TTL-communication-bus slave-module expanded circuit

A technology for expanding circuits and communication buses, applied in the field of bus communication

Pending Publication Date: 2017-10-03
上海景格信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a TTL communication bus sub-module expansion

Method used

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  • TTL-communication-bus slave-module expanded circuit
  • TTL-communication-bus slave-module expanded circuit
  • TTL-communication-bus slave-module expanded circuit

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Embodiment Construction

[0022] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that the technical solutions claimed in this application can be realized even without these technical details and various changes and modifications based on the following implementation modes.

[0023] In the application documents of this application, some concept explanations and examples:

[0024] TTL means that it is mainly composed of BJT (Bipolar Junction Transistor, bipolar junction transistor), transistor and resistor, and has the characteristics of fast speed.

[0025] The first TTL bus refers to a line connecting the sending pin of the main module and the receiving pins of multiple sub-modules.

[0026] The second TTL bus refers to a line connecting the receiving pin of the main module and the sending pins of multiple sub-modules.

[0027] Tri-state buffer, also known as tri-state g...

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Abstract

The invention relates to the field of bus communication, and discloses a TTL-communication-bus slave-module expanded circuit. The TTL-communication-bus slave-module expanded circuit includes TTL buses, tristate buffers, a main module and multiple slave modules, wherein the main module includes transmitting base pins and receiving base pins and is usedfor transmitting request signals and receiving feedback signals, and the multiple slave modules include transmitting base pins and receiving base pins and are used for receiving request signals and transmitting feedback signals. The transmitting base pins of the main module and the receiving base pins of all the slave modules are connected to a first TTL bus, and the receiving base pins of the main module and the transmitting base pins of all the slave modules are connected to a second TTL bus; tristate buffers are arranged between the transmitting base pins of the main module and the first TTL bus, tristate buffers are arranged between the transmitting base pins of all the slave module and the second TTL bus, andthroughthe signal enhancement effect and output enabling function of the tristate buffers, the extension of the slave modules on the communication buses is achieved.

Description

technical field [0001] The invention relates to the field of bus communication, in particular to the expansion technology of TTL bus communication sub-modules. Background technique [0002] The traditional communication bus has TTL standard, RS-232 standard, 485 standard, etc., but due to the hardware circuit and its own transmission signal, there are very strict restrictions on the number of sub-modules mounted on the bus. For example, the 485 standard has the most theoretical Only 256 modules can be mounted, but actually due to various unavoidable circuit problems, various problems will occur when more than 100 modules are mounted, and the speed needs to be reduced. [0003] The TTL bus connection method is: the TX of the main module is connected to the RX of the sub-module on the same bus, and the RX of the main module and the TX of the sub-module are connected to the same bus. The existing problems are: when the main module sends a signal through TX, the RX of each sub-...

Claims

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Application Information

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IPC IPC(8): G06F13/40
CPCG06F13/4022G06F13/4086G06F2213/0002
Inventor 王云
Owner 上海景格信息科技有限公司
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