AK7735EQ Datasheet, PDF (54/142 Pages) Asahi Kasei Microsystems – Dual DSP with 4chADC + 4chDAC + 4chSRC

[AK7735]
5-2. Data Definitions
A serial bit stream that is sent or received by the AK7735 is a long sequence composed of “1” and “0”.
This data sequence has hierarchical levels of slot, word and bit.
Bit: It is a smallest component in a serial data stream. The bit duration is one serial clock cycle.
Word: It is a group of multiple bits that composes transmitting data between external devices and the
AK7735. Figure 25 shows an example of a word consists of eight bits.
Slot:
It is composed of a word and adequate additional bits for interfacing to an external device. In
Figure 25, the audio data is an 8-bit valid data and a 12-bit slot needs additional four zeroes to
satisfy an interface protocol of the external device.
If the word length is shorter than the slot length, the data alignment of the word will be the
beginning of the slot (MSB justified) or end of the slot (LSB justified). Figure 25 shows an
example of MSB justified format.
Bit
Word
Slot
Figure 25. Bit, Word and Slot Definitions
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2016/12