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STA016A View Datasheet(PDF) - STMicroelectronics

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STA016A Datasheet PDF : 43 Pages
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STA016A
3 OVERVIEW
The device can decode/process data coming from three possible sources, as showed in Figure 2:
CDDSP serial link: using this input interface, besides MP3 encoded data CD, it's possible to playback
also standard Audio CD using the available volume and tone equalizer features of the device and
allowing the use of only one D/A converter with no external analog switch.
SDI input interface: through this input interface it's possible to decode any MP3 bitstream coming, for
instance, from an external flash memory.
I2S input interface: this interface can be used to process an external audio source (tuner, for instance)
through the DSP based volume and tone controls:this BYPASS mode can avoid the use of additional
D/A converters or postprocessing units.
3.1 MP3 decoder engine
The MP3 decoder engine is able to decode any Layer III compliant bitstream: MPEG1, MPEG2 and MPEG2.5
streams are supported.
Decoded audio data goes through a software volume control and a two-band equalizer blocks before feeding
the output I2S interface. This results in no need for an external audio processor.
Table 4. MPEG Sampling Rates (KHz)
MPEG 1
48
44.1
32
MPEG 2
24
22.05
16
MPEG 2.5
12
11.025
8
Figure 3. Block Diagram
CD_BCK
CD_SDI
CD_LRCK
BS_BCK
BS_SDI
BS_LRCK
DREQ
BCKI
SDI
LRCKI
STB
RQST
SCL
SDA
CDDSP
I/F
SDI
I/F
I2S IN
I/F
I2C
I/F
CDROM DECODER (C3)
SYNC
DETECT.
DESCRAM.
ECC/EDC
INPUT SELECTOR
SECTOR
BUFFER
MMDSP
CORE
- ISO9660 + JOLIET
- BCI
- MP3
PCM OUTPUT
BUFFER
I2S OUT
I/F
I2C
PLL
REG BANK
OSC
GPSO
I/F
BCKO
SDO
LRCKO
GPSO_CK
GPSO_SDO
GPSO_REQ
OSCK
XTI XTO
D04AU1565
The basic functions of the device can be fully operated via the I2C bus. Besides that the GPSO interface can be
used to move huge amount of data this fast and flexible interface can achieve transfer rates up to 5 Mbit/s.
The embedded DSP firmware implements all the layers required to decode a standard data CD, as shown in
the Figure 4:
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