PC87306 datasheet(53/110 Pages) NSC

부품명	PC87306

상세설명	PC87306 SuperI/OTM Enhanced Sidewinder Lite Floppy Disk Controller, Keyboard Controller, Real-Time Clock, Dual UARTs, Infrared Interface, IEEE 1284 Pa

PDF	110 Pages

Scroll/Zoom	100%

제조업체	NSC [National Semiconductor (TI)]

홈페이지	http://www.national.com

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53 / 110 page

40 FDC Command Set Description (Continued)

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

The third Result Phase byte can only be read if ETR is set in the

Mode Command

SET TRACK

Command Phase

WNR

MSB

DS1

DS0

Present Track Number (PTR)

Execution Phase

Internal register selected by MSB of DS1

or DS0 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

Result Phase

None

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

Execution Phase

None

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

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