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TLV320AIC3254EVM-K: 评估板独立供电,然后通过pure path下载成功后,将USB线拔下来,音频信号消失问题

Part Number: TLV320AIC3254EVM-K

 使用这条路给评估板供电,然后通过PPS软件下载完成后,是有声音的,但是我将usb拔下来后,声音就没有了。我想问一下,难道pps写进开发板的寄存器值,在没断电的情况下也不会被保存嘛?