Technique for converting either way between a plurality of N syn

Details Technique for converting either way between a plurality of N syn Technique for converting either way between a plurality of N syn

1989-03-13

1990-05-08

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 581, 370 99, 370109, H04J 307

Patent

active

049244647

ABSTRACT:
The present invention relates techniques for bidirectionally converting between a first format comprising N concurrent serial bit streams and a second format comprising a parallel TDM bit stream of N words using an array of storage elements, each bit stream comprising M-bits per word. In operation, the N words of the input bit stream(s) are sequentially shifted in a predetermined direction into the array of storage elements so that the N words lie parallel to each other along a first axis of the array. During the last clock period of the N words, the data associated with the storage elements not lying on a predetermined diagonal of the array are transposed across the predteremined diagonal so that the N words lie parallel to each other along a second orthogonal axis of the array. The transposed words are then shifted out of the array in the predetermined direction to provide an output for the converted output. Arrangements are provided for cases where N=M, where N does not equal M, and where the input and output clock rates are the same or different.

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