ds90ub948 i2s

hi  friend,

now we are debuging ds90ub947 as serialize and ds90ub948 asdeserilize,and we want to output i2s from ds90ub948 ,

on ds90ub947 we connect i2s_clk ,i2s data,i2s_clk,i2s_wc to codec es8323 , but not output on ds90ub948 .

what can i do to modify registers?

thanks!