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手册上确实是说非usb模式(normal mode)的时候, BCLK=MCLK/4 (when SR<88k), 你确认是设置为I2S模式了?不过即使aic23b这样输出也是符合规范的,只不过这个总线位宽很不常用。常用的是16位和32位位宽。