87307 I/O Controller Configuration; 87307 I/O Controller - Compaq Deskpro 4000N Technical Reference Manual

Chapter 4 System Support
4.6.2

87307 I/O CONTROLLER CONFIGURATION

The 87307 I/O controller contains various functions such as the keyboard/mouse interfaces,
diskette interface, serial interfaces, and parallel interface. Software control of these interfaces
uses standard AT-type I/O addressing. Firmware configuration of these functions uses indexed
ports unique to the 87307. In this system, hardware strapping selects I/O addresses 015Ch and
015Dh at reset as the Index/Data ports for accessing the configuration registers of the logical
devices within the 87307. The hardware strapping also places the 87307 into PnP motherboard
mode. Table 4-18 lists the PnP standard configuration registers for the devices within the 87307.
Table 4–18. 87307 I/O Controller PnP Standard Control Registers
87307 I/O Controller PnP Standard Configuration Registers
Index Function
00h Set RD_DATA Port
01h Serial Isolation
02h Configuration Control
03h Wake (CSN)
04h Resource Data
05h Status
06h Card Select Number (CSN)
07h Logical Device Select:
00h = 8042 Controller (Keyboard I/F)
01h = 8042 Controller (Mouse I/F)
02h = RTC/APC Configuration
03h = Diskette Controller
04h = Parallel Port
05h = UART 2 (Serial Port B / IrDA)
06h = UART 1 (Serial Port A)
07h = GPIO Ports
08h = Power Management
20h Super I/O ID Register (SID)
21h SIO Configuration 1 Register
22h SIO Configuration 1 Register
23h Programmable Chip Select Configuration Index
24h Programmable Chip Select Configuration Data
30h Logical Device Activate
31h Logical Device I/O Range Check
60,61h Logical Device Data Base Address
62,63h Logical Device Command Base Address
70h Logical Device Interrupt Select
71h Logical Device Interrupt Type
74,75h Logical Device DMA Assignment
F0h Logical Device Configuration
F1h Drive ID (Logical Device 03 only)
The configuration registers are accessed by writing the appropriate logical device's number to
index 07h and writing the desired offset to the index register. The data is then either written to or
read from the data register.
4-42 Compaq Deskpro 4000N and 4000S Personal Computers
Table 4-18.
First Edition - September 1997
Reset Value
00h
00h
00h
00h
A0h
D6h
02h
00h
00h
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