WB_ISR
status = CSR_READ_4(sc, WB_ISR);
CSR_WRITE_4(sc, WB_ISR, status);
CSR_WRITE_4(sc, WB_ISR, 0xFFFFFFFF);
if ((CSR_READ_4(sc, WB_ISR) & WB_ISR_TX_IDLE) &&
(CSR_READ_4(sc, WB_ISR) & WB_ISR_RX_IDLE))
if (CSR_READ_4(sc, WB_ISR) & WB_RXSTATE_SUSPEND)