I have a K10P144M120 design. I have a I2S MIC connected to I2S1_RXD0, I2S1_BCLK and I2S1_RX_FS. Can I configure the SAI module for receive only? Do I have to configure the transmit? It appears that the RX BCLK source is from the transmit BCLK. Can I configure the transmit but do not configure the I/O pins?