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A serial bus control method and device

A serial bus and control method technology, applied in the computer field, can solve the problems of occupying PCB area, high chip cost, increase PCB overhead, etc., and achieve the effect of reducing material cost and realizing low cost

Active Publication Date: 2018-11-09
RUIJIE NETWORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the implementation of the I2C bus, the cost of the PCA9548 chip is relatively high, and the two signals of the I2C bus must be switched through the chip, and the PCB (printed circuit board) has many traces, which occupies the PCB area and increases the cost of the PCB.

Method used

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  • A serial bus control method and device
  • A serial bus control method and device

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Embodiment Construction

[0033] In order to facilitate the understanding of the embodiments of the present invention, several specific embodiments will be taken as examples for further explanation below in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation to the embodiments of the present invention.

[0034] The serial bus pin interface mostly adopts an open-drain (OD gate) circuit structure, and the open-drain output is connected with an external pull-up resistor to output a high level. Output low level, if you want to output high level, you don’t need to drive the chip, you only need to rely on an external pull-up resistor; while the OD gate used in the serial bus pin interface relies on an external pull-up resistor to achieve high level output.

[0035] figure 2 The realization flowchart of the serial bus control method that the embodiment of the present invention provides, as figure 2 As shown, the executive body of the serial bus control method c...

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Abstract

Embodiments of the present invention provide a serial bus control method and apparatus. The method comprises: detecting a master device interface and a slave device interface of data to be transmitted; when it is detected that the master device interface is at a low level, turning on a master-slave transmission switch and transmitting, to the slave device, a low level signal sent from the master device; when it is detected that the master device interface is at a high level, turning off the master-slave transmission switch and enabling the slave device interface to output a high level signal through an external first pull-up resistor; when it is detected that the slave device interface is at a low level, turning on a slave-master transmission switch and transmitting, to the master device, a low level signal sent from the slave device; and when it is detected that the slave device interface is at a high level, turning off the slave-master transmission switch and enabling the master device interface to output a high level signal through an external second pull-up resistor. According to the embodiments of the invention, the serial bus control method and apparatus provided by the invention can control multi-channel transmission of the serial bus with low cost.

Description

technical field [0001] The invention relates to the technical field of computers, in particular to a serial bus control method and device. Background technique [0002] Bus (BUS) refers to a group of transmission lines that transmit information from one or more source components to one or more destination components by time-division multiplexing. According to the way of transmitting data, it can be divided into serial bus and parallel bus. In a serial bus, binary data is sent to the destination device bit by bit through a data line; in a parallel bus, there are usually more than 2 data lines. [0003] The serial bus can be an internal integrated circuit (Inter Integrated-circuit Bus, I2C) bus, a serial management interface (Serial Management Interface, SMI) bus, etc. The working principle of the SMI bus and the I2C bus is similar. The following uses the I2C bus as an example. illustrate. [0004] The I2C bus is a simple bidirectional two-wire serial bus developed by Phili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/38G06F13/42
CPCG06F13/385G06F13/4282
Inventor 林聚承
Owner RUIJIE NETWORKS CO LTD
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