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Chapter 4 System Support
Compaq Evo and Workstation Personal Computers
Featuring the Intel Pentium 4 Processor
Second Edition – January 2003
4-32
4.8.2
he LPC47B367 I/O controller contains various functions such as the keyboard/mouse interfaces,
disk
uses iguration of these
nctions uses indexed ports unique to the LPC47B367. In these systems, hardware strapping
selec at reset as ta ports for accessing the logical
devic LPC47B367. Table 4-18 rd control registers for the
LPC4
Tabl 47B367 I/O Controller Register
Table 4-18.
ller Con
LPC47B367 I/O CONTROLLER FUNCTIONS
T
ette interface, serial interfaces, and parallel interface. While the control of these interfaces
standard AT-type I/O addressing (as described in chapter 5) the conf
fu
ts I/O addresses 02Eh and 02Fh the Index/Da
es within the lists the PnP standa
7B367.
e 4-18 LPC s
LPC47B367 I/O Contro trol Re ters
gis
Index Function Reset Value
02h Configuration Control 00h
03h Reserved
07h
erved
llel I/F
04h = Serial I/F (UART 1/Port A)
08h = Reserved
Logical Device (Interface) Select:
00h = Diskette Drive I/F
01h = Reserved
02h = Res
03h = Para
00h
05h = Serial I/F (UART 2/Port B)
06h = Reserved
07h = Keyboard I/F
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:
The r the
configuration phase has been activated by writing 55h to I/O port 2Eh. The desired interface
ogical device) is initiated by firmware selecting logical device number of the 47B347 using the
following sequence:
1. Write 07h to I/O register 2Eh.
2. Write value of logical device to I/O register 2Fh.
. 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.
For a detailed description of registers refer to appropriate SMC documentation.
configuration registers are accessed through I/O registers 2Eh (index) and 2Fh (data) afte
(l
3