Improved Design of I2S IP with Sidetone Signal Processing Capability (I2S_SC) for ASICs

With the development of integrated circuit technology, there are more and more researches on System-on-chip (SOC). In general, many interface modules need to be integrated into SOC chip to implement specific functions, among which audio interface module is one of the most widely used IP. Audio technology is an important part of multimedia technology. In the digital audio transmission technology, many transmission protocol standards have been proposed. I2S(Inter-IC Sound) is one of the most popular protocols because of its simple structure, good stability and wide application range. However, the IP of the standard I2S protocol interface itself does not have any data processing function. In this paper, an I2S_SC(I2S_sidetone controller) is implemented, which has the function of signal processing. Compared with the standard I2S protocol interface IP, the I2S _ SC implemented in this paper has the unique sidetone echo function and loopback mechanism, which can support the actual call scenario. At the same time, it combines the functions of half-duplex transmission mode and full-duplex transmission mode, and can transmit data with high efficiency. In addition, it uses the TDM(Time Division Multiplexed) function to reduce the chip design area, and through the internal power saving mechanism to reduce power consumption. Finally, In order to facilitate the use of I2S _ SC In AMBA systems, this IP provides an APB bus slave interface, which supports two external DP-Rams as FIFO (first-in-first-out).