SMT_R2_RXD_COUNT
switch(SMT_R2_RXD_COUNT) {
SMT_R1_RXD_COUNT/(SMT_R1_RXD_COUNT+SMT_R2_RXD_COUNT) ;
SMT_R2_RXD_COUNT/(SMT_R1_RXD_COUNT+SMT_R2_RXD_COUNT) ;
SMT_R1_RXD_COUNT+SMT_R2_RXD_COUNT)