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WM8955 датащи(PDF) 28 Page - Wolfson Microelectronics plc

номер детали WM8955
подробное описание детали  STEREO DAC FOR PORTABLE AUDIO APPLICATIONS
PDF  43 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8955 датащи(HTML) 28 Page - Wolfson Microelectronics plc

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WM8955L
Product Preview
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Product Preview Rev 0.4 May2003
28
LEFT CHANNEL
RIGHT CHANNEL
DACLRC/
ADCLRC
BCLK
DACDAT/
ADCDAT
n
3
2
1
n-2 n-1
LSB
MSB
n
3
2
1
n-2 n-1
1 BCLK
Input Word Length (WL)
1/fs
Figure 14 DSP Mode Audio Interface (Mode B; LRP = 1)
AUDIO INTERFACE CONTROL
The register bits controlling audio format, word length and master / slave mode are summarised
below.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
1:0
FORMAT
10
Audio Data Format Select
11 = DSP Mode
10 = I
2SFormat
01 = Left justified
00 = Right justified
3:2
WL
10
Audio Data Word Length
11 = 32 bits (see Note)
10 = 24 bits
01 = 20 bits
00 = 16 bits
4LRP
0
I
2S, LJ, RJ Formats
1: Right Channel data
when DACLRC high
0: Right Channel data
when DACLRC low
DSP Format
1: MSB available on
2nd BCLK rising edge
after LRC rising edge
0: MSB available on
1st BCLK rising edge
after LRC rising edge
5
LRSWAP
0
Swap Left and Right Channels
0: No swap (L to L, R to R)
1: Swap (L to R, R to L)
6
MS
0
Master / Slave Mode Control
1: Master Mode
0: Slave Mode
R7 (07h)
Digital Audio
Interface
Format
7
BCLKINV
0
BCLK Invert
1: BCLK inverted
0: BCLK not inverted
Table 18 Audio Data Format Control
Note: Right Justified mode does not support 32-bit data. If WL=11 in Right justified mode, the actual
word length will be 24 bits.



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