Backside lookup table-based processor

Abstract

The invention provides a backside lookup table (BS-LUT)-based processor for calculating a mathematical function. The processor comprises a lookup table circuit (LUT) and an arithmetic logic circuit (ALC). The LUT is located on the backside of a processor substrate, and data stored by the LUT is correlated to the mathematical function. The ALC is located on the front of the processor substrate, and performs arithmetic operation on relevant data of the function. The LUT is electrically coupled with the ALC by multiple through silicon vias (TSV).

Description

technical field [0001] This invention relates to the field of integrated circuits, and more specifically to processors. Background technique [0002] Traditional processors use logic-based computation (LBC for short), which is mainly calculated through logic circuits (such as NAND gates, etc.). Logic circuits are suitable for implementing arithmetic operations (such as addition, subtraction, and multiplication), but they are powerless for non-arithmetic functions (such as elementary functions, special functions, etc.). The high-speed and efficient implementation of non-arithmetic functions faces great challenges. [0003] In traditional processors, only a small number of basic non-arithmetic functions (such as basic algebraic functions and basic transcendental functions) can be directly implemented by hardware, and these functions are called built-in functions (built-in functions). Built-in functions are typically implemented through a combination of arithmetic operations ...

AI Technical Summary

Problems solved by technology

Simultaneous formation of high-performance memory transistors and logic transistors on the same surface of an OOS on the same substrate is a challenge for the fabrication process

[0006] Two-dimensional integration will also limit the further development of computational density and computational complexity

Due to the two-dimensional integration, the existence of LUT 200X will increase the chip area of ​​traditional processor 00X and reduce its calculation density, which is not good for parallel computing

At the same time, in the design process of the traditional processor 00X, since the ALU100X is the core component of the traditional processor 00X and occupies most of the chip area, the chip area that can be used by the LUT 200X is limited.

Therefore, legacy processor 00X only supports a small number of built-in functions

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