Cirrus Logic CS8420 - Manual (Page 20)

20 DS245F4
CS8420
Figure 17. Serial Audio Input Example Formats
MSB LSB MSB LSB MSB
ILRCK
ISCLK
SDIN
Channel A Channel B
Left
Justified
(In)
ILRCK
ISCLK
MSB LSB MSB LSB
Channel A
SDIN MSB
Channel B
I²S
(In)
ILRCK
ISCLK
Channel A Channel B
MSB SDIN MSB LSB LSB
Right
Justified
(In)
X = don’t care to match format, but does need to be set to the desired setting
+ I²S can accept an arbitrary number of bits, determined by the number of ISCLK cycles
* not 11 - See Serial Input Port Data Format Register Bit Descriptions for an explanation of the meaning of each bit
SIMS SISF SIRES1/0 SIJUST SIDEL SISPOL SILRPOL
Left-Justified X X 00 0 0 0 0
I²S X X 00+ 0 1 0 1
Right-Justified X X XX* 1 0 0 0