STA310 STMicroelectronics, STA310 Datasheet - Page 18

IC AUDIO DECODER 6+2CH 80-TQFP

STA310

Manufacturer Part Number
STA310
Description
IC AUDIO DECODER 6+2CH 80-TQFP
Manufacturer
STMicroelectronics
Type
Audio Decoderr
Datasheet

Specifications of STA310

Applications
HDTV, Players, Receivers, Set-Top Boxes
Voltage - Supply, Analog
2.5V
Voltage - Supply, Digital
2.5V
Mounting Type
Surface Mount
Package / Case
80-TQFP, 80-VQFP
Audio Codec Type
MP3 Decoder
No. Of Dacs
3
No. Of Input Channels
2
No. Of Output Channels
6
Adc / Dac Resolution
32bit
Sampling Rate
192kHz
Interface Type
I2C, Serial, Parallel
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-8856
STA310

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STA310
Figure 9.
LRCLKIN
DSTR
SIN
Transferred data
Discarded data
4.5 Streams parsers
The parsing stage is operated by two parts: the packet parser and the audio parser.
The packet parser unpacks stream, sorts packets and transmit data to the audio parser. The audio parser ver-
ifies the stream syntax, extracts non-audio data and sends audio data to the frame buffer.
Packet parser
Before unpacking packets and transmitting data, the packet parser needs to detect the packet start by recog-
nizing the packet synchronization word. It is possible to force the parser to search for two packet synchronization
words before starting to unpack and transmit.
This is done by setting the register PACKET_LOCK to 1. Otherwise, the packet parser will start handling the
stream once it has detected information matching the packet synchronization word.
The packet parser is also able to perform selective decoding: it can decode audio packets that are matching a
specified Id. This Id is specified in AUDIO_ID and AUDIO_ID_EXt registers, and the function is enabled by set-
ting the AUDIO_ID_EN register.
Audio parser
The audio parser needs to detect the audio synchronization word corresponding to the type of stream that must
be decoded. It is possible to force the audio parser to detect more than one synchronization word before pars-
ing.
This is done by setting the SYNC_LOCK register to a value between 1 and 3 - number of supplementary sync
words to detect before considering to be synchronized.
The status of synchronization of both parsers is provided in the register SYNC_STATUS. Each time the syn-
chronization status of one of the two parsers changes, the interrupt SYN is generated (if enabled) and the status
can be read in SYNC_STATUS.
4.6 Decoding modes
4.6.1 AC-3
The STA310 is Dolby Digital certified for class A products. The decoder must be programmed so to specify the
stream format as AC-3 encoded: register DECODESEL = 0.
In the sections below are provided the modes specific to the AC-3 decoding.
4.6.1.1 Compression modes
Four compression modes are provided in the STA310:
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