PC8477B datasheet(15/54 Pages) NSC

15 / 54 page

40 Command Set Description

The following is a table of the PC8477B command set Each

command contains a unique first command byte called the

opcode byte which will identify to the controller how many

command bytes to expect If an invalid command byte is

issued to the controller it will immediately go into the Result

Phase and the status will be 80 (hex) which signifies Invalid

Command

41 COMMAND SET SUMMARY

CONFIGURE

Command Phase

0011

0000

EIS

FIFO

POLL

THRESH

PRETRK

Execution Phase

Internal registers written

No Result Phase

DUMPREG

Command Phase

00001110

Execution Phase

Internal registers read

Result Phase

PTR Drive 0

PTR Drive 1

PTR Drive 2

PTR Drive 3

Step Rate Time

Motor Off Time

Motor On Time

DMA

Sectors per TrackEnd of Track

LOCK

DC3

DC2

DC1

DC0

GAP

EIS

FIFO

POLL

THRESH

PRETRK

Note

Sectors per Track parameter returned if last command issued was

Format End of Track parameter returned if last command issued was Read

or Write

FORMAT TRACK

Command Phase

MFM

XXXHDDR1

DR0

Bytes per Sector

Sectors per Track

Format Gap

Data Pattern

Execution Phase

System transfers four ID bytes (track

head sector bytessector) per sector to the floppy control-

ler via DMA or Non-DMA modes The entire track is format-

ted The data block in the Data Field of each sector is filled

with the data pattern byte

Result Phase

Status Register 0

Status Register 1

Status Register 2

Undefined

INVALID

Command Phase

Invalid Op Codes

Result Phase

Status Register 0 (80 hex)

LOCK

Command Phase

LOCK

Execution Phase

Internal register is written

Result Phase

LOCK

MODE

Command Phase

TMR

IAF

IPS

LOW PWR

ETR

FWR

FRD

BST

R255

DENSEL

BFR

WLD

Head Settle

Execution Phase

Internal registers are written

No Result Phase

NSC

Command Phase

00011000

Result Phase

01110011

PERPENDICULAR MODE

Command Phase

0100

DC3

DC2

DC1

DC0

GAP

Execution Phase

Internal registers are written

No Result Phase

PC8477B bảng dữ liệu(PDF) 15 Page - National Semiconductor (TI)

PC8477B bảng dữ liệu(HTML) 15 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

bảng dữ liệu tải về

Link URL