SPI connecting asymmetic interface device

Abstract

The invention is a SPI-connecting unsymmetrical interfacing device, relating to the circuit interfacing technical field, comprising five-pin I / O interface, signal generating logic circuit, I / O state switch and three-pin input added interface, where in input state, it uses eight pins, where two pins controls SI pin connection of SPI, and five pins of SPI of input device but SI pin are connected through I / O interface with pins of SPI of integrated circuit, respectively; in output state, it uses SCK' and CS' pins to generate serial input signals to transmit to the SI pin of the SPI of the integrated circuit, and five pins of the SPI of the integrated circuit but the SI pin are connected with pins of SPI of output device through O / I interface, respectively. And the invention is suitable to use unsymmetrical products in input and output devices, having beneficial effects of high transmission rate, low cost, use convenience and small structure.

Description

technical field [0001] The present invention relates to circuit interface technology, in particular to a technology of an asymmetrical interface device connected to a serial peripheral interface SPI (serial peripheral interface). Background technique [0002] When a terminal (such as a mobile phone, card reader, etc.) needs to update the data (including programs) in the machine's memory, the factory can first store the upgraded data in the electronic disk of the built-in memory in advance, and then store the updated data in the electronic disk. The disk is delivered to the terminal user. Since the upgrade interface of the terminal is in one-to-one correspondence with the pins of the electronic disk interface, the user only needs to insert the electronic disk into the upgrade interface of the terminal to perform the upgrade operation. The upgrade data is read from the memory of the terminal and transferred to the memory of the terminal, thereby completing the update of the da...

AI Technical Summary

Problems solved by technology

Disadvantages: Both the terminal and the electronic disk need to add a special chip for the universal serial (USB) interface, which is costly;

Disadvantages: There are many pins (6 pins are required), and the universal serial (USB) plug cannot be used, which does not conform to the user's usage habits

[0008] To sum up, none of the three technical solutions can simultaneously take into account the low cost of the electronic disk interface, high transmission speed and the use of USB plug hardware type, and the demand for compact structure

Images