I2S_XFER
val = HREAD4(sc, I2S_XFER);
HWRITE4(sc, I2S_XFER, val);
val = HREAD4(sc, I2S_XFER);
HWRITE4(sc, I2S_XFER, val);
val = HREAD4(sc, I2S_XFER);
HWRITE4(sc, I2S_XFER, val);