The authors formulated a general method for constructing time slot permuters from spatial permutation networks. Using the method, they constructed a new time slot permuter, the Lambda time-slot permuter. The Lambda time slot permuter is obtained from the bit-controlled, self-routing permutation network, the Lambda network. While the Lambda time slot permuter requires more hardware than the time slot permuter based on the Benes network described by S.V. Ramanan et al. (1990), its control is very simple. In the Lambda time slot permuter, a single bit from the destination tag in the first of a pair of time slots entering an exchange element is used as the control bit so that the switch setting can be done before the second time slot arrives; thus, it is possible that the switch setting does not incur any delay. The Lambda time slot permuter is suitable for a class of applications where on-the-fly control of the time slot permuter is important, and is especially efficient for a pipelined operation.
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