Lenovo ThinkPad 770X Technical Reference Manual for the ThinkPad 770 - Page 67

Infrared (IR) Subsystem, IRQ Level and DMA Channel, MIF/FIR mode

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Infrared (IR) Subsystem The IR subsystem supports the following functions: MIF/FIR mode - 567 Kbps - 1.152 Mbps - 4.0 Mbps Sharp** mode - 9,600 bps The I/O address can be selected from the following with the system utility program. The IR subsystem uses one serial port address and one IR controller register address: I/O Address 03F8-03FF 02F8-02FF 03E8-03EF 02E8-02EF 03F8-03FF 02F8-02FF 03E8-03EF 02E8-02EF Serial port 1 (default) Serial port 2 Serial port 3 Serial port 4 IR controller register 1 (default) IR controller register 2 IR controller register 3 IR controller register 4 IRQ Level and DMA Channel The IR subsystem uses one IRQ level and two DMA channels for ThinkPad mode. (Generic mode and Sharp mode do not require DMA channels.) IRQ Level IRQ 3 IRQ 4 (default) IRQ 5 IRQ 10 IRQ 11 IRQ 15 DMA Channel DMA 0 DMA 3 Subsystems 3-9

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Infrared (IR) Subsystem
The IR subsystem supports the following functions:
±
MIF/FIR mode
– 567 Kbps
– 1.152 Mbps
– 4.0 Mbps
±
Sharp** mode
– 9,600 bps
The I/O address can be selected from the following with the system
utility program.
The IR subsystem uses one serial port address and
one IR controller register address:
IRQ Level and DMA Channel
The IR subsystem uses one IRQ level and two DMA channels for
ThinkPad mode.
(Generic mode and Sharp mode do not require
DMA channels.)
I/O Address
03F8–03FF
Serial port 1 (default)
02F8–02FF
Serial port 2
03E8–03EF
Serial port 3
02E8–02EF
Serial port 4
03F8–03FF
IR controller register 1 (default)
02F8–02FF
IR controller register 2
03E8–03EF
IR controller register 3
02E8–02EF
IR controller register 4
IRQ Level
DMA Channel
IRQ 3
IRQ 4 (default)
IRQ 5
IRQ 10
IRQ 11
IRQ 15
DMA 0
DMA 3
Subsystems
3-9