HP D315 manual 2 LPC47B367 I/O Controller Functions, LPC47B367 I/O Controller Control Registers

Technical Reference Guide

4.8.2 LPC47B367 I/O CONTROLLER FUNCTIONS

The LPC47B367 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 LPC47B367. 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 LPC47B367. Table 4-15 lists the PnP standard control registers for the LPC47B367.

Table 4-15LPC47B367 I/O Controller Registers

Table 4-15.

LPC47B367 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 SMC documentation.

The configuration registers are accessed through I/O registers 2Eh (index) and 2Fh (data) after the configuration phase has been activated by writing 55h to I/O port 2Eh. The desired interface (logical device) is initiated by firmware selecting logical device number of theLPC47B347 using the following sequence:

1.Write 07h to I/O register 2Eh.

2.Write value of logical device to I/O register 2Fh.

3.Write 30h to I/O register 2Eh.

4.Write 01h to I/O register 2Fh (this activates the interface).

Writing AAh to 2Eh deactivates the configuration phase.

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