HP dx7300 4.6.2 SCH5317 I/O Controller Functions, SCH5317 I/O Controller Control Registers

System Support

4.6.2 SCH5317 I/O Controller Functions

The SCH5317 I/O controller contains various functions such as the keyboard/mouse interfaces, diskette interface, serial interfaces, and parallel interface. While the control of these interfaces uses standard AT-type I/O addressing (as described in chapter 5) the configuration of these functions uses indexed ports unique to the SCH5317. In these systems, hardware strapping selects I/O addresses 02Eh and 02Fh at reset as the Index/Data ports for accessing the logical devices within the SCH5317. Table 4-15 lists the PnP standard control registers for the SCH5317.

Table 4-15.

SCH5317 I/O Controller Control Registers

Index	Function		Reset Value
02h	Configuration Control		00h
03h	Reserved
07h	Logical Device (Interface) Select:		00h
	00h	= Diskette Drive I/F
	01h = Reserved
	02h = Reserved
	03h = Parallel I/F
	04h	= Serial I/F (UART 1/Port A)
	05h	= Serial I/F (UART 2/Port B)
	06h	= Reserved
	07h = Keyboard I/F
	08h	= Reserved
	09h	= Reserved
	0Ah = Runtime Registers (GPIO Config.)
	0Bh = SMBus Configuration
20h	Super I/O ID Register (SID)		56h
21h	Revision		--
22h	Logical Device Power Control		00h
23h	Logical Device Power Management		00h
24h	PLL / Oscillator Control		04h
25h	Reserved
26h	Configuration Address (Low Byte)
27h	Configuration Address (High Byte)
28-2Fh	Reserved

NOTE:

For a detailed description of registers refer to appropriate documentation available from SMC Corporation.

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