Title :
The two-phase twisted-ring counter circuit
Abstract :
The behavior of the two-phase twisted-ring counter (2P-TRC) circuit is analyzed. The circuit produces two individual phased clock signals that exercise a phase difference equal to the half period of the clock. A tree-like structure is built by applying the phased outputs of the circuit to the clock inputs of two replicas of the circuit in order to extend its behavior. The EXOR gate is used to define a mirroring structure attached to the 2P-TRC structure such that a primitive/expanded counter configuration is formed. A fundamental concept being described by the transposition mechanism of the EXOR operator is incorporated to the above configuration such that the phase association of interconnecting signals is preserved.
Keywords :
built-in self test; clocks; counting circuits; integrated logic circuits; BIST technique; EXOR gate; EXOR operator transposition mechanism; clock inputs; cooperative ring oscillator; individual phased clock signals; interconnecting signal phase association; mirroring structure; phase difference; phased outputs; primitive/expanded counter configuration; synchronous circuits; tree-like structure; two-phase twisted-ring counter circuit; Automatic testing; Built-in self-test; Circuit testing; Clocks; Counting circuits; Flip-flops; Frequency; Logic testing; Ring oscillators; Very large scale integration;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010593
