PC8477B datasheet(17/54 Pages) NSC

17 / 54 page

40 Command Set Description (Continued)

SCAN EQUAL

Command Phase

MFM

IPS

DR1

DR0

Track Number

Drive Head Number

Sector Number

Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Sector Step Size

Execution

Phase

Data transferred from system to

controller is compared to data read from disk

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

Bytes per Sector

SCAN HIGH OR EQUAL

Command Phase

MFM

IPS

DR1

DR0

Track Number

Drive Head Number

Sector Number

Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Sector Step Size

Execution

Phase

Data transferred from system to

controller is compared to data read from disk

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

Bytes per Sector

SCAN LOW OR EQUAL

Command Phase

MFM

IPS

DR1

DR0

Track Number

Drive Head Number

Sector Number

Bytes per Sector

End of Track Sector Number

Intersector Gap Length

Sector Step Size

Execution

Phase

Data transferred from system to

controller is compared to data read from disk

Result Phase

Status Register 0

Status Register 1

Status Register 2

Track Number

Head Number

Sector Number

Bytes per Sector

SEEK

Command Phase

DR1

DR0

New Track Number

MSN of Track Number

Note

Last Command Phase byte is required only if ETR is set in Mode

Command

Execution Phase

Disk drive head is stepped in or out to a

programmable track

No Result Phase

SENSE DRIVE STATUS

Command Phase

00000

XXXXXHDDR1

DR0

Execution Phase

Disk drive status information is detected

and reported

Result Phase

Status Register 3

SENSE INTERRUPT

Command Phase

00001000

Execution Phase

Status of interrupt is reported

Result Phase

Status Register 0

Present Track Number (PTR)

MSN of PTR

0000

Note

Third Result Phase byte can only be read if ETR is set in the Mode

Command

PC8477B 数据表(PDF) 17 Page - National Semiconductor (TI)

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PC8477B 数据表(PDF) 17 Page - National Semiconductor (TI)

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