Cselt-Centro Studi E Laboratori Telecomunicazioni S.p.a.

Renato Manfreddi

Enzo Garetti

Vincenzo Bernardini

A mass memory for use with telecommunication equipment comprises a plurality of memory units associated with respective controllers. Each memory unit includes a command module, dialoguing with the associated controller, and a multiplicity of memory modules for the storage of respective information and redundancy bits of a number of data words, one bit of each word being written in an integrated charge-transfer circuit individually assigned thereto and being continuously recirculated when the memory unit is idle. The command module contains a corrective logic which includes a generator of redundancy bits and intervenes during reading and writing phases. An input/output unit, also forming part of the command module, may comprise a switching circuit including a set of multiplexers which may be selectively operated by instructions from the controller to replace a defective memory module by a spare module whose bit-storing circuits already contain the data of the defective module or can receive them in a reinitialization operation. Instead of a single command module, three such modules synchronized with one another can be used to control the reading and writing through majority logic.

Self-correcting, solid-state-mass-memory organized by bits and with

A stored-program control system for a telephone exchange or the like comprises processing units coupled to several main memories and to several mass memories. Each mass memory includes one or more memory modules each with one or more rows of shift registers of the charge-coupled type, operating in a serial-parallel-serial mode, and a control module equipped with a self-correcting logic and a microprogrammed time base.

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Turin, Italy

Renato Manfreddi