DC_TXSTART
CSR_WRITE_4(sc, DC_TXSTART, 0xFFFFFFFF);
CSR_WRITE_4(sc, DC_TXSTART, 0xFFFFFFFF);
CSR_WRITE_4(sc, DC_TXSTART, 0xFFFFFFFF);
CSR_WRITE_4(sc, DC_TXSTART, 0xFFFFFFFF);
CSR_WRITE_4(sc, DC_TXSTART, 0xFFFFFFFF);
CSR_WRITE_4(sc, DC_TXSTART, 0xFFFFFFFF);