CHNL_STS_BUF1_ACTIVE
? (status & CHNL_STS_BUF1_ACTIVE ? MXC_ISI_BUF2 : MXC_ISI_BUF1)
: (status & CHNL_STS_BUF1_ACTIVE ? MXC_ISI_BUF1 : MXC_ISI_BUF2);