CGXX_SMUX_CBFC_CTL_RX_EN
cfg |= (CGXX_SMUX_CBFC_CTL_RX_EN |
cfg &= ~(CGXX_SMUX_CBFC_CTL_RX_EN |
*rx_pause = !!(cfg & CGXX_SMUX_CBFC_CTL_RX_EN);