Function multiplexing minimizes pin count requirements

Proceedings of 3rd International Workshop on the Economics of Design, Test and Manufacturing Pub Date : 1900-01-01 DOI:10.1109/ICEDTM.1994.496092

O. Yishay

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Abstract

The Motorola Modular Family (MMF) is currently composed of two major groups of products; the MC68HC16 family, based on the CPU16 core, and the MC68HC300 family, based on the CPU32 core. Each product in the MMF contains a CPU module, a system integration module, which controls internal to external bus cycles, and one or more of the other modules available in this family. A new system integration module has been designed to utilize reduced pin count packages for decreased cost. A multiplexed test mode allows microcontroller's internal signals to be driven or to be tested even when the pin, previously used to carry the data, is not implemented. This test mode allows the minimum pin set to provide the same controllability and observability as was present during the original test pattern development, and thus provides the same fault coverage. The internal bus protocol must be met, and internal timing must be identical to the one used before. The cost to develop the high fault grade test patterns was very high, and the time to write the patterns was very long-up to several years

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功能复用最小化引脚计数要求

摩托罗拉模块化系列(MMF)目前由两大类产品组成;基于CPU16核心的MC68HC16系列和基于CPU32核心的MC68HC300系列。mmf中的每个产品都包含一个CPU模块，一个系统集成模块，用于控制内部到外部总线周期，以及该系列中可用的一个或多个其他模块。设计了一种新的系统集成模块，利用减少引脚数的封装来降低成本。多路复用测试模式允许微控制器的内部信号被驱动或被测试，即使以前用于携带数据的引脚没有实现。该测试模式允许最小引脚集提供与原始测试模式开发期间相同的可控性和可观察性，从而提供相同的故障覆盖。必须满足内部总线协议，并且内部定时必须与之前使用的相同。开发高故障等级测试模式的成本非常高，编写模式的时间也非常长——可能长达数年

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Proceedings of 3rd International Workshop on the Economics of Design, Test and Manufacturing

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