AD1892 datasheet(9/24 Pages) AD

9 / 24 page

AD1892

REV. 0

–9–

As noted above, the Channel Status bit from each subframe

accumulates over a 192 subframe period. The standards allow for

the Channel Status bit in each subframe to be independent, but

ordinarily the Channel Status bit in the two subframes of each

frame are the same. The Channel Status bits are defined

VALIDITY

USER DATA

CHANNEL STATUS DATA

EVEN PARITY BIT

MSB

AUDIO DATA

27 28 29 30 31

LSB

AUX DATA

PREAMBLE

(EXPANDED)

A = LEFT CHANNEL

B = RIGHT CHANNEL

(EXPANDED)

A0 B0 A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 A8 B8

A188 B188 A189 B189 A190 B190 A191 B191

SUBFRAME

FRAME

CHANNEL STATUS BLOCK (384 AUDIO SAMPLES)

192 LEFT, 192 RIGHT

Figure 5. Block, Frame and Subframe Organization

RESERVED

EMPHASIS

AUDIO

PRO = 0

BYTE 0

191

BLOCK

BIT

BIT 0

CATEGORY CODE

SOURCE NUMBER

RESERVED

MODE

COPY

CHANNEL NUMBER

CLOCK ACCURACY

Figure 6. Consumer Channel Status Block Structure

differently for the consumer audio standards and the profes-

sional audio standards. The 192 Channel Status bits are

organized into 24 bytes and have the interpretations shown in

Figures 6 through 16.

EMPHASIS

LOCK

AUDIO

PRO = 1

BYTE 0

119

151

183

191

BLOCK

BIT

BIT 0

CHANNEL MODE

USER BIT MANAGEMENT

RESERVED

WORD LENGTH

AUX USE

RESERVED

REFERENCE

RESERVED

ALPHANUMERIC CHANNEL ORIGIN DATA

ALPHANUMERIC CHANNEL DESTINATION DATA

LOCAL SAMPLE ADDRESS CODE

(32-BIT BINARY)

TIME OF DAY CODE

(32-BIT BINARY)

RESERVED

RELIABILITY FLAGS

CYCLIC REDUNDANCY CHECK CHARACTER

Figure 7. Professional Channel Status Block Structure

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