AD1849K

REV. 0

–13–

Control Byte 4, Test Register

Data 7

Data 6

Data 5

Data 4

Data 3

Data 2

Data 1

Data 0

000000

ENL

ADL

39

38

37

36

35

34

33

32

ENL

Enable loopback testing:

0

Disabled

1

Enabled

ADL

Loopback mode:

0

Digital loopback from Data/Control receive to Data/Control transmit (D-D)

1

Analog loopback from DACs to ADCs (D-A-D)

Control Byte 5, Parallel Port Register

Data 7

Data 6

Data 5

Data 4

Data 3

Data 2

Data 1

Data 0

PIO1

PIO0

000000

31

30

29

28

27

26

25

24

PIO1:0 Parallel I/O bits for system signaling. PIO bits do not affect Codec operation.

Control Byte 6, Reserved Register

Data 7

Data 6

Data 5

Data 4

Data 3

Data 2

Data 1

Data 0

00000000

23

22

21

20

19

18

17

16

Reserved bits should be written as 0.

Control Byte 7, Revision Register

Data 7

Data 6

Data 5

Data 4

Data 3

Data 2

Data 1

Data 0

0010

REVID3

REVID2

REVID1

REVID0

15

14

13

12

11

10

9

8

REVID3:0

Silicon revision identification. Reads greater than or equal to 0010 (i.e., 0010, 0011, etc.) for the AD1849K.

Control Byte 8, Reserved Register

Data 7

Data 6

Data 5

Data 4

Data 3

Data 2

Data 1

Data 0

00000000

76543210

Reserved bits should be written as 0.