SL_EARLY_TX
SLN_WRITE_4(sc, SL_CFG1, SL_EARLY_RX | SL_EARLY_TX | SL_RXBUF_64 | SL_RXFIFO_1024BYTES);
SLN_WRITE_4(sc, SL_CFG1, SL_EARLY_TX | SL_RXBUF_64);