Browse Prior Art Database

Single Module Personal Computer

IP.com Disclosure Number: IPCOM000099405D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Fitzgerald, RL: AUTHOR [+6]

Abstract

A technique is described whereby a personal computer's logical functions are combined in a single module with multiple chips. The multi-chip module eliminates the need of having separately mounted modules representing individual functions and then interconnected and wired onto a circuit board. The multi-chip module retains all of the required operational characteristics, while improving reliability and serviceability.

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This is the abbreviated version, containing approximately 52% of the total text.

Single Module Personal Computer

       A technique is described whereby a personal computer's
logical functions are combined in a single module with multiple
chips.  The multi-chip module eliminates the need of having
separately mounted modules representing individual functions and then
interconnected and wired onto a circuit board.  The multi-chip module
retains all of the required operational characteristics, while
improving reliability and serviceability.

      The single module, as shown, consists of nine functional
elements:  cache controller 1, microprocessor 2, floating point
processor 3, fast static random access memory (RAM) 4 (for the cache
memory), direct memory access (DMA) for accessing the dynamic RAM
(DRAM) 5, thirty-two bit buffer 6 for addressing the MICRO CHANNEL*
bus, error correction 7 for the data path to the DRAM, memory address
drivers 8 for the address path to the DRAM, and bus control unit 9.

      By combining all nine functions into a single multi-chip
module, care is exercised to ensure that all critical paths exist on
the module. The module enables data to be entered from the DRAM,
and/or feature bus, so that once it is in the module it would be
processed in the best packaged environment.  In other words, the
local bus would not drive off of the module and, therefore, would not
see any module pin capacitance, or other possible parasitics.

      Unlike normal critical machine paths experienced in the prior
art, the impedances that critical paths would see in the single
module wou...