TCAM Memory Cell Layout Using GAA Transistors for Lower Search Power
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Solution Overview
Problem
Content addressable memories (CAMs), particularly TCAMs, face challenges in achieving fast search performance while minimizing dynamic power expenditure due to their parallel operation nature, which is critical for applications requiring extremely fast database searches.
Innovation Solution
The implementation of a TCAM cell design utilizing nanostructure transistors, such as nanosheet transistors or gate-all-around (GAA) transistors, with independent bit-line pairs and word lines, along with a match cell configuration that reduces power consumption and enhances search performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional CAM parallel search operation is used, then search speed is improved, but dynamic power consumption increases
Solution Approach 1:
The CAM is divided into multiple banks, with each bank containing independent search cells. This segmentation allows parallel search operations across banks while enabling independent power management, so that not all banks need to operate at full power simultaneously, thereby reducing overall dynamic power consumption while maintaining fast search performance.
Solution Approach 2:
The patent implements dynamic power management by allowing different banks to be activated or deactivated based on search requirements. The power consumption is dynamically adjusted by controlling which search cells are active during each search operation, enabling the system to maintain fast search speed when needed while reducing power expenditure during operations that don't require full parallel capacity.
2Productivity
If geometric size is decreased to increase functional density, then IC evolution is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent transitions from planar 2D transistor layouts to three-dimensional vertically-stacked transistor structures. This dimensional change allows significantly higher functional density within the same footprint area, as multiple transistor layers are stacked vertically. The manufacturing complexity is managed through specialized fabrication processes that are becoming standardized in the industry, enabling high-density integration without proportionally increasing manufacturing difficulty.
Data Source
AI summary
Memory cells are provided. A memory cell includes a first data storage cell, a second data storage cell and a match cell. The first data storage cell includes a first pull-down transistor, a first pull-up transistor and a first pass-gate transistor. The second data storage cell includes a second pull-down transistor, a second pull-up transistor, and a second pass-gate transistor. The match cell includes a first data transistor and a second data transistor. The first data transistor is electrically connected to the first pull-down transistor, the first pull-up transistor and the first pass-gate transistor. The second data transistor is electrically connected to the second pull-down transistor, the second pull-up transistor and the second pass-gate transistor. The first and second data storage cells and the match cell have the same cell height. The match cell is disposed between the first and second data storage cells.