Cirrus Logic CS4349 - Manual (Page 19)

DS782F2 19
CS4349
4.3 Digital Interface Format
The device will accept audio samples in 1 of 8 digital interface formats, as shown in Table 13 on page 24
for Stand-Alone Mode and Table 14 on page 29 for Control Port Mode.
The desired serial audio interface format is selected via the DIF[2:0] bits in Control Port Mode (see
Section 8.2.1 ), or the DIF[2:0] pins in Stand-Alone Mode (see Section 5.1 ). For illustrations of the required
relationship between LRCK, SCLK and SDIN, see Figures 11 - 13 . For all formats, SDIN is valid on the rising
edge of SCLK.
For more information about serial audio formats, refer to the Cirrus Logic Application Note AN282,
The 2-Channel Serial Audio Interface: A Tutorial, available at
www.cirrus.com .
+3 +2 +1 +5 +4 MSB -1 -2 -3 -4 -5 +3 +2 +1 +5 +4 -1 -2 -3 -4 LSB MSB LSB
Left Channel Right Channel
LRCK
SCLK
SDIN
Figure 11. Left-Justified up to 24-Bit Data
+3 +2 +1 +5 +4 MSB -1 -2 -3 -4 -5 +3 +2 +1 +5 +4 -1 -2 -3 -4 MSB LSB LSB
Left Channel Right Channel LRCK
SCLK
SDIN
Figure 12. I²S, up to 24-Bit Data
SDIN +6 +5 +4 +3 +2 +1 +7 -1 -2 -3 -4 -5 LSB LSB MSB -1 -2 -3 -4 -5 LSB +6 +5 +4 +3 +2 +1 +7 MSB
Left Channel
Right Channel LRCK
SCLK
Figure 13. Right-Justified Data