Each audio data sample is followed by sufficient number of zero
data bits to complete an M-bit word. The CONFIG.SWIDTH register defines the sample width of
the data read and written to memory, as well as the number of SCK
clock cycles per word. The M-bit word is sometimes referred to as
a channel block.
The following figure illustrates a configuration with identical sample and channel/word widths. The
number of SCK pulses matches the number of sample bits.
Figure 10.
Aligned format, with CONFIG.SWIDTH configured to 16 bit samples in a 16 bit word
The next figure illustrates a configuration with greater word width than sample
width. The number of SCK pulses are greater than the number of sample bits, with the sample
being left-aligned in the word.
Figure 11.
Aligned format, with CONFIG.SWIDTH configured to 16-bit samples in a 32-bit word
Alignment of samples
If the word width differs from the sample width, the sample
value can be either right or left-aligned inside a word, as
specified in CONFIG.ALIGN.
When using left-alignment, each word starts with the MSB of
the sample value, as illustrated in the following figure.
Figure 12. CONFIG.ALIGN set to left justified
When using right-alignment, each word ends with the LSB of
the sample value. This is illustrated in the following figure.
Figure 13. CONFIG.ALIGN set to right justified
