wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 84

• Manufacturer Part Number: wm8918
• Description: Ultra Low Power Dac For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

WM8918
w
AUDIO DATA FORMATS (NORMAL MODE)
In Right Justified mode, the LSB is available on the last rising edge of BCLK before a LRCLK
transition. All other bits are transmitted before (MSB first). Depending on word length, BCLK
frequency and sample rate, there may be unused BCLK cycles after each LRCLK transition.
Figure 45 Right Justified Audio Interface (assuming n-bit word length)
In Left Justified mode, the MSB is available on the first rising edge of BCLK following a LRCLK
transition. The other bits up to the LSB are then transmitted in order. Depending on word length,
BCLK frequency and sample rate, there may be unused BCLK cycles before each LRCLK transition.
Figure 46 Left Justified Audio Interface (assuming n-bit word length)
In I
The other bits up to the LSB are then transmitted in order. Depending on word length, BCLK
frequency and sample rate, there may be unused BCLK cycles between the LSB of one sample and
the MSB of the next.
Figure 47 I2S Justified Audio Interface (assuming n-bit word length)
AFRXDAT/
AIFTXDAT
2
S mode, the MSB is available on the second rising edge of BCLK following a LRCLK transition.
LRCLK
BCLK
MSB
1 BCLK
1
2
3
LEFT CHANNEL
Input Word Length (WL)
n-2
n-1
LSB
n
1/fs
1 BCLK
1
2
3
RIGHT CHANNEL
PD, Rev 4.0, September 2010
n-2
n-1
n
Production Data
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