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Serial audio interface (SAI) RM0440

1810/2126 RM0440 Rev 4

counterpart is that the software has to perform some operations to de-interleave the data of

each microphone.

In the other hand, when the slot width is set to 8 bits, each data available into the SAI_ADR

will contain 8 useful bits. This increases the amount of words stored into the memory.

However, it offers the advantage to avoid extra processing since each word contains

information from one microphone.

SAI_ADR data format example

• 32-bit slot width (DS = 0b111 and SLOTSZ = 0). Refer to Figure 618.

For an 8 microphone configuration, two consecutive words read from the SAI_ADR

For a 4 microphones configuration, each word read from the SAI_ADR register

contains a data byte from each microphone.

Figure 618. SAI_ADR format in TDM, 32-bit slot width

• 16-bit slot width (DS = 0b100 and SLOTSZ = 0). Refer to Figure 619.

For an 8 microphone configuration, four consecutive words read from the SAI_ADR

SAI_ADR are right aligned.

For 4 or 2 microphone configuration, the SAI behavior is similar to 8-microphone

configurations. Up to 2 words of 16 bits are required to acquire a byte from 4

microphones and a single word for 2 microphones.

MSv35470V1

M1L-1

M1L-2

M1L-3

M1L-4

M1R-1

M1R-2

M1R-3

M1R-4

M1L-5

M1L-6

M1L-7

M1L-8

M1R-5

M1R-6

M1R-7

M1R-8

M2L-1

M2L-2

M2L-3

M2L-4

M2L-5

M2L-6

M2L-7

M2L-8

M2R-1

M2R-2

M2R-3

M2R-4

M2R-5

M2R-6

M2R-7

M2R-8

b31 b0

M3L-1

M3L-2

M3L-3

M3L-4

M3L-5

M3L-6

M3L-7

M3L-8

M3R-1

M3R-2

M3R-3

M3R-4

M3R-5

M3R-6

M3R-7

M3R-8

M4L-1

M4L-2

M4L-3

M4L-4

M4L-5

M4L-6

M4L-7

M4L-8

M4R-1

M4R-2

M4R-3

M4R-4

M4R-5

M4R-6

M4R-7

M4R-8

LSBFIRST = 0

word 2n

word 2n+1

8 Microphones configuration