W83977EF-AW datasheet(23/142 Pages) WINBOND

Part #	W83977EF-AW

Description	WINBOND ISA I/O

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Manufacturer	WINBOND [Winbond]

Direct Link	http://www.winbond.com

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W83977EF-AW/W83977EG-AW

Publication Release Date: Apr. 2006

-21-

Revision 1.2

5.1.6

FDC Core

The W83977EF/EG FDC is capable of performing twenty commands. Each command is initiated by a

multi-byte transfer from the microprocessor. The result can also be a multi-byte transfer back to the

microprocessor. Each command consists of three phases: command, execution, and result.

Command

The microprocessor issues all required information to the controller to perform a specific operation.

Execution

The controller performs the specified operation.

Result

After the operation is completed, status information and other housekeeping information is provided to

the microprocessor.

5.1.7

FDC Commands

Command Symbol Descriptions:

C:

Cylinder number 0 - 256

D:

Data Pattern

DIR:

Step Direction

DIR = 0, step out

DIR = 1, step in

DS0:

Disk Drive Select 0

DS1:

Disk Drive Select 1

DTL:

Data Length

EC:

Enable Count

EOT:

End of Track

EFIFO:

Enable FIFO

EIS:

Enable Implied Seek

EOT:

End of track

FIFOTHR:

FIFO Threshold

GAP:

Gap length selection

GPL:

Gap Length

H:

Head number

HDS:

Head number select

HLT:

Head Load Time

HUT:

Head Unload Time

LOCK:

Lock EFIFO, FIFOTHR, PTRTRK bits prevent affected by software reset

MFM:

MFM or FM Mode

MT:

Multitrack

N:

The number of data bytes written in a sector

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W83977EF-AW Datasheet(PDF) 23 Page - Winbond

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