GS1503 Gennum Corporation, GS1503 Datasheet - Page 41

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

2. DEMULTIPLEX MODE
2. DEMULTIPLEX MODE
2. DEMULTIPLEX MODE
2. DEMULTIPLEX MODE
2.1 FUNCTIONAL OVERVIEW
The GS1503 HD Embedded Audio CODEC fully supports
the demultiplexing of Audio Data Packets, Audio Control
Packets and Arbitrary Data Packets as per SMPTE 291M
and 299M. The device can be configured to operate with all
video standards defined in SMPTE 292M, levels A through
M. The GS1503 also supports the 1080/24PsF, 25PsF and
30PsF video formats as described in SMPTE RP211.
The video input format can be one of the following
configurations:
10-bit Y and C
20-bit scrambled input
The video output format can be one of the following
configurations:
20-bit scrambled output
10-bit Y and C
Up to a maximum of 8 channels of 48kHz digital audio can
be demultiplexed per device. The audio output format can
be selected as either AES/EBU, or one of two serial audio
data output modes. A maximum of 16 channels of audio
can be demultiplexed by serially cascading two devices.
Table 10: Supported Video Standards
VM [3:0]
1110b
1100b
1000b
1010b
1111b
0010b
0100b
0110b
0000b
0001b
0011b
0101b
0111b
b
b
/C
/C
r
r
1035i (30 & 30/1.001 Hz)
1080i (25 Hz)
1080i/1080sF (30 & 30/1.001 Hz)
1080i/1080sF (25 Hz)
1080sF (24 & 24/1.001 Hz)
1080p (30 & 30/1.001 Hz)
1080p (25 Hz)
1080p (24 & 24/1.001 Hz)
720p (60 & 60/1.001 Hz)
720p (30 & 30/1.001 Hz)
720p (50 Hz)
720p (25 Hz)
720p (24 & 24/1.001 Hz)
input with TRS and Line Numbers
output
INPUT FORMAT
All other settings are reserved
41
REFERENCE SMPTE DOCUMENT
Audio control packets, as defined in SMPTE 299M, can also
be demultiplexed to obtain information about the nature of
the embedded audio data. The contents of the audio
control packet are stored in registers of the Host Interface.
The GS1503 will also demultiplex arbitrary data packets as
defined in SMPTE 291M. The arbitrary data packets can
serve
applications. The GS1503 can be configured to demultiplex
arbitrary data packets and output them at dedicated
external pins or via the Host Interface registers. Up to a
maximum of 255 8-bit words can be demultiplexed
(excluding Ancillary Data Flags and Checksum).
To use the GS1503 in Demultiplex Mode, set the
MUX/DEMUX external pin HIGH.
2.2 VIDEO STANDARD
The video standard is selected from the VM[3:0] external
pins or VM[3:0] bits 3-0 in Host Interface register 000h. To
configure the video standard via the Host Interface, VM_SEL
bit 7 in Host Interface register 000h must be set HIGH. The
GS1503 will default to the VM[3:0] external pin setting. The
supported video standards are listed in Table 10.
.
as
274M, RP211
274M, RP211
RP211
260M
295M
274M
274M
274M
296M
296M
296M
296M
296M
an
auxiliary
data
signal
SMPTE 292M LEVEL
for
G, H
A, B
D, E
L, M
J, K
C
F
I
proprietary
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