sound/soc/clocking.rst

2 Audio Clocking
5 This text describes the audio clocking terms in ASoC and digital audio in
6 general. Note: Audio clocking can be complex!
10 ------------
12 Every audio subsystem is driven by a master clock (sometimes referred to as MCLK
13 or SYSCLK). This audio master clock can be derived from a number of sources
15 audio playback and capture sample rates.
23 ----------
24 The Digital Audio Interface is usually driven by a Bit Clock (often referred to
25 as BCLK). This clock is used to drive the digital audio data across the link
28 The DAI also has a frame clock to signal the start of each audio frame. This
32 Bit Clock can be generated as follows:-
34 - BCLK = MCLK / x, or
35 - BCLK = LRC * x, or
36 - BCLK = LRC * Channels * Word Size
43 audio clocks as it usually gives more accurate sample rates than the CPU.