CS4385
3.3 Digital Interface Formats
The serial port operates as a slave and supports the I²S, Left-Justified, Right-Justified, One-Line
Mode (OLM) and TDM digital interface formats with varying bit depths from 16 to 32 as shown in
Figures 9-19. Data is clocked into the DAC on the rising edge. OLM and TDM configurations are
only supported in software mode.
LRCK
SCLK
SDINx
LRCK
SCLK
SDINx
Left Channel
Right Channel
MSB -1 -2 -3 -4 -5 +5 +4 +3 +2 +1 LSB
MSB -1 -2 -3 -4 +5 +4 +3 +2 +1 LSB
Figure 9. Format 0 - Left Justified up to 24-bit Data
Left Channel
Right Channel
MSB -1 -2 -3 -4 -5
+5 +4 +3 +2 +1 LSB
MSB -1 -2 -3 -4 +5 +4 +3 +2 +1 LSB
Figure 10. Format 1 - I2S up to 24-bit Data
LRCK
SCLK
SDINx
Left Channel
Right Channel
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
32 clocks
Figure 11. Format 2 - Right Justified 16-bit Data
LRCK
SCLK
SDINx 0
Left Channel
Right Channel
23 22 21 20 19 18
76543210
23 22 21 20 19 18
32 clocks
Figure 12. Format 3 - Right Justified 24-bit Data
76543210
20
DS671A1