PC87306 datasheet(52/110 Pages) NSC

tên linh kiện	PC87306

Giải thích chi tiết về linh kiện	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%

nhà sản xuất	NSC [National Semiconductor (TI)]

Trang chủ	http://www.national.com

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40 FDC Command Set Description (Continued)

Execution Phase

Disk drive head stepped in or out a pro-

grammable number of tracks

Result Phase

None

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 control-

ler is compared to data read from disk

Result Phase

MFM

IPS

DR1

DR0

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 control-

ler 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 control-

ler 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

00001111

XXXXX

DR1

DR0

New Track Number

MSN of Track Number

0000

Note

The 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

programmed track

Result Phase

None

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