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Browse Prior Art Database

HYBRID EMULATION SCHEME FOR MICROCONTROLLER UNITS

IP.com Disclosure Number: IPCOM000006311D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2001-Dec-24
Document File: 1 page(s) / 68K

Publishing Venue

Motorola

Related People

Bob Smith: AUTHOR [+2]

Abstract

This idea relates to a technique of supplying cus- tomers of new microcontrollers with plug-in simulation without recourse to the design on EPROM version or the investment in expensive "piggy-back" developments.

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MOTOROLA INC. Technical Developments Volume 14 December 1991

HYBRID EMULATION SCHEME FOR MICROCONTROLLER UNITS

by Bob Smith and Frank Ormerod

   This idea relates to a technique of supplying cus- tomers of new microcontrollers with plug-in simulation without recourse to the design on EPROM version or the investment in expensive "piggy-back" developments.

  It is always desirable to supply customers of microcontrollers with devices which emulate the opcra- tion of the ROM based part, which fit exactly the same socket in the application and which can have program code loaded in the field.

  Typically, this requires the parallel development of an EPROM version of the microcontroller involving mask costs, engineering and test costs. At the current rate of microcontroller development this would also add to the versions and devices to be handled by manufac- turing and product engineering. Many of the EPROM devices are only required in development laboratories or for demonstrations with consequentially low volumes.

  The hybrid emulation scheme overcomes these problems. It is a technique which uses the actual ROM version of the microcontroller (4) and combines it with a specially designed EPROM chip (6) onto a ceramic hybrid assembly (2), as shown for example in Figure 1. The EPROM chip, once designed, covers a whole fam- ily of microcontrollers and contains enough EPROM
(8) to store the program code, boat ROM (10) to lead the code, address and data interfaces to the microcon- t...