Cirrus Logic CS42518 - Manual (Page 28)

28 DS584F2
CS42518
4.6.2 Serial Audio Interface Formats
The CODEC_SP and SAI_SP digital audio serial ports support five formats with varying bit depths from
16 to 24 as shown in
Figures 10 to 14 . These formats are selected using the configuration bits in the reg-
isters, “Functional Mode (address 03h)” on page 47 and “Interface Formats (address 04h)” on page 49 .
For the diagrams below, Single-Speed Mode is equivalent to Fs = 32, 44.1, 48 kHz; Double-Speed Mode
is for Fs = 64, 88.2, 96 kHz; and Quad-Speed Mode is for Fs = 176.4, 196 kHz.
Left Channel Right Channel
CX_SDINx
CX_SDOUT
SAI_SDOUT
+3 +2 +1 +5 +4 -1 -2 -3 -4 -5 +3 +2 +1 +5 +4 -1 -2 -3 -4 MSB MSB LSB LSB
CX_LRCK
SAI_LRCK
CX_SCLK
SAI_SCLK
Figure 10. I²S Serial Audio Formats
I²S Mode, Data Valid on Rising Edge of SCLK
Bits/Sample
SCLK Rate(s)
Notes
Master Slave
16
64 48, 64, 128 Fs Single-Speed Mode
64 Fs 64 Fs Double-Speed Mode
64 Fs 64 Fs Quad-Speed Mode
18 to 24
64, 128, 256 Fs 48, 64, 128 Fs Single-Speed Mode
64 Fs 48, 64 Fs Double-Speed Mode
64 Fs 48, 64 Fs Quad-Speed Mode