DS90UB949-Q1: SPI and I2S do not work at the same time

Hi 

We are using UB949 and UB948. 
I want to use SPI and I2S at the same time (UB949 is master)

For SPI configuration, 
Writing 0x06 to HSCC_CTRL of UB948 and doing SPI communication is good (SCK = 2MHz)

But for I2S communication,
Putting 0x02 in DATA_PATH_CTRL of UB949 makes SPI communication abnormal

E.g,
1. Data previously sent to 0x1C1 is sent to 0x1C0
2. 0x001 Data is sent with 0x000
(We are using 9bit SPI)


If you put 0x00 in DATA_PATH_CTRL of UB949, SPI will work again.

What settings did we missing?

Thanks