HP Dc7700 HP Compaq dx7300 and dc7700 Business PC Technical Reference Guide, 1 - Page 77
SCH5317 I/O Controller Functions, SCH5317 I/O Controller Control Registers
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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. Index 02h 03h 07h 20h 21h 22h 23h 24h 25h 26h 27h 28-2Fh Table 4-15. SCH5317 I/O Controller Control Registers Function Reset Value Configuration Control 00h Reserved 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 Super I/O ID Register (SID) 56h Revision -- Logical Device Power Control 00h Logical Device Power Management 00h PLL / Oscillator Control 04h Reserved Configuration Address (Low Byte) Configuration Address (High Byte) Reserved NOTE: For a detailed description of registers refer to appropriate documentation available from SMC Corporation. Technical Reference Guide www.hp.com 4-25