The firing squad synchronization problem on cellular automata has been studied extensively for more than forty years, and a rich variety of synchronization algorithms have been proposed so far. In the present paper, we propose a new optimum-time algorithm for synchronizing two-dimensional cellular automata. The algorithm can synchronize any two-dimensional rectangle array of size m ×n in optimum m + n + max(m, n)- 3 steps. A partial implementation of the algorithm for small cellular arrays is also given.
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