ISR_ALL
CSR_WRITE_4(sc, I2C_ISR, ISR_ALL);
while ((isr = (NIC_GET_2(sc, REG_ISR) & ISR_ALL)) != 0) {
NIC_PUT(sc, SNR_ISR, ISR_ALL);
NIC_PUT(sc, SNR_ISR, ISR_ALL);
while ((isr = (NIC_GET(sc, SNR_ISR) & ISR_ALL)) != 0) {
EMAC_WRITE(sc, EMAC_ISR, ISR_ALL);