GS2970A datasheet(84/150 Pages) SEMTECH

Part #	GS2970A

Description	3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing

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Manufacturer	SEMTECH [Semtech Corporation]

Direct Link	http://www.semtech.com

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84 / 150 page

GS2970A 3Gb/s, HD, SD SDI Receiver

Data Sheet

54244 - 2

September 2012

84 of 150

Figure 4-38:Serial Audio, Left Justified, MSB First

Figure 4-39:Serial Audio, Left Justified, LSB First

Figure 4-40:Serial Audio, Right Justified, MSB First

Figure 4-41:Serial Audio, Right Justified, LSB First

4.19.2.1 AES/EBU Mode

In AES/EBU output mode, the audio de-embedder uses a 128fs (6.144MHz audio bit

clock) clock as shown in Figure 4-42.

Figure 4-42:AES/EBU Audio Output to Bit Clock Timing

4.19.2.2 Audio Data Packet Extraction Block

The audio de-embedder looks for audio data packets on every line of the incoming

video.

The audio data must be embedded according to SMPTE 272M (SD) or SMPTE 299M (HD

or 3G).

WCLK

ACLK

AOUT[8/7:2/1] 23

MSB

0

2

21

2

3

4

5

6

21

LSB

23

MSB

0

2

21

2

3

4

5

6

21

LSB

Channel A (Left)

Channel B (Right)

WCLK

ACLK

AOUT[8/7:2/1]

0

LSB

3

2

122

21

20

19

18

17

2

MSB

0

LSB

3

2

122

21

20

19

18

17

2

MSB

Channel A (Left)

Channel B (Right)

WCLK

ACLK

AOUT[8/7:2/1]

23

MSB

0

2

21

2

20

17

18

19

21

LSB

23

MSB

0

2

21

2

20

17

18

19

21

LSB

Channel A (Left)

Channel B (Right)

WCLK

ACLK

AOUT[8/7:2/1]

0

LSB

3

2

122

21

36

5

4

2

MSB

0

LSB

3

2

122

21

36

5

4

2

MSB

Channel A (Left)

Channel B (Right)

AMCLK

(128fs)

AOUT_1/2, AOUT_3/4

AOUT_5/6, AOUT_7/8

6.144MHz

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