ISD94100 Series Technical Reference Manual
Sep 9, 2019
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In 6-channel TDM PCM data format, the bit-width of audio data in a channel block can be 16, 24,
or 32 bits. The memory arrangements of audio data for various settings are shown Figure 6.17-19.
In 16-bit audio data transmission, ORDER (I2S_CTL0[7]) can be used to swap the audio data of
even and odd channels which are stored in transmitting and receiving FIFO. In 24-bit audio data
transmission, ORDER (I2S_CTL0[7]) can be also used to select the left-alignment or right-
alignment formula of audio data which is stored in 32-bit FIFO entries.
The FIFO content of 8-channel TDM PCM data format is similar to 6-channel and it can be
analogized easily.
N
N+1
CH1
CH0
0
15
0
15
0
15
0
15
Mono 16-bit data mode
Stereo 16-bit data mode, ORDER (I2S_CTL0[7]) = 0
N
0
Mono 24-bit data mode, ORDER (I2S_CTL0[7]) = 0
23
CH0
CH1
0
15
0
15
Stereo 16-bit data mode, ORDER (I2S_CTL0[7]) = 1
N
0
Mono 24-bit data mode, ORDER (I2S_CTL0[7]) = 1
23
CH3
CH2
0
15
0
15
CH2
CH3
0
15
0
15
Redundant bits
Redundant bits
CH5
CH4
0
15
0
15
CH4
CH5
0
15
0
15
Figure 6.17-19 FIFO Contents for Various 6-channel Audio Modes (Part-1)
