对全局控制信号设置多周期路径的方法

Method of Building Multi-cycle Path for Global Control Signal

在数字集成电路(Integrated Circuit,IC)设计中,一些流水运行、分级计算的电路,使用全局控制信号(Global Control Signal,GCS)来进行设计是易于实现的一种方法。对于时序紧张的全局控制信号,通过在逻辑设计阶段,降低全局控制信号控制优先级;在逻辑综合阶段,加入多周期路径设置的指令,可以将全局控制信号设置为具有多周期路径特性的信号,能够有效地改善时序,降低后期物理设计的布线难度,从而达到设计目的。

In digital integrated circuit design, using global control signal （GCS） is an easy way to be carry out for the circuits with pipeline and hierarchical computation. In order to lower jitter of global control signal, control priority of GCS is decreased during logical design period and multi-cycle path setting statement is added in synthesis to set GCS as multi-cycle path signal. This method can optimize the timing of paths and decrease routing difficulty.