PC8477B datasheet(18/54 Pages) NSC

18 / 54 page

40 Command Set Description (Continued)

SET TRACK

Command Phase

0WNR100

MSB

DR1

DR0

New Track Number (PTR)

Execution Phase

Internal register is read or written

Result Phase

Value

SPECIFY

Command Phase

0000001

Step Rate Time

Motor Off Time

Motor On Time

DMA

Execution Phase

Internal registers are written

No Result Phase

VERIFY

Command Phase

MFM

DR1

DR0

Track Number

Drive Head Number

Sector Number

Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Data LengthSector Count

Execution Phase

Data is read from disk but not transferred

to the system

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

XXXHDDR1

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

XXXHDDR1

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

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