Browse Prior Art Database

Basic Storage Module Selection Check

IP.com Disclosure Number: IPCOM000083957D
Original Publication Date: 1975-Aug-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Annunziata, EJ: AUTHOR [+3]

Abstract

The figure shows a memory system consisting of BSM's (Basic Storage Modules) 0 to 63. A command (CMD) is issued to a particular BSM by transmitting that command over a transfer bus connected to that BSM (and possibly other BSM's), and activating the particular BSM by a "Command Select" signal applied to that BSM only.

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Basic Storage Module Selection Check

The figure shows a memory system consisting of BSM's (Basic Storage Modules) 0 to 63. A command (CMD) is issued to a particular BSM by transmitting that command over a transfer bus connected to that BSM (and possibly other BSM's), and activating the particular BSM by a "Command Select" signal applied to that BSM only.

Usually, the "Command Select" signal is generated by decoding the BSM identification part of the memory address (Included in the command). But in many systems that contain a number of BSM's, the reconfiguration and service requirements generate a need to rename BSM's so that contiguous addressing may be maintained in case of a failure in one unit, or in a preventative maintenance situation when a BSM must be varied offline for maintenance. This need to reconfigure may be done in a number of different ways such as switches, pluggable decoder cards, cable changes, etc.

A particular way this feature could be implemented is via an associative array or a table look-up mechanism. Where the BSM identification is not a straightforward decode of the high-order portion of the address, as is the case in some associative look-up schemes, it is very desirable that setup errors or circuit malfunctions be detected immediately upon occurrence. The circuit described easily accomplishes this objective.

A description of the circuit follows: to check that a command transmitted on line 6 reaches the intended BSM, the appropriate BSM...