GS1503B Datasheet, PDF (52/90 Pages) Gennum Corporation – HD Embedded Audio CODEC Data Sheet

5. Demultiplex Mode
5.1 Functional Overview
The GS1503B 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 GS1503B 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_b/C_r input with TRS and Line Numbers
• 20-bit scrambled input
The video output format can be one of the following configurations:
• 20-bit scrambled output
• 10-bit Y and C_b/C_r output
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
cascading two devices in parallel.
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 GS1503B will also demultiplex arbitrary data packets as defined in SMPTE 291M.
The arbitrary data packets can serve as an auxiliary data signal for proprietary
applications. The GS1503B 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 GS1503B in Demultiplex Mode, set the MUX/DEMUX external pin HIGH.
GS1503B HD Embedded Audio CODEC
Data Sheet
37953 - 1
December 2009
52 of 90