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STA015T 데이터시트(PDF) 10 Page - STMicroelectronics

부품명 STA015T
상세설명  MPEG 2.5 LAYER III AUDIO DECODER WITH ADPCM CAPABILITY
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA015T 데이터시트(HTML) 10 Page - STMicroelectronics

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SCLK_POL=0
SCLK_POL=4
DATA IGNORED
DATA VALID
SCKR
SCKR
SDI
BIT_EN
D98AU968A
DATA
IGNORED
Figure 9. Serial Input Interface Clocks
DATA
SOURCE
µP
MPEG
DECODER
IIC
D98AU912
IIC
SDO
SCKT
LRCKT
SERIAL AUDIO INTERFACE
SDI
SCKR
BIT_EN
XTO
DAC
RX
TX
XTI
FILT
PLL
OCLK
SCL
SDA
DATA_REQ
Figure 8. MPEG Decoder Interfaces.
2.2 - Serial Input Interface
STA015 receives the input data (MSB first)
thought the Serial Input Interface (Fig.5). It is a
serial communication interface connected to the
SDI (Serial Data Input) and SCKR (Receiver Se-
rial Clock).
The interface can be configured to receive data
sampled on both rising and falling edge of the
SCKR clock. The BIT_EN pin, when set to low,
forces the bitstream input interface to ignore the
incoming data. For proper operation Bit_EN line
should be toggled only when SCRK is stable low
(for both SCLK_POL configuration) The possible
configurations are described in Fig. 9.
2.3 - PLL & Clock Generator System
When STA015 receives the input clock, as de-
scribed in Section 2.1, and a valid layer III input
bitstream, the internal PLL locks, providing to the
DSP Core the master clock (DCLK), and to the
Audio Output Interface the nominal frequencies of
the incoming compressed bit stream. The STA015
PLL block diagram is describedin Figure 5.
The audio sample rates are obtained dividing the
oversampling clock (OCLK) by software programma-
ble factors. The operation is done by STA015 em-
beddedsoftware and it is transparent to the user.
The STA015 PLL can drive directly most of the com-
mercial DACs families, providing an over sampling
clock, OCLK, obtained dividing the VCO frequency
with a software programmable dividers.
2.4 - GPSO Output Interface
In order to retrieve ADPCM encoded data a Gen-
eral Purpose Serial Output interface is available
(in TQFP44 and LFBGA64 packages only). The
maximum
frequency
for
clock
is
the
GPSO_SCKR DSP system clock frequency di-
vided by 3 (i.e. 8.192 MHz @ 24.58MHz). The in-
terface is based on a simple and configurable 3-
lines protocol, as described by figure 10.
STA015-STA015B-STA015T
10/44


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