VT8231 datasheet(53/132 Pages) ETC

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VT8231

Preliminary Revision 0.8 October 29, 1999

-47-

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Super-I/O Configuration Index / Data Registers

Super-I/O configuration registers are accessed by performing

I/O operations to / from an index / data pair of registers in

system I/O space at port addresses 3F0h and 3F1h.

The

configuration registers accessed using this mechanism are used

to configure the Super-I/O registers (parallel port, serial ports,

IR port, and floppy controller).

Super I/O configuration is accomplished in three steps:

1) Enter configuration mode (set Function 0 Rx85[1] = 1)

2) Configure the chip

a) Write index to port 3F0

b) Read / write data from / to port 3F1

c) Repeat a and b for all desired registers

3) Exit configuration mode (set Function 0 Rx85[1] = 0)

Port 3F0h – Super-I/O Configuration Index...................RW

7-0

Index value

Function 0 PCI configuration space register Rx85[1] must be

set to 1 to enable access to the Super-I/O configuration

registers.

Port 3F1h – Super-I/O Configuration Data ....................RW

7-0

Data value

This register shares a port with the Floppy Status Port (which

is read only). This port is accessible only when Rx85[1] is set

to 1 (the floppy status port is accessed if Rx85[1] = 0).

Super-I/O Configuration Registers

These registers are accessed via the port 3F0 / 3F1 index / data

Index E0 – Super-I/O Device ID ....................................... RO

7-0

Super-I/O ID ........................................ default = 3Ch

Index E1 – Super-I/O Device Revision............................. RO

7-0

Super-I/O Revision Code ......................... default = 0

Index E2 – Super-I/O Function Select ............................ RW

7-5

Reserved

........................................ always reads 0

Floppy Controller Enable

Disable................................................... default

1Enable

Serial Port 2 Enable

Disable................................................... default

1Enable

Serial Port 1 Enable

Disable................................................... default

1Enable

1-0

Parallel Port Mode / Enable

00 Unidirectional mode .............................. default

01 ECP

10 EPP

11 Parallel Port Disabled

Index E3 – Floppy Controller I/O Base Address ........... RW

7-2

I/O Address 9-4......................................... default = 0

1-0

Must be 0

.............................................. default = 0

Index E6 – Parallel Port I/O Base Address .................... RW

7-0

I/O Address 9-2......................................... default = 0

If EPP is not enabled, the parallel port can be set to 192

locations on 4-byte boundaries from 100h to 3FCh. If EPP is

enabled, the parallel port can be set to 96 locations on 8-byte

boundaries from 100h to 3F8h.

Index E7 – Serial Port 1 I/O Base Address..................... RW

7-1

I/O Address 9-3......................................... default = 0

Must be 0

.............................................. default = 0

Index E8 – Serial Port 2 I/O Base Address..................... RW

7-1

I/O Address 9-3......................................... default = 0

Must be 0

.............................................. default = 0

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