Method for providing digital audio frequency I2S interface clock

[0015] At present, SPDIF and I are often used in the field of digital TV audio output and digital audio data exchange 2 S interface, where I 2 The S interface is an audio data transmission bus standard between digital audio equipment developed by Philips, such as figure 1 As shown, this bus has 4 physical wires: one SD to transmit serial data, one SCK to provide bit clock for data, one WS to provide clock for switching left and right channel data frames, and one for system to improve Synchronous clock to MCLK. Due to the independent clock signal, the bus transfer rate is fast, and the main clock provided by it provides receiving timing for the receiving chip, so the entire transmission system uses a single clock, so the time difference is extremely small. Both the serial data transmission clock SCK and the left and right channel selection clock WS are provided by the system clock MCLK. In order to generate the MCLK clock, the current common practice in the industry is as follow