WM8351CGEB/RV WOLFSON [Wolfson Microelectronics plc], WM8351CGEB/RV Datasheet - Page 93
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WM8351CGEB/RV
Manufacturer Part Number
WM8351CGEB/RV
Description
Manufacturer
WOLFSON [Wolfson Microelectronics plc]
Datasheet
1.WM8351CGEBRV.pdf
(330 pages)
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Figure 54 DSP/PCM Mode Audio Interface (mode B, AIF_LRCLK_INV=1)
The digital audio interface on WM8351 has the facility of tri-stating the ADCDAT pin to allow multiple
data sources to operate on the same bus. Time division multiplexing (TDM) is also supported,
allowing audio output data to be transferred simultaneously from two different sources.
TDM mode is enabled for the ADC and DAC by register bits AIFADC_TDM and AIFDAC_TDM
respectively. TDM slot selection for the WM8351 is set for the ADC and DAC by register bits
AIFADC_TDM_CHAN and AIFDAC_TDM_CHAN respectively, as defined in Table 46. When not
actively transmitting data, the ADCDAT pin will be tristated in TDM mode, to allow other devices to
transmit data.
13.10.3 TDM DATA FORMATS
All selectable data formats support TDM. The allocation of time slots is controlled by register bits
AIFADC_TDM_CHAN and AIFDAC_TDM_CHAN. Two possible slots (SLOT0 and SLOT1) are
available for the ADC and for the DAC.
Timing signals for the various interface formats in TDM mode are shown below for the ADC. Similar
slot allocation will exist for the DAC.
13.10.2 AUDIO INTERFACE TDM MODE
Left Justified Mode: SLOT0 and SLOT1 are defined as shown below. The number of BCLK cycles
from the start of SLOT0 to the start of SLOT1 is determined by the selected word length of the
interface of the WM8351.
Figure 55 Left Justified Mode with TDM
PD, April 2012, Rev 4.5
WM8351
93
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