Obsolete

Product(s)

- Obsolete

Product(s)

7/14

STA020

Figure 3. Audio Serial Port Formats.

C, U, V Serial Port

The serial input pins for channel status (C), user (U), and validity (V) are sampled during the first bit period

after the active edge of FSYNC for all formats except Format 4. Format 4 is sampled during the second

bit period (coincident with the MSB). In Figure 3, the arrows on SCK indicate when the C, U, and V bits

are sampled. The C, U, and V bits are transmitted with the audio sample entered before FSYNC edge that

sampled it. The V bit, as defined in the audio standards, is set to zero to indicate the audio data is suitable

for conversion to analog. Therefore, when the audio data is errored, or the data is not audio, the V bit

should be set high. The channel status serial input pin (C) is not available in consumer mode when the

CD subcode port is enabled (FC1 = FC0 = high). Any channel status data entered through the channel

status serial input (C) is logically OR’ed with the data entered through the dedicated pins or internally gen-

erated.

FSYNC(out)

MSB

LSB

MSB

LSB

MSB

LEFT

RIGHT

SCK(out)

SDATA(in)

FSYNC(in)

MSB

LSB

MSB

LSB

MSB

LEFT

RIGHT

SCK(in)

SDATA(in)

FSYNC(in)

MSB

LSB

MSB

LSB

MSB

LEFT

RIGHT

SCK(in)

SDATA(in)

FORMAT 0:

FORMAT 1:

FORMAT 2:

(RESERVED)

FSYNC(in)

MSB

LSB

MSB

LSB

MSB

LEFT

RIGHT

SCK(in)

SDATA(in)

FSYNC(in)

LSB

MSB

LSB

SCK(in)

SDATA(in)

FORMAT 3:

FORMAT 4:

FORMAT 5:

LEFT

RIGHT

LSB

MSB

16 Bits

16 Bits

FSYNC(in)

LSB

MSB

LSB

SCK(in)

SDATA(in)

FORMAT 6:

LEFT

RIGHT

LSB

MSB

18 Bits

18 Bits

FSYNC(in)

MSB

LSB

MSB

SCK(in)

SDATA(in)

FORMAT 7:

LEFT

RIGHT

MSB

LSB

D97AU604