CS42528 datasheet(29/91 Pages) CIRRUS

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DS586F1

CS42528

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 48 and “Interface Formats (address 04h)” on page 50.

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

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

48, 64, 128 Fs

Single-Speed Mode

64 Fs

Double-Speed Mode

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

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