Abstract:

States transition in twisted ring counter working progress is analyzed. A new design scheme that the logic function modification is made to excitation function in any counter is put forward, where this scheme does not conflict with the right shift and back cycling shift rules. In present framework design, the only solution needs to be worked out is that the excitation function for the first flipflop. The method is modified while remaining the inside structure of right shift register invariant. It is aimed to explore the logic function modification of selfcorrection in twisted ring counters. The method is to minimize the excitation function with next state Karnaugh map, to check the next state values in invalid state and to carry out selfcorrection synchronously. Design progress of twisted ring counter is simplified.

Key words: twisted ring counter, self-correction, next state karnaugh map, logic function modification, excitation function