 (ISA) bus is ignored
1 = ISA bridge forwards IRQ3 to host
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