DC_INTRS
CSR_WRITE_4(sc, DC_IMR, DC_INTRS);
if ( (CSR_READ_4(sc, DC_ISR) & DC_INTRS) == 0)
if (CSR_READ_4(sc, DC_ISR) & DC_INTRS)
while(((status = CSR_READ_4(sc, DC_ISR)) & DC_INTRS) &&
CSR_WRITE_4(sc, DC_IMR, DC_INTRS);
CSR_WRITE_4(sc, DC_IMR, DC_INTRS);