成本最低且变化最小，则来源于系统脚本，底盘格式，现场布线，逻辑控制和文件的持有。
Costs are reduced and changes are minimized because the system footprint, chassis format, field wiring, control logic, and documentation are retained.
基于LUT的逻辑单元有相当简单的布线需求，对于逻辑实现是最为有效的。
LUT-based logic cell has very simple routing demands, which is efficient for logic implementation.
首先介绍了常用并行加法器的设计方法，并在此基础上采用带进位强度的跳跃进位算法，通过逻辑综合和布局布线设计出了一个加法器。
On the basis we design an adder by the adoption of carry skip algorithm with carry strength signals and implement, through logic synthesis and layout.
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