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參數(shù)資料
| 型號： | STA304A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 20 POS IMAGE SENSOR SOCKT |
| 中文描述： | 數(shù)字音頻處理器多通道的DDX⑩ |
| 文件頁數(shù)： | 11/30頁 |
| 文件大?。?/td> | 338K |
| 代理商： | STA304A |
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STA304A
6.0 DAP INPUT STAGE
The device provides 3 mutually exclusive input interfaces: I2S, S/PDIF and AC`97. Hereby is a small description
of the characteristics for each of them and a table showing how to select it.
Figure 6.
6.1 Input from I
2
S
Using this input interface a maximum of 4 channels can be sent to the DSP. As detailed in the related paragraph
this I/F can be configured both as master or slave. When in master the sampling frequency is fixed to 48 KHz
and the SRC can be bypassed using the SRC_Bypass configuration bit (in CRA register). If slave operation is
selected the full range between 32KHz and 96KHz is supported but the SRC must always be in the processing
path (no bypass). In order to select this interface the AC97_MODE pin must be tied to GND and the
I2S_SPDIF_Sel bit must be 0.
6.2 Input from S/PDIF
This interface is compliant with the AES/EBU IEC 958, S/PDIF and EIAJ CP-340/1201 professional and con-
sumer standards. The full range from 32 KHz up to 96 KHz is supported but the SRC bypass option must be
switched off. Using the SPDIF_Modebit this interface can be configured as digital or analog input. If the analog
mode is selected the line receiver can decode differential as well as single ended inputs. The receiver consists
of a differential input Schmitt Triggercomparator with 50 mV of hysteresis, which prevents noisy signals from
corrupting the data recovered. The minimum input differential voltage is 200 mV.
If the digital mode is selected only the single ended operation is supported; the input signal should be CMOS
compliant.
In order to select this interface the AC97_MODE pin must be tied to GND and the I2S_SPDIF_Sel must be 1.
6.3 Input from AC`97
In order to select this interface the AC97_MODE pin must be tied to VDD (I2S_SPDIF_Sel bit ‘is don’t care).
The AC`97 interface can be configured either as primary or secondary device using the external configuration
pin SA.
This interface support 4 sampling frequencies, according to the Variable and Double Rate Audio Codec `97
YRAM
SRC
AC97
I2S
S/PDIF
LEFT
RIGHT
SL/CENTER
SR
CENTER
LFE
AC97_Sel
I2S_SPDIF_Sel
SRC_Bypass
PLL
MCK
PLL_Factor
PLL_Bypass
XTI
DSP
DDX
I2S
I2C
YRAM
LEFT
RIGHT
SL/CENTER
SR
CENTER
LFE
/1024
/2 or /8
LRCK
CK_OUT
LRCK
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