Design of RSIC Test Sequence Based on ALFSR Generation Circuit

A design method for random single input change sequence based on ALFSR with primitive multinomial was proposed in this paper. ALFSR can not only generate sequence at any initial state and can be design easily without extra signals but generate RSIC sequence which has the maximal cycle. Code convert circuit was designed according to characters of ALFSR. Code convert circuit was composed of decoder and d flip-flop array. The function of decoder was selection for change bit of the RSIC sequence, and the function of d flip-flop array was iteration for RSIC sequence. The structure of d flip-flop array also makes seed vector setting easily. A module of this design method was implemented and verified with VHDL. The quality of this method was confirmed by these results. In this method, not only the circuit of random sequence is simple, but RSIC sequence has the maxim cycle, so the test rate was hang up.