GS1503 Gennum Corporation, GS1503 Datasheet - Page 48

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

2.6.2 Digital Audio Output Timing
2.6.2.1 AES/EBU Format Output
A 6.144MHz (128fs) audio clock must be supplied to the
ACLKA and ACLKB inputs. ACLKA is used to clock AES/
EBU digital audio signal for channels 1 to 4 (AOUT1/2 and
AOUT3/4). ACLKB is used to clock AES/EBU digital audio
signal for channels 5 to 8 (AOUT5/6 and AOUT7/8). In AES/
EBU output mode, the audio word clock inputs WCINB and
WCINB should be grounded. See Figure 37 for timing.
The user can access the Audio Channel Status Block
information via the AUDIO_CS[183:0] bits in Host Interface
registers 058h to 06Eh. To read the Audio Channel Status
information, the CS_MODE bit 3 of Host Interface register
06Fh should be set HIGH. The embedded audio channel
Register Settings
CH_SEL[2:0]
CS_WEND
CS_MODE
CS_RQST
NAME
AOUT1/2, AOUT3/4
AOUT5/6, AOUT7/8
ACLKA/B
Audio Channel Status write flag
(1: Data ready)
Audio Channel Status request
(1: enable)
0: Audio Channel Status replace
1: Audio Channel Status demultiplex
Audio Channel Status select
Y/C b / C r [19:0]
6.144MHz (128 fs)
6.144MHz (128 fs)
Fig. 37 AES/EBU Audio Output Configuration and Timing
DESCRIPTION
6.144MHz
VIN[19:0]
ACLKA
ACLKB
GS1503
48
from which the Channel Status information is to be
extracted is set in the CH_SEL[2:0] bits 2-0 of Host
Interface register 06Fh. The CH_SEL[2:0] setting for audio
channel 1 is 000b, through to 111b for channel 8. The
CS_RQST bit must be set HIGH to begin the process of
extracting the Audio Channel Status information. Once
extracted, the GS1503 will set CS_WEND bit HIGH and the
user can access the data for Host Interface registers 058h
to 06Eh.
When CS_MODE is set LOW, the Audio Channel Status
information in the AES/EBU audio outputs will be replaced
with data programmed in the AUDIO_CS[183:0] bits of Host
Interface registers 058h to 06Eh.
AOUT1/2
AOUT3/4
AOUT5/6
AOUT7/8
ADDRESS
06F
Audio Channels 1 & 2
Audio Channels 3 & 4
Audio Channels 5 & 6
Audio Channels 7 & 8
BIT
2-0
5
4
3
SETTING
1
1
-
-
DEFAULT
000b
15879 - 1
0
0
0