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Time-Division Switch Cell Using Associative Memories

IP.com Disclosure Number: IPCOM000046225D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Demange, M: AUTHOR

Abstract

This article describes a Time-Division Switch cell which attaches an inbound serial link and an outbound serial link to an 8-wire unidirectional highway bus, and which is based on the use of associative memories. The serial links and the highway bus operate in time-division multiplex mode; the serial links carry N time slots per frame, while the highway bus carries M time slots, with MON. The cell basically comprises a serializer (SER), a deserializer (DES), and inbound and outbound buffers. Each contains N locations and is associated with an associative memory or content addressable memory (CAM).

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Time-Division Switch Cell Using Associative Memories

This article describes a Time-Division Switch cell which attaches an inbound serial link and an outbound serial link to an 8-wire unidirectional highway bus, and which is based on the use of associative memories. The serial links and the highway bus operate in time-division multiplex mode; the serial links carry N time slots per frame, while the highway bus carries M time slots, with MON. The cell basically comprises a serializer (SER), a deserializer (DES), and inbound and outbound buffers. Each contains N locations and is associated with an associative memory or content addressable memory (CAM).

The deserialized incoming slots are sequentially loaded into the N locations of the inbound buffer. There is a unique correspondence between the position of the slots within each frame and the buffer address. In the same way the N locations of the outbound buffer are sequentially read out on the outbound link time slots. Assuming that incoming time slot l has to communicate with outgoing time slot 30, the control system allocates a time slot circulating on the highway bus, for example, time slot l50, to the communication, and writes number l with a search argument of l50 into the CAM associated with the inbound buffer and number 30 with a search argument of l50 into the CAM associated with the outbound buffer. When time slot l50 on the highway bus is available at the level of the cell, the control bus applies the sear...