WM8900LGEFK/RV Wolfson Microelectronics, WM8900LGEFK/RV Datasheet - Page 69

• Manufacturer Part Number: WM8900LGEFK/RV
• Description: Audio CODECs Ultra Low Power Hi-Fi CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8900LGEFK/RV

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
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Figure 38 DSP/PCM Mode Audio Interface (mode B, AIF_LRCLKINV =0, Slave)
AUDIO DATA FORMATS (TDM MODE)
TDM is supported in master and slave mode and is enabled by register bits AIF_ADC_TDM and
AIF_DAC_TDM. All audio interface data formats support time division multiplexing (TDM) for ADC
and DAC data.
Two time slots are available (Slot 0 and Slot 1), selected by register bits AIFADC_TDM_CHAN and
AIFDAC_TDM_CHAN which control time slots for the ADC data and the DAC data.
When TDM is enabled, the ADCDAT pin will be tri-stated immediately before and immediately after
data transmission, to allow another ADC device to drive this signal line for the remainder of the
sample period.
When TDM is enabled, BCLK frequency must be high enough to allow data from both time slots to
be transferred. The number of BCLK cycles from the start of Slot 0 to the start of Slot 1 is
determined by the selected word length of the applicable interface. The timing of Slot 0 and Slot 1
also depends upon the selected data format as shown in Figure 39 to Figure 43.
Timing diagrams for the various interface formats in TDM mode are shown below for the ADC.
Similar timings apply to the DACDAT and DACLRC pins.
Figure 39 TDM in Left-Justified Mode
PD, August 2008, Rev 4.0
WM8900
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