wm9081 Wolfson Microelectronics plc, wm9081 Datasheet - Page 58

• Manufacturer Part Number: wm9081
• Description: Mono Dac With 2.6w Class Ab/d Speaker Driver, Dynamic Range Controller And Retune Mobile Parametric Equalizer
• Manufacturer: Wolfson Microelectronics plc

WM9081
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Figure 45 DSP Mode Audio Interface (mode B, AIF_LRCLK_INV=1, Slave)
PCM operation is supported in DSP interface mode. Mono PCM data received by the WM9081 will
be treated as Left Channel data. The left channel must be selected by the WM9081 in order for this
data to be routed to the output drivers.
AUDIO DATA FORMATS (TDM MODE)
TDM is supported in master and slave mode and is enabled using the AIFDAC_TDM_MODE register
field. All audio interface data formats support time division multiplexing (TDM). The
AIFDAC_TDM_MODE identifies the number of stereo time slots in the received data. Up to four
stereo time slots can be selected. The AIFDAC_TDM_SLOT field identifies which of the available
time slots contains the data that is to be received by the WM9081.
When TDM is enabled, BCLK frequency must be high enough to allow data from all time slots to be
transferred. The relative timing of the audio interface timeslots depends upon the selected data
format as shown in Figure 46 to Figure 50. A maximum of four stereo time slots can be supported in
each data format. The following figures illustrate only a subset of the available options.
Figure 46 TDM in Right-Justified Mode - 2 Stereo Time Slots
Figure 47 TDM in Left-Justified Mode - 3 Stereo Time Slots
DACDAT
LRCLK
BCLK
SLOT 0
LEFT CHANNEL
SLOT 1
SLOT 2
1/fs
SLOT 0
RIGHT CHANNEL
SLOT 1
PP, Rev 3.0, April 2009
SLOT 2
Pre-Production
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