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Programming Embedded Systems in C and C++This is a fixed, one-time cost, so it might be that money is no object (usually for high-volume products) or that this is the only accurate measure of system cost (in the case of a small number of units produced). Number of units The tradeoff between production cost and development cost is affected most by the number of units expected to be produced and sold. For example, it is usually undesirable to develop your own custom hardware components for a low-volume product. Expected lifetime How long must the system continue to function (on average)? A month, a year, or a decade? This affects all sorts of design decisions from the selection of hardware components to how much the system may cost to develop and produce. Reliability How reliable must the final product be? If it is a children's toy, it doesn't always have to work right, but if it's a part of a space shuttle or a car, it had sure better do what it is supposed to each and every time. In addition to these general requirements, there are the detailed functional requirements of the system itself ...» |
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