wm8770 Wolfson Microelectronics plc, wm8770 Datasheet - Page 23

• Manufacturer Part Number: wm8770
• Description: 24-bit, 192khz 8-channel Codec With Volume Control
• Manufacturer: Wolfson Microelectronics plc

Production Data
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DSP EARLY MODE
In DSP early mode, the MSB of DAC channel 1 left data is sampled by the WM8770 on the second
rising edge on BCLK following a DACLRC rising edge. DAC channel 1 right and DAC channels 2, 3
and 4 data follow DAC channel 1 left data (Figure 17).
Figure 17 DSP Early Mode Timing Diagram – DAC Data Input
The MSB of the left channel ADC data is output on DOUT and changes on the first falling edge of
BCLK following a low to high ADCLRC transition and may be sampled on the rising edge of BCLK.
The right channel ADC data is contiguous with the left channel data (Figure 18)
Figure 18 DSP Early Mode Timing Diagram – ADC Data Output
DACLRC
ADCLRC
DOUT
DIN1
BCK
BCK
MSB
MSB
1 BCLK
1
1 BCLK
1
Input Word Length (IWL)
Input Word Length (IWL)
2
LEFT CHANNEL
2
CHANNEL 1
LEFT
n-1
n-1
LSB
LSB
n
n
1
1
RIGHT CHANNEL
2
2
CHANNEL 1
RIGHT
n-1
n-1
n
1/fs
n
1/fs
CHANNEL 2
1
LEFT
2
CHANNEL 4
NO VALID DATA
RIGHT
n-1
PD Rev 4.2 March 2008
n
NO VALID DATA
1 BCLK
WM8770
1 BCLK
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