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TMS320C5517 I2S是如何将16bit 数转换成32bit的(no packed,no sign extension)?

如题,在使用I2S时,数据来源是AIC3204,这边的设置是16bit长度,在DSp这边,使用16bit长度接收,波形看着正常(1Kz正弦波输入),是正弦波,但是当我将接收长度改为32bit时(no packed,no sign extension),画出来依旧是正弦波。这数据是如何扩展的,让精度提高了一倍?