A_TP_PARA_REG5
t3_set_reg_field(sc, A_TP_PARA_REG5, 0, F_RXDDPOFFINIT);
r = t4_read_reg(sc, A_TP_PARA_REG5);
t4_set_reg_field(sc, A_TP_PARA_REG5, m, v);