W83877 datasheet(78/125 Pages) WINBOND

Part #	W83877

Description	WINBOND I/O

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Manufacturer	WINBOND [Winbond]

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W83877F

- 78 -

1

Puts the FDC in power-down mode.

IDEPWD (Bit 2):

This bit controls the power of the IDE.

0

Power is supplied to the IDE. (default)

1

Puts the IDE in power-down mode.

FDCTRI (Bit 1):

This bit enables or disables the tri-state outputs of the FDC in power-down mode.

0

The output pins of the FDC will not be tri-stated when FDC is in power-down mode.

1

The output pins of the FDC will be tri-stated when FDC is in power-down mode.

IDETRI (BIt 0):

This bit enables or disables the tri-state outputs of the IDE in power-down mode.

0

The output pins of the IDE will not be tri-stated when IDE is in power-down mode.

1

The output pins of the IDE will be tri-stated when IDE is in power-down mode.

8.2.8 Configuration Register 7 (CR7), default = 00H

When the device is in Extended Function mode and EFIR is 07H, the CR7 register can be accessed

through EFDR. The bit definitions are as follows:

7

6

5

4

3

2

1

0

FDD A type 0

FDD A type 1

FDD B type 0

FDD B type 1

FDD C type 0

FDD C type 1

FDD D type 0

FDD D type 1

FDD A type 1, 0 (Bit 1, 0):

These two bits select the type of FDD A.

00

Selects normal mode. When RWC = 0, the data transfer rate is 250 Kb/s. When

RWC

= 1, the data transfer rate is 500 Kb/s.

Three mode FDD select (EN3MODE = 1):

01

RWC

= 0, selects 1.2 MB high-density FDD.

10

RWC = 1, selects 1.44 MB high-density FDD.

11

Don't care RWC

, selects 720 KB double-density FDD.

FDD B type 1, 0 (Bit 3, 2):

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