FH_TCSR_LOWER_BOUND
(FH_TCSR_LOWER_BOUND + 0x20 * (_chnl))
(FH_TCSR_LOWER_BOUND + 0x20 * (_chnl) + 0x4)
(FH_TCSR_LOWER_BOUND + 0x20 * (_chnl) + 0x8)