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在TRM手册22.3.3.1.2 Inter-Integrated Sound (I2S) Format章节有说明。
I2S format is specifically designed to transfer a stereo channel (left and right) over a single data pin AXRn. "Slots" are also commonly referred to as "channels". The frame width duration in the I2S format is the same as the slot size. The frame signal is also referred to as "word select" in the I2S format. www.ti.com/.../spruh73p.pdf
