GS1503 Gennum Corporation, GS1503 Datasheet - Page 50

• Manufacturer Part Number: GS1503
• Description: HD Embedded Audio Codec
• Manufacturer: Gennum Corporation

2.6.3 Audio Clock Phase Locked Loop
Figure 39 shows the configuration for deriving the
6.144MHz audio clock in AES/EBU and serial audio output
modes. The GS1503 will internally synchronize the audio
output to the corresponding ACLK. This configuration is not
required when DEC_MODE is set HIGH. See the Reference
Design Section 3 for circuit specifics.
2.6.4 Audio Data Packet Detection
The audio data packet detect registers will be set HIGH
when a corresponding audio group DID has been detected
in the Chroma channel of the input video stream. Host
Interface register 013h, bits 7-4, report the individual audio
groups detected.
Register Settings
ADPG4_DET
ADPG3_DET
ADPG2_DET
ADPG1_DET
Y/C b / C r [19:0]
NAME
Audio group 4 data packet detection (1:Detection)
Audio group 3 data packet detection (1:Detection)
Audio group 2 data packet detection (1:Detection)
Audio group 1 data packet detection (1:Detection)
VIN[19:0]
ACLKA
ACLKB
GS1503
DESCRIPTION
Fig. 39 Block Diagram of GS1503 Audio Clock PLL
PLLCNTB
PLLCNTA
AOUT1/2
AOUT3/4
AOUT5/6
AOUT7/8
6.144MHz (128 fs)
6.144MHz (128 fs)
50
Audio Channels 1 & 2
Audio Channels 3 & 4
Audio Channels 5 & 6
Audio Channels 7 & 8
Pass
Filter
Pass
Filter
Low
Low
ADDRESS
013
24.576MHz
24.576MHz
VCXO
VCXO
BIT
7
6
5
4
SETTING
-
-
-
-
÷4
÷4
DEFAULT
15879 - 1
0
0
0
0