WM8955BL Wolfson Microelectronics, WM8955BL Datasheet - Page 28

• Manufacturer Part Number: WM8955BL
• Description: Stereo DAC
• Manufacturer: Wolfson Microelectronics

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WM8955BL
Figure 16 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.
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.
R7 (07h)
Digital Audio
Interface
Format
REGISTER
ADDRESS
1:0
3:2
4
5
6
7
BIT
FORMAT
WL
LRP
LRSWAP
MS
BCLKINV
LABEL
10
10
0
0
0
0
DEFAULT
Audio Data Format Select
11 = DSP Mode
10 = I
01 = Left justified
00 = Right justified
Audio Data Word Length
11 = 32 bits (see Note)
10 = 24 bits
01 = 20 bits
00 = 16 bits
I
1: Invert LRCLK
polarity
0: Normal LRCLK
polarity
Swap Left and Right Channels
0: No swap (L to L, R to R)
1: Swap (L to R, R to L)
Master / Slave Mode Control
1: Master Mode
0: Slave Mode
BCLK Invert
1: BCLK inverted
0: BCLK not inverted
2
S, LJ, RJ Formats
2
S Format
DESCRIPTION
PD Rev 4.1 February 2007
DSP Format
1: MSB available on
1
after LRC rising
edge
0: MSB available on
2
edge after LRC
rising edge
st
nd
BCLK rising edge
BCLK rising
Production Data
28