F81218 Datasheet, PDF (34/64 Pages) Feature Integration Technology Inc. – ISA/LPC to 6 UART Datasheet

F81218
6.3.3 I/O Port Select Register – index 61h
Power-on default [7:0] = 0xF8h when SOUT2/PS_2F8_IRQB is pull-up,
0xE0h when DTR2#/PS_2E0_IRQB is pull-up, else 0x00h.
Bit
Name
R/W
Description
7:0 URB_BASE[7:0] R/W UART 2 I/O Port Address low byte.
6.3.4 IRQ Channel Select Register – index 70h
Power-on default [7:0] = 0x03h when SOUT2/PS_2F8_IRQB or DTR2#/PS_2E0_IRQB is pull-up,
else 0x00h
Bit
Name
R/W
Description
7:6 Reserved
R/W Return 0 when read.
5
URBIRQ_MODE R/W 0 : PCI IRQ sharing mode.
1 : ISA IRQ sharing mode.
This bit is effective in IRQ sharing mode.
4
URBIRQ_SHAR R/W 0 : IRQ is not sharing with other device.
1 : IRQ is sharing with other device.
3:0 SELURAIRQ[3:0] R/W In LPC mode , select the Serial IRQ channel.
In ISA mode , select one of six IRQ pins .
03h : use serial IRQ channel 3 in LPC mode or use ISA_IRQA in ISA
mode.
04h : use serial IRQ channel 4 in LPC mode or use ISA_IRQB in ISA
mode.
05h : use serial IRQ channel 5 in LPC mode or use ISA_IRQC in ISA
mode.
09h : use serial IRQ channel 9 in LPC mode or use ISA_IRQD in ISA
mode.
0Ah : use serial IRQ channel 10 in LPC mode or use ISA_IRQE in
ISA mode.
0Bh : use serial IRQ channel 11 in LPC mode or use ISA_IRQF in
ISA mode.
Otherwise will disable interrupt.
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August, 2007
V0.33P