FDC37C78-HT 查看數據表（PDF） - Microchip Technology

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FDC37C78-HT

Floppy Disk Controller

Microchip Technology 

PHASE

Command

PERPENDICULAR MODE

DATA BUS

R/W D7 D6 D5 D4 D3 D2 D1

D0

REMARKS

W

0 00100

1

0 Command Codes

OW 0 D3 D2 D1 D0 GAP WGATE

PHASE

Command

Result

INVALID CODES

DATA BUS

R/W D7 D6 D5 D4 D3 D2 D1 D0

REMARKS

W

───── Invalid Codes ─────

Invalid Command Codes

(NoOp - fdc goes into Standby

State)

R

─────── ST0 ───────

ST0 = 80H

PHASE

Command

Result

LOCK

DATA BUS

R/W

D7

D6 D5

D4

D3 D2 D1 D0

REMARKS

W LOCK 0 0

1

0 1 0 0 Command Codes

R

0

0 0 LOCK 0 0 0 0

SC is returned if the last command that was issued was the Format command. EOT is returned if the last

command was a Read or Write.

NOTE: These bits are used internally only. They are not reflected in the Drive Select pins. It is the user's

responsibility to maintain correspondence between these bits and the Drive Select pins (DOR).

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