Two Methods to Describe New Shift Registers

Shift registers are typical digital logic structures for integrated circuits and are widely used in hardware descriptions. They can be used as early units before memories and be replaced by them later. In multi-precision shift registers, the control signal has heavy loads, and the critical path appears if the input is complex. In this paper, two techniques for synthesis are proposed to reduce either the critical path or power consumption. The first method divides the shift register into 2 or 3 parts, while the second method applies word-based registers to act as the shift register. Both techniques localize the control signals and reduce the path delay.