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Enhancement of General Purpose Digital Computers: Method and Apparatus for Distribution of Control Data to High-Speed Processing Equipment

IP.com Disclosure Number: IPCOM000051385D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 50K

Publishing Venue

IBM

Related People

Cardenia, PA: AUTHOR [+3]

Abstract

Small general-purpose computers used for process control generally lack the high burst mode I/O data rate capability required by these data intensive processes. Additionally, there are usually multiple subsystems (applications) demanding data simultaneously.

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Enhancement of General Purpose Digital Computers: Method and Apparatus for Distribution of Control Data to High-Speed Processing Equipment

Small general-purpose computers used for process control generally lack the high burst mode I/O data rate capability required by these data intensive processes. Additionally, there are usually multiple subsystems (applications) demanding data simultaneously.

The use of a stand-alone, multiport, shared memory (storage buffer) in combination with a low-cost small processor is a unique and cost-effective solution for many process control applications. Sufficient intelligence is included with the buffer to reduce the role of the processor from direct involvement in each word transferred to that of maintaining the buffer interface. This relieves the processor of the bulk of the bookkeeping responsibilities during repeated transfers of large blocks of data.

The speed of the storage buffer hardware may be chosen appropriately for each subsystem. This allows the most cost-effective data storage for a system whose subsystems demand different data rates.

An application benefiting from the above-described features of the stand- alone buffer are represented by the E-beam lithography system shown in the figure. The processor involvement with the application subsystem is typically reduced many orders of magnitude. Output data rates are greater than available at processor ports, and real-time gathering of input data is possible on a relatively slow processor.

The buffers, placed in close proximity to individual subsystems, do not suffer from lengthy transit times ass...