PC87309VLJ datasheet(59/192 Pages) NSC

59 / 192 page

The Floppy Disk Controller (FDC) (Logical Device 0)

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Result Phase

The system reads the value 80h from ST0 indicating that an

invalid command was received.

FIGURE 3-5. IBM, Perpendicular, and ISO Formats Supported by the FORMAT TRACK Command

76543210

Result Phase Status Register 0 (STO) (80h)

Gap 0

80 of

SYNC

12 of

IAM

3 of

C2* FC

Gap 1

50 of

3 of

A1*

Gap 2

22 of

SYNC

12 of

SYNC

12 of

3 of

A1*

Data

Gap 3

Program-

able

Gap 4

Gap 0

80 of

SYNC

12 of

IAM

3 of

C2* FC

Gap 1

50 of

3 of

A1*

Gap 2

41 of

SYNC

12 of

SYNC

12 of

3 of

A1*

Data

Gap 3

Program-

able

Gap 4

Gap 1

32 of

3 of

A1*

Gap 2

22 of

SYNC

12 of

SYNC

12 of

3 of

A1*

Data

Gap 3

Program-

able

Gap 4

Index Pulse

IBM

Format

(MFM)

Perpendicular

Format

ISO

Format

(MFM)

Index

Field

Address Field

Data Field

Repeated for each sector

A1* = Data Pattern of A1, Clock Pattern of 0A. All other data rates use gap 2 = 22 bytes.

C2* = Data Pattern of C2, Clock Pattern of 14

Toshiba

Address

PC87309VLJ 数据表(PDF) 59 Page - National Semiconductor (TI)

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