PC87310 datasheet(29/52 Pages) NSC

29 / 52 page

40 Functional Description (Continued)

READ DELETED DATA

Based on the specified address and

the deleted data mark

Command Phase

MT MFM SK

IPS

HD DR1 DR0

Track Number

Drive Head Number

Sector Number

Number of Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Data Length

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

BytesSector

WRITE DATA

To specified sectors in logical order on

a track (optional Implied Seek)

Command Phase

MT MFM

000101

IPS

HD DR1 DR0

Track Number

Drive Head Number

Sector Number

Number of Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Data Length

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

BytesSector

SCAN EQUAL

Compare on a byte-by-byte basis the

P and disk data from the specified

sector match on e

Command Phase

MT MFM SK

IPS

HD DR1 DR0

Track Number

Drive Head Number

Sector Number

Number of Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Sector Step Size

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

BytesSector

READ A TRACK

Read all sectors on the specified track

in physical order

Command Phase

MFM SK

IPS

HD DR1 DR0

Track Number

Drive Head Number

Sector Number

Number of Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Data Length

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

BytesSector

WRITE DELETED DATA

Based on the address and the Deleted

Data Mark

Command Phase

MT MFM

001001

IPS

HD DR1 DR0

Track Number

Drive Head Number

Sector Number

Number of Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Data Length

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

BytesSector

SCAN LOW OR EQUAL

Compare on a byte-by-byte basis the

P and disk data from the specified

sector match on ke

Command Phase

MT MFM SK

IPS

HD DR1 DR0

Track Number

Drive Head Number

Sector Number

Number of Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Sector Step Size

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

BytesSector

PC87310 Datasheet(PDF) 29 Page - National Semiconductor (TI)

PC87310 Datasheet(HTML) 29 Page - National Semiconductor (TI)

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