wm9714l Wolfson Microelectronics plc, wm9714l Datasheet - Page 28

• Manufacturer Part Number: wm9714l
• Description: Ac?97 Audio Codec
• Manufacturer: Wolfson Microelectronics plc

WM9714L
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In DSP mode, the left channel MSB is available on either the 1st (mode B) or 2nd (mode A) rising
edge of PCMCLK (selectable by FSP) following a rising edge of PCMFS. Right channel data
immediately follows left channel data. Depending on word length, PCMCLK frequency and sample
rate, there may be unused PCMCLK cycles between the LSB of the right channel data and the next
sample.
Figure 7 DSP Mode Audio Interface (mode A, FSP=0)
Figure 15 DSP Mode Audio Interface (mode B, FSP=1)
PCMADC/
PCMADC/
PCMCLK
PCMDAC
PCMCLK
PCMDAC
PCMFS
PCMFS
MSB
1
1 BCLK / VXCLK
1 BCLK / VXCLK
MSB
1
2
2
3
Input Word Length (WL)
LEFT CHANNEL
3
Input Word Length (WL)
LEFT CHANNEL
n-2 n-1
n-2 n-1
LSB
n
LSB
n
1
1
2
2
3
RIGHT CHANNEL
3
1/fs
RIGHT CHANNEL
1/fs
n-2 n-1
n-2 n-1
n
n
PP, Rev 3.2, October 2008
Pre-Production
28