Technical Reference Guide www.hp.com 4-25
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.
NOTE:
For a detailed description of registers refer to appropriate documentation available from SMC
Corporation.
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 = 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
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