W83781D datasheet(19/54 Pages) WINBOND

Part #	W83781D

Description	H/W MONITORING IC

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Manufacturer	WINBOND [Winbond]

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W83781D/W83781G

Publication Release Date: April 14, 2005

- 15 -

Revision 2.0

8. CONTROL AND STATUS REGISTERS

8.1 Address Register (Port x5h)

The main register is the INDEX Register located at Port x5h. The bit designations are as follows:

7

6

5

4

3

2

1

0

INDEX Pointe

Busy

Bit7: Read Only

The logical 1 indicates the device is busy because of a Serial Bus transaction or another ISA bus

transaction. With checking this bit, multiple ISA drivers can use W83781D/G without interfering with

each other or a Serial Bus driver.

It is the user's responsibility not to have a Serial Bus and ISA bus operations at the same time.

This bit is:

Set:

with a write to Port x5h or when a Serial Bus transaction is in progress.

Reset:

with a write or read from Port x6h if it is set by a write to Port x5h, or when the Serial Bus

transaction is finished.

Bit 6-0: Read/Write

INDEX of Control and Status Registers. See the tables below for detail.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Busy

Index Pointer (Power On default 00h)

(Power On default 0)

A6

A5

A4

A3

A2

A1

A0

Index Pointer (A6-A0)

Registers

Bank

A6-A0

in Hex

Power On Value

of Registers:

<7:0>in Binary

Notes

Configuration Register

0

40h

00001000

Interrupt Status Register 1

0

41h

00000000

Auto-increment to the

address of Interrupt Status

Register 2 after a read or

write to Port x6h.

Interrupt Status Register 2

0

42h

00000000

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