Channel Config Register
| sound_ch_en | BF unit sound channel enable control bits |
| target_dir | Target direction select for valid voice output |
| audio_gain | Audio sample gain factor |
| data_src_mode | Audio data source configure parameter |
| we_sound_ch_en | Write enable for sound_ch_en parameter |
| we_target_dir | Write enable for target_dir parameter |
| we_audio_gain | Write enable for audio_gain parameter |
| we_data_src_mode | Write enable for data_out_mode parameter |