PC87311AVF datasheet(28/78 Pages) NSC

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40 FDC Command Set Description (Continued)

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

Bytes per Sector

VERSION

Command Phase

00010000

Result Phase

10010000

WRITE DATA

Command Phase

MFM

IPS

DR1

DR0

Track Number

Drive Head Number

Sector Number

Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Data Length

Execution Phase

Data is transferred from the system to

the controller via DMA or Non-DMA modes and written to

the disk

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

Bytes per Sector

WRITE DELETED DATA

Command Phase

MFM

IPS

DR1

DR0

Track Number

Drive Head Number

Sector Number

Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Data Length

Execution Phase

Data is transferred from the system to

the controller via DMA or Non-DMA modes and written to

the disk

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

Bytes per Sector

42 COMMAND DESCRIPTION

421 Configure Command

The Configure Command will control some operation modes

of the controller It should be issued during the initialization

of the FDC after power up The function of the bits in the

Configure registers are described below These bits are set

to their default values after a hardware reset The value of

each bit after a software reset is explained The default val-

ue of each bit is denoted by a ‘‘bullet’’ to the left of each

item

EIS

Enable Implied Seeks Default after a software reset

0 e Implied seeks disabled through Configure command

Implied seeks can still be enabled through the Mode

command when EIS e 0 (default)

1 e

Implied seeks enabled for a read write scan or veri-

fy operation A seek and sense interrupt operation

will be performed prior to the execution of the read

write scan or verify operation The IPS bit does not

need to be set

PC87311AVF 데이터시트(PDF) 28 Page - National Semiconductor (TI)

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