datapath system control register
| RX_PDU_LEN_IN | pdu length user programmed header+payload unit is bit. |
| AA_SEL | access address selection |
| PDU_LEN_SEL | pdu length selection |
| H_IDX | h index from 0.25 to 0.75 default is 0.5. |
| RX_EN_SEL | rx enable select signal |
| TX_EN_SEL | tx enable select signal |
| RX_REQ | rx request. |
| TX_REQ | tx request. |
| RX_MODE | rx mode |
| ANT_DATA_START | ant mode data start signal need write 0 first then to 1. |
| DET_MODE | detection mode 0low ppwer mode 1high performance mode. |