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SPI DMA问题



请问一下TI的工程师,我slave模式SPI DMA传输设置如下

              SPIWordCountSet(GSPI_BASE,lRetVal);
 
            SetupTransfer(UDMA_CH31_GSPI_TX,UDMA_MODE_BASIC,lRetVal,
                UDMA_SIZE_8,UDMA_ARB_1,
                (void *)g_cBsdTxBufA,UDMA_SRC_INC_8,(void *)(GSPI_BASE + MCSPI_O_TX0),
                UDMA_DST_INC_NONE);

请问一下为什么我spi主机需要多读32个字节才能开始读到正确数据啊