Content Addressable Memory Physical Layer for Semiconductor Heat Management
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Solution Overview
Problem
Semiconductor memory devices face issues with heat generation due to increased bandwidth between logic and memory chips, leading to inefficiencies in data input/output operations.
Innovation Solution
A memory device incorporating a content addressable memory (CAM) system that stores data patterns, reducing the number of external data pads required, thereby minimizing heat generation by using a smaller external bandwidth compared to internal data paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the bandwidth between logic chip and memory chip is increased to improve data input/output speed, then reading and writing speed is improved, but heat generation increases
Solution Approach 1:
The data input/output operation is segmented into two phases: a data phase for transmitting data bits and an address phase for transmitting address information. This segmentation allows the system to reduce the bandwidth requirement during the data phase by using previously established address information, thereby reducing heat generation while maintaining overall data input/output speed through efficient phase transition.
Solution Approach 2:
The address information is transmitted and established in advance during the address phase before the actual data transmission occurs. This preliminary action allows the data phase to proceed with reduced bandwidth requirements, as the addressing overhead is already completed, thus reducing heat generation during the data input/output operation.
2Temperature
If the number of external data pads is reduced to minimize heat generation, then heat generation is reduced, but the complexity of data routing increases
Solution Approach 1:
The external data pads are made multi-functional by using them for both data transmission and address information transmission at different phases. This universality allows the system to reduce the total number of external data pads required, minimizing heat generation while the internal routing logic handles the phase-dependent signal routing to manage complexity.
Solution Approach 2:
The data pads dynamically switch between data mode and address mode based on the operational phase. This dynamic behavior allows the same physical pads to serve multiple purposes, reducing the total pad count and heat generation, while the dynamic routing logic manages the complexity of signal distribution internally.
Data Source
AI summary
There is provided a memory device including a content addressable memory physical layer connected to external data pads. During the write operation, the content addressable memory physical layer transmits a selected data pattern from among data patterns stored in a content addressable memory cell array as input data to selected memory cells of a memory cell array corresponding to an address received from external device based on first data received from the external data pads. During the read operation, the content addressable memory physical layer compares output data read from the memory cell array with the data patterns based on an address received from external device, and outputs content addressable memory address corresponding to data pattern matched by a result of the comparing as second data through the external data pads.