HP Compaq dc71 Series, Technical Reference Manual

Page: 85 / 212

Technical Reference Guide 361834-002 4-27
System Support
4.6.2 LPC47B397 I/O Controller Functions
The LPC47B397 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 LPC47B397. 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 LPC47B397. Table 4-16 lists the PnP standard control registers for the
LPC47B397.
NOTE:
For a detailed description of registers refer to appropriate SMC documentation.
Table 4-16.
LPC47B397 I/O Controller Control Registers
Index Function Reset Value
02h Configuration Control 00h
03h Reserved
07h Logical Device (Interface) Select:
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 00h
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