Control memory using recirculating shift registers.

摘要

A memory matrix (102) for storing control words for controlling a common control time division multiplexed (TDM) switch (101) is formed by employing a plurality of shift registers (201-1 through 201-M) connected in recirculating configuration. Synchronization of control word time slots in the memory matrix to system timing is realized by storing a timing marker (in 210) which is advanced (via SCK) 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 (via 204, 206, 207, 208, 209) advancing of the control word time slots and the stored timing marker.