AMD SC2200 manual Relevant IRCP/SP3 Registers, IRCP/SP3 Configuration Register

SuperI/O Module 32580B

5.4.2.3LDN 02h - Infrared Communication Port or Serial Port 3

Table 5-9lists the configuration registers which affect the Infrared Communication Port or Serial Port 3 (IRCP/SP3).

Only the last register (F0h) is described here (Table 5-10). See Table 5-3 "Standard Configuration Registers" on page 101 for descriptions of the other registers listed.

Table 5-9. Relevant IRCP/SP3 Registers

			Reset
Index	Type	Configuration Register or Action	Value
30h	R/W	Activate. See also bit 0 of the SIOCF1 register.	00h
60h	R/W	Base Address MSB register. Bits [7:3] (for A[15:11]) are RO, 00000b.	03h
61h	R/W	Base Address LSB register. Bit [2:0] (for A[2:0]) are RO, 000b.	E8h
70h	R/W	Interrupt Number.	00h
71h	R/W	Interrupt Type. Bit 1 is R/W; other bits are RO.	03h
74h	R/W	DMA Channel Select 0 (RX_DMA).	04h
75h	R/W	DMA Channel Select 1 (TX_DMA).	04h
F0h	R/W	Infrared Communication Port/Serial Port 3 Configuration register.	02h

Table 5-10. IRCP/SP3 Configuration Register

Bit	Description
Index F0h	Infrared Communication Port/Serial Port 3 Configuration Register (R/W)	Reset Value: 02h

7Bank Select Enable. Enables bank switching.

0:All attempts to access the extended registers are ignored. (Default)

1:Enables bank switching.

6:3 Reserved.

2Busy Indicator. (RO) This bit can be used by power management software to decide when to power-down the device.

0:No transfer in progress. (Default)

1:Transfer in progress.

1Power Mode Control. When the logical device is active in:

0:Low power mode - Clock disabled. The output signals are set to their default states. Registers are maintained. (Unlike Active bit in Index 30h that also prevents access to device registers.)

1:Normal power mode - Clock enabled. The device is functional when the logical device is active. (Default)

0TRI-STATE Control. When enabled and the device is inactive, the logical device output pins are in TRI-STATE. One excep- tion is the IRTX/SOUT3 pin, which is driven to 0 when the Infrared Communication Port or Serial Port 3 is inactive and is not affected by this bit.

0:Disabled. (Default)

1:Enabled (when the device is inactive).

AMD Geode™ SC2200 Processor Data Book 107