Multi-Height Semi-Dynamic Flip-Flop Layout for Lower Wiring Load
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Solution Overview
Problem
Existing semiconductor integrated circuits face inefficiencies in design and increased power consumption due to complex node arrangements and insufficient metal wiring space, leading to higher capacitance loads and decreased operation speed.
Innovation Solution
Implementing a semi-dynamic flip-flop as a multi-height standard cell with an efficient arrangement of nodes and using clock gate lines to connect power rails, reducing unnecessary metal wirings and improving design efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex node arrangements are used in standard cells, then more functions can be integrated, but metal wiring space becomes insufficient and capacitance load increases
Solution Approach 1:
The patent transitions from traditional two-dimensional standard cell layouts to a three-dimensional multi-height structure. By utilizing vertical space with multiple power rail heights (first through fourth power rails at different elevations), the design accommodates complex node arrangements without increasing the horizontal footprint, thereby preserving metal wiring space while integrating more functions.
Solution Approach 2:
The standard cell is segmented into multiple height regions with distinct power rails at different levels. This segmentation allows independent routing and wiring in each height layer, distributing the wiring load across multiple dimensions and preventing any single layer from becoming congested with excessive capacitance.
2Adaptability or versatility
If complex node arrangements are used in standard cells, then more functions can be integrated, but operation speed decreases due to higher capacitance loads
Solution Approach 1:
By moving to three-dimensional multi-height architecture, the patent reduces the horizontal distance between connected nodes while maintaining functional integration. This vertical arrangement shortens signal paths and reduces capacitive loading, thereby improving operation speed despite increased functional complexity.
3Ease of manufacture
If traditional single-height standard cells are used, then design and routing are simpler, but node arrangement efficiency is insufficient
Solution Approach 1:
The patent introduces vertical dimensionality with multiple power rail heights to improve node arrangement efficiency. While this increases structural complexity, it enables more efficient packing and routing of nodes within the same footprint, ultimately improving overall design efficiency through better space utilization.
4Reliability
If unnecessary metal wirings are present, then connectivity is ensured, but power consumption increases and design efficiency decreases
Solution Approach 1:
The patent extracts and removes unnecessary metal wirings from the traditional layout by utilizing vertical routing paths in the multi-height structure. Clock gate lines and power rails are routed through multiple height regions, eliminating redundant horizontal connections and reducing overall wiring length, thereby decreasing power consumption while maintaining essential connectivity.
Data Source
AI summary
A semi-dynamic flip-flop includes a semiconductor substrate, first through fourth power rails, and at least one clock gate line. The first through fourth power rails are disposed on the semiconductor substrate, extend in a first direction, and are arranged sequentially in a second direction substantially perpendicular to the first direction. The at least one clock gate line is disposed on the semiconductor substrate, and extends in the second direction to pass through at least two regions among a first region between the first power rail and the second power rail, a second region between the second power rail and the third power rail, and a third region between the third power rail and the fourth power rail. The at least one clock gate line receives an input clock signal.