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PCM1774 的SCKI 是否必须外接 ?
System Clock Input， 系统时钟是必须要的，好像没有看得芯片内建时钟，如果确实没有，那就只能靠外接了
系统的主时钟，必须外接，时钟频率范围为3.072MHz~18.432MHz，在这个范围内即可。
