45.6.11 DMA Controller Operation

All receiver audio channels and all transmitter audio channels are each assigned to a single DMA Controller channel.

The DMA Controller reads from the I2SMCC_RHR and writes to the I2SMCC_THR for all audio channels successively.

The DMA Controller transfers may use 32-bit word, 16-bit halfword, or 8-bit byte depending on the value of the I2SMCC_MRA.DATALENGTH field.

The DMA chunk size field (DMACHUNK) of the Mode Register B (I2SMCC_MRB) should correspond to the DMA channel configuration. The supported chunk according to the configuration is available in the two tables below

Table 45-6. TX DMA Chunk Configurations
FORMAT TXMONO DATALENGTH NBCHAN I2SMCC_MRB.DMACHUNK Configuration Maximum DMA Chunk Size Allowed
0 or 1

(I2S or LJ)

 0

(Stereo)

 0, 1, 2, 3, 4 or 6

(32, 24, 20, 18, 16 or 8 bits)

 No effect 0 1-word chunk
1 2-word chunk
2 4-word chunk
3 8-word chunk
1

(Mono)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3
0 or 1

(Stereo or Mono)

 5 or 7

(16 bits compact or 8 bits compact)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3
2 or 3

(TDM or TDMLJ)

 No effect No effect 0

(1 channel)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3
0

(Stereo)

 0, 1, 2, 3, 4 or 6

(32, 24, 20, 18, 16 or 8 bits)

 1, 3 or 7

(2, 4 or 8 channels)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3 8-word chunk
2, 4, 5 or 6

(3, 5, 6 or 7 channels)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3
1

(Mono)

 1, 3 or 7

(2, 4 or 8 channels)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3
2, 4, 5 or 6

(3, 5, 6 or 7 channels)

 0 1-word chunk
1 2-word chunk
2
3
0 or 1 5 or 7

(16 bits compact or 8 bits compact)

 1, 3 or 7

(2, 4 or 8 channels)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3
2, 4, 5 or 6

(3, 5, 6 or 7 channels)

 0 1-word chunk
1 2-word chunk
2
3
Table 45-7. RX DMA Chunk Configurations
FORMAT DATALENGTH NBCHAN I2SMCC_MRB.DMACHUNK Configuration Maximum DMA Chunk Size Allowed
0 or 1

(I2S or LJ)

 0, 1, 2, 3, 4 or 6

(32, 24, 20, 18, 16 or 8 bits)

 No effect 0 1-word chunk
1 2-word chunk
2 4-word chunk
3 8-word chunk
5 or 7

(16 bits compact or 8 bits compact)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3
2 or 3

(TDM or TDMLJ)

 No effect 0

(1 channel)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3
0, 1, 2, 3, 4 or 6

(32, 24, 20, 18, 16 or 8 bits)

 1, 3 or 7

(2, 4 or 8 channels)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3 8-word chunk
2, 4, 5 or 6

(3, 5, 6 or 7 channels)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3
5 or 7

(16 bits compact or 8 bits compact)

 1, 3 or 7

(2, 4 or 8 channels)

 0 1-word chunk
1 2-word chunk
2 4-word chunk
3
2, 4, 5 or 6

(3, 5, 6 or 7 channels)

 0 1-word chunk
1 2-word chunk
2
3