CS4349
4.3
Digital Interface Format
The device will accept audio samples in 1 of 8 digital interface formats, as shown in
for
Stand-Alone Mode and
for Control Port Mode.
The desired serial audio interface format is selected via the DIF[2:0] bits in Control Port Mode (see
or the DIF[2:0] pins in Stand-Alone Mode (see
For illustrations of the required
relationship between LRCK, SCLK and SDIN, see
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.
LRCK
Left Channel
Right Channel
SCLK
SDIN
MSB
-1
-2
-3
-4
-5
+5
+4
+3
+2
+1
LSB
MSB
-1
-2
-3
-4
+5
+4
+3
+2
+1
LSB
Figure 11. Left-Justified up to 24-Bit Data
LRCK
Left Channel
Right Channel
SCLK
SDIN
MSB
-1
-2
-3
-4
-5
+5
+4
+3
+2
+1
LSB
MSB
-1
-2
-3
-4
+5
+4
+3
+2
+1
LSB
Figure 12. I²S, up to 24-Bit Data
LRCK
Left Channel
Right Channel
SCLK
SDIN
LSB
MSB
-1
-2
-3
-4
-5
+7
+6
+5
+4
+3
+2
+1 LSB
MSB
-1
-2
-3
-4
-5
+7
+6
+5
+4
+3
+2
+1 LSB
Figure 13. Right-Justified Data
DS782F1
19
CIRRUS [ CIRRUS LOGIC ]
