Bit

Byte

7

6

5

4

3

2

1

0

0

Operation code (42h)

1

Reserved

MSF

(Mandatory)

Reserved

2

Reserved

SubQ

(Mandatory)

Reserved

3

Sub-channel Data Format

4

Reserved

5

Reserved

6

Track Number

7

MSB

Allocation Length

LSB

8

9

Reserved

10

Reserved

11

Reserved

Bit

Byte

7

6

5

4

3

2

1

0

Sub Channel Data Header

0

Reserved

1

Audio Status

2

MSB

Sub-channel Data Length

LSB

3

CD-ROM Current Position Data Block

4

Sub Channel Data Format Code (01h)

5

ADR

Control

6

Track Number

7

Index Number

8

MSB

Absolute CD-ROM Address

LSB

9

10

11

12

MSB

Track Relative CD-ROM Address

LSB