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Bus device and data transmission method thereof

A data transmission method and a bus device technology, which are applied in the field of bus devices and data transmission, can solve the problems of high cost and increased circuit cost, and achieve the effect of low cost and reduced circuit cost

Inactive Publication Date: 2008-10-29
BEIJING XINWANG RUIJIE NETWORK TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the use of a dedicated I 2 C extension chip, while the I 2 The cost of the C extension chip is higher, which in turn leads to an increase in the cost of the circuit

Method used

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  • Bus device and data transmission method thereof
  • Bus device and data transmission method thereof
  • Bus device and data transmission method thereof

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Embodiment Construction

[0023] In the embodiment of the present invention, the output control of the logic device is carried out by the CPU, so that the addresses of a plurality of chips connected to the CPU are validly set, so that the addresses of the chips that the CPU needs to access control are valid, and the addresses of the chips through the I 2 The addresses of other chips connected to the C bus are invalid. In the case of reducing the circuit cost, the CPU passes the I 2 The number of chips for C-bus access control is expanded.

[0024] like image 3 Shown is a schematic structural diagram of an embodiment of the bus device of the present invention. The bus device of this embodiment comprises the I that connects CPU and chip 2 C bus 101, and the logic device 102 that is used for input-output conversion, CPU is connected with logic device 102 through local bus 103, and control logic device 102 is to CPU through I 2The addresses of one or more chips connected to the C bus 101 are validly se...

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Abstract

The invention discloses a bus device and a data transmission method; wherein, the bus device comprises an I<2>C bus used for connecting a CPU and a chip and a logic device used for carrying out the conversion of input and output; the CPU is connected with the logic device by a local bus; the logic device is controlled to effectively set the address of the chip which is connected with the CPU, so as to lead the CPU to access and control the chip with the effective address. The method comprises that the CPU controls the output of the logic device by the local bus and leads the logic device to carry out the effective setting of the address of the chip which is connected with the CPU; the CPU carries out the access and control to the chip which has effective address and is connected with the CPU by the I<2>C bus. The device and the method of the invention can extend the quantity of the chip which can be controlled by the CPU by I<2>C bus with low cost.

Description

technical field [0001] The invention relates to bus technology, in particular to a bus device and a data transmission method thereof. Background technique [0002] Between integrated circuits (Inter-Integrated Circuit, hereinafter referred to as: I 2 C) The bus is a two-wire serial bus developed by PHILIPS, which is used to connect a central processing unit (Center Process Unit, hereinafter referred to as: CPU) and its peripheral devices. [0003] I 2 The C bus is a serial bus composed of a data line (Serial Date Line, hereinafter referred to as SDA) and a clock line (Serial Clock Line, hereinafter referred to as SCL), and can send and receive data. Two-way transmission is carried out between the CPU and the controlled integrated circuit (Integrated Circuit, hereinafter referred to as: IC) (also known as: chip), and between IC and IC, with a maximum transmission rate of 100kbps. Various controlled circuits are connected in parallel on this bus. But just like a telephone,...

Claims

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Application Information

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IPC IPC(8): G06F13/36G06F13/38
Inventor 杨宁
Owner BEIJING XINWANG RUIJIE NETWORK TECH CO LTD
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