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超大规模集成电路特征尺寸逐步缩小的发展过程中,芯片面积是制约芯片成本的最重要因素之一,也是直接影响半导体产品市场竞争力的最重要因素之一。本文介绍了将所有可测性设计(DFT)的输入输出端口(IO)与各种类型的正常功能工作模式的IO复用的方法,从而达到减少IO并最终减小芯片面积的目的。介绍了输入信号和输出信号分别在单向端口IO和双向端口IO中复用的方法。然后,以一款经过0.18μm逻辑工艺流片验证的flash存储器控制芯片为例,对比了采用IO复用方法前后芯片的利用率和面积,证明了方案的可行性和有效性。
In the development process of the feature size of the VLSI gradually shrinking, the area of the chip is one of the most important factors that restrict the cost of the chip, and it is also one of the most important factors that directly affect the market competitiveness of semiconductor products. This article describes the IO multiplexing of all I / O ports (IOs) with various types of normal functional modes of operation to achieve the goal of reducing IO and eventually reducing the chip area. Describes the method of multiplexing input and output signals in one-way port IO and bidirectional port IO respectively. Then, taking a flash memory control chip verified by 0.18μm logic process flow as an example, the utilization and area of the chip before and after using IO multiplexing method are compared, which proves the feasibility and effectiveness of the scheme.