GS1503-CFZ Gennum Corp., GS1503-CFZ Datasheet - Page 53

• Manufacturer Part Number: GS1503-CFZ
• Description: HD EMBEDDED AUDIO CODEC
• Manufacturer: Gennum Corp.

2.7 DEMULTIPLEX CASCADE MODE
Two GS1503 devices can be cascaded in parallel to allow
up to 16 channels of audio to be demultiplexed (only one
device requires CASCADE to be set HIGH). Figure 40
shows the cascade architecture for a 16-channel system. To
configure the GS1503 for cascade mode, the CASCADE
Register Settings
2.8 AUDIO CONTROL PACKETS
2.8.1 Audio Control Packet Detection
The audio control packet detect registers will be set HIGH
when a corresponding audio group DID has been detected
in the Luma channel of the input video stream. Host
Interface register 020h, bits 7-4, report the individual audio
groups detected.
CASCADE
NAME
Cascade enable (1: Enabled)
Fig. 40 Demultiplexing 16 Channels of Audio using Cascade Architecture
Y/C b /C r [19:0]
DESCRIPTION
+3.3V
VIN[19:0]
CASCADE
VIN[19:0]
CASCADE
53 of 83
GS1503
GS1503
VOUT[19:0]
VOUT[19:0]
AOUT1/2
AOUT3/4
AOUT5/6
AOUT7/8
AOUT1/2
AOUT3/4
AOUT5/6
AOUT7/8
external pin or CASCADE bit 7 of Host Interface register
014h is set HIGH. When set HIGH, the GS1503 will default
to audio groups 3 and 4. When set LOW, the GS1503 will
default to audio groups 1 and 2.
2.8.2 Audio Control Packet DID Setting
To demultiplex audio control packets for audio channels 1
to 4 (AOUT1/2 and AOUT3/4), the CTRONA bit 2 of Host
Interface register 02Fh is set HIGH. To demultiplex audio
control packets for audio channels 5 to 8 (AOUT5/6 and
AOUT7/8), the CTRONB bit 2 of Host Interface register
020h is set HIGH.
Audio Channels 11 & 12
Audio Channels 13 & 14
Audio Channels 15 & 16
Audio Channels 9 & 10
Audio Channels 1 & 2
Audio Channels 3 & 4
Audio Channels 5 & 6
Audio Channels 7 & 8
ADDRESS
014
Y/C b /C r [19:0]
Y/C b /C r [19:0]
BIT
Group 1
Group 2
Group 3
Group 4
7
Audio
Audio
Audio
Audio
SETTING
1
DEFAULT
15879 - 4
0