Data external storage expansion interface

Abstract

The invention discloses a data external storage expansion interface, which is characterized in that a data line of an MCU is connected with an input end of an I / O expansion chip; the address line is connected with the input end of the first decoder, the output end of the decoder and the control line of the MCU are connected with the input end of the AND gate, the output end of the AND gate is connected with the delay input end, and the delay output end is connected with the input end of the adder and the control line of the memory; the output end of the first decoder is connected with the input end of the NOT gate, and the output end of the NOT gate is connected with the reset end of the adder; the output end of the adder is connected with a second decoder, the output end of the decoder isconnected with a chip selection line of the I / O extension chip, the output ends of the first to (N-1) th I / O extension chips are connected with an address line of the memory, and the output end of the Nth I / O extension chip is connected with a data line of the memory; and a control line of the MCU is connected with a control line of the I / O expansion chip. According to the invention, the addressline limitation of the MCU and the capacity limitation of the traditional data storage expansion method are broken through, and the real-time access requirement of super-large capacity is met.

Description

technical field [0001] The invention relates to the technical field of storage, in particular to a data external storage expansion interface. Background technique [0002] With the increasing popularity of computer network communication, the construction of computer data storage capacity is becoming more and more important. However, the number of address pins of the Micro Control Unit (MCU) limits the access capacity of the memory, and the use of external memory involves complex protocols and drivers. Therefore, how to further expand the memory of the MCU to meet the super-large storage requirement has become an urgent problem to be solved in the field of storage technology. [0003] The existing MCU storage expansion methods are roughly divided into two types: one is to expand the access capacity through the P1 and P3 pins of the microcontroller, but this method is limited by the number of P1 and P3 ports, and the expansion capacity is very limited , For example, the comm...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a data external storage expansion interface to solve the problem that the existing MCU storage expansion method realizes expansion through the P1 and P3 pins of the single-chip microcomputer or through serial conversion and parallel chip, resulting in very limited expansion capacity or poor real-time performance, and expansion Difficulty and cost

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