Cirrus Logic CS4385A - Manual (Page 23)

DS837F2 23
CS4385A
4.3 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 - 18 .
Data is clocked into the DAC on the rising edge. OLM configuration is only supported in Software Mode.
LRCK
SCLK
Left Channel Right Channel
SDINx +3 +2 +1 +5 +4 -1 -2 -3 -4 -5 +3 +2 +1 +5 +4 -1 -2 -3 -4 MSB LSB MSB LSB
Figure 9. Format 0 - Left-Justified up to 24-bit Data
LRCK
SCLK
Left Channel Right Channel
SDINx +3 +2 +1 +5 +4 -1 -2 -3 -4 -5 +3 +2 +1 +5 +4 -1 -2 -3 -4 MSB MSB LSB LSB
Figure 10. Format 1 - I²S up to 24-bit Data
LRCK
SCLK
Left Channel
Right Channel
SDINx 6 5 4 3 2 1 0 9 8 7 15 14 13 12 11 10 6 5 4 3 2 1 0 9 8 7 15 14 13 12 11 10
32 clocks
Figure 11. Format 2 - Right-Justified 16-bit Data
LRCK
SCLK
Left Channel
Right Channel
SDINx 6 5 4 3 2 1 0 9 8 7 15 14 13 12 11 10 1 0 6 5 4 3 2 1 0 9 8 7 15 14 13 12 11 10 17 16 17 16
32 clocks
19 18 19 18
Figure 12. Format 4 - Right-Justified 20-bit Data
LRCK
SCLK
Left Channel
Right Channel
SDINx 6 5 4 3 2 1 0 9 8 7 15 14 13 12 11 10 1 0 6 5 4 3 2 1 0 9 8 7 15 14 13 12 11 10 17 16 17 16
32 clocks
Figure 13. Format 5 - Right-Justified 18-bit Data