Low-cost arithmetical logic unit based on module and operation code multiplexing

Abstract

The invention discloses a low-cost arithmetical logic unit based on module and operation code multiplexing, which consists of a decoding controller, an adder, a multiplication controller, a division controller, a decimal digit regulator, a logic-arithmetic unit, a bit processor and a data passage selector. The invention has the advantages that through the adoption of the operation code multiplexing and functional module multiplexing method, the system structure of an arithmetic logic unit is optimized, the hardware resource consumption is saved, the chip area is reduced, and the goal of lowering down the chip cost is reached on the premise of ensuring the correct function.

Description

technical field [0001] The invention relates to a microcontroller arithmetic logic unit, specifically, to a low-cost arithmetic logic unit based on module and operation code multiplexing, which reduces hardware resource consumption, saves chip area, and is low-cost. . Background technique [0002] A microcontroller (MCU, Micro Control Unit) is a microcomputer that integrates a central processing unit (CPU), a certain capacity of memory, and a number of input / output ports on a small silicon chip, also known as a single-chip microcomputer. Since the microcontroller came out in the 1970s, it has been widely used in scientific research, production, life and other fields, and has had a great impact on the development of human society. In particular, the MCS-51 series microcontrollers produced by Intel Corporation of the United States quickly occupied industrial measurement and control and automation engineering due to their advantages such as high integration, strong processing ...

AI Technical Summary

Problems solved by technology

[0004] In the existing ALU design, there are the following two disadvantages: each operation of the ALU is encoded separately, resulting in too many operation codes of the ALU, and the complexity of the decoder increases; , multiplication, and division functions are implemented by four separate functional modules: adder, subtracter, multiplier, and divider, resulting in redundant ALU structure and high hardware resource consumption

In short, the existing ALU design often only focuses on the realization of functions, and lacks the consideration of chip area optimization, resulting in high hardware resource consumption of ALU, large chip area, and high implementation cost.

Images