CONTROL MEMORY USING RECIRCULATING SHIFT REGISTERS

摘要

A memory matrix for storing control words for controlling a common control time division multiplexed (TDM) switch is formed by employing a plurality to shift registers connected in recirculating configuration. Synchronization to control word time slots in the memory matrix to system timing is realized by storing a timing marker which is advanced in identical manner as the control word time slots. If synchronization between the system timing and control word time slots is interrupted, it is restored by controllably inhibiting advancing of the control word time slots and the stored timing marker.