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Method for designing signal wire pull-up resistor according to length of signal wire

A signal line and circuit design technology, applied in the field of computer communication, can solve the problems of I2C rise time, rise range, equipment can not work normally, etc., to improve production efficiency, simple and effective process, and improve the quality of wear Effect

Inactive Publication Date: 2013-05-15
LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual I2C test, more problems will be encountered, that is, problems with the rise time of I2C, problems with the rise rate, or problems with the establishment and hold time, which cause the devices on the I2C to not work normally.

Method used

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  • Method for designing signal wire pull-up resistor according to length of signal wire
  • Method for designing signal wire pull-up resistor according to length of signal wire
  • Method for designing signal wire pull-up resistor according to length of signal wire

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Embodiment Construction

[0012] The method of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0013] I2C topology design: BMC can support a maximum of 9 I2C outputs at the I2C outlet. In the I2C protocol, there is a 7-bit addressing mode: the first 7 bits of the first byte form the device address, and the lowest bit (LSB) is the 8th bit, which determines the direction of transmission. The lowest bit of the first byte is "0", which means that BMC will write information to the selected device; "1" means that BMC will read information to the device. When an address is sent, each device in the system is in After the start condition, compare the first 7 bits with its own address. If they are the same, the device will determine that it is addressed by the BMC. As for whether it is a device receiver or a device transmitter, it is determined by the R / W bit. Therefore, the device address cannot be repeated in an I2C design topology. According t...

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Abstract

The invention provides a method for designing a signal wire pull-up resistor according to the length of a signal wire. In the design of detail circuits of 12Cs and in the layout design, firstly ensuring capacity of wires adopted in the design circuit, due to the fact that design topologies are different, the layout design lengths of the 12Cs are different, so that in actual design computation, the width of the wires of the 12Cs maintain 10miles, the capacity of the wires is computed according to the capacity of 3.3pf / inch. After the actual layout design is finished, a distance calculator of the layout is used for specific measurement of the lengths of the wires of the 12Cs. According to the design requirements, a specific pull-up resistor matched with the 12Cs is designed at an output end of a block multiplexer channel (BMC). Through modification, measurement values of the 12Cs can meet product requirements in subsequent tests.

Description

technical field [0001] The invention relates to the field of computer communication, in particular to a method for designing a pull-up resistor on a signal line according to the length of the signal line. Background technique [0002] In the design of I2C, there is relatively little information about the previous board type and peripheral devices, and the board type structure is simple. For the topology of I2C, it is more of a single-end to single-end design, and no single I2C to many In the case of a road I2C device. At the same time, there are more and more external devices for each board. With the increase of devices, there are more and more requirements for I2C management on the motherboard, and more I2C are required to support multiple devices. [0003] In our design, I2C is used as the output signal of BMC, which can realize functions such as reading device information, modifying device online registers, and sharing device information through I2C. The quality of the ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张锋
Owner LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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