PC87311AVF datasheet(25/78 Pages) NSC

25 / 78 page

40 FDC Command Set Description (Continued)

Result Phase

Status Register 0

Status Register 1

Status Register 2

Undefined

INVALID

Command Phase

Invalid Op Codes

Result Phase

Status Register 0 (80 hex)

LOCK

Command Phase

LOCK0010100

Execution Phase

Internal register is written

Result Phase

000LOCK0000

MODE

Command Phase

TMR

IAF

IPS

LOW PWR

ETR

FWR

FRD

BST

R255

DENSEL

BFR

WLD

Head Settle

Execution Phase

Internal registers are written

No Result Phase

NSC

Command Phase

00011000

Result Phase

01110011

PERPENDICULAR MODE

Command Phase

0100

DC3

DC2

DC1

DC0

GAP

Execution Phase

Internal registers are written

No Result Phase

READ 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 read from disk drive is transferred

to system via DMA or Non-DMA modes

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

Bytes per Sector

READ 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 read from disk drive is transferred

to system via DMA or Non-DMA modes

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

Bytes per Sector

PC87311AVF Datasheet(PDF) 25 Page - National Semiconductor (TI)

PC87311AVF Datasheet(HTML) 25 Page - National Semiconductor (TI)

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