OFDM_COR_CTL
nxt6000_writereg(state, OFDM_COR_CTL, (0x01 << 5) | (nxt6000_readreg(state, OFDM_COR_CTL) & 0x0F));
val = nxt6000_readreg(state, OFDM_COR_CTL);
nxt6000_writereg(state, OFDM_COR_CTL, val & ~COREACT);
nxt6000_writereg(state, OFDM_COR_CTL, val | COREACT);