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DMI (desktop management interface) bus signal integrity testing method

A test method and bus signal technology, which is applied in the computer field, can solve problems such as increased signal integrity problems, and achieve the effects of improving test efficiency, avoiding repeated operations, and improving accuracy

Active Publication Date: 2014-12-03
LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The rate of DMI2.0 has reached 5GT / s, and the rate of DMI3.0 will reach 8GT / s. As the rate continues to increase, the risk of signal integrity problems also increases

Method used

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  • DMI (desktop management interface) bus signal integrity testing method
  • DMI (desktop management interface) bus signal integrity testing method
  • DMI (desktop management interface) bus signal integrity testing method

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Embodiment Construction

[0021] Below with reference to accompanying drawing, the present invention is further described by specific embodiment:

[0022] A DMI bus signal integrity testing method, adding a CPU XDP interface on the designed board, forming a complete DMI data acquisition loop through this interface; the test software uses Intel EVTS, and the test software and the tested software are realized through USB-XDP3 connection to the platform;

[0023] Constantly adjust the Voltage (voltage) and Timing (timing) through the test software. If the received data is inconsistent with the sent data after the voltage is adjusted to a certain value, it means that the DMI works abnormally under this voltage; the first one that appears The voltage that cannot work normally is the margin of the voltage;

[0024] If the received data is inconsistent with the sent data after the timing is adjusted to a certain value, it indicates that the DMI works abnormally under this timing; the first timing that does n...

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Abstract

The invention discloses a DMI (desktop management interface) bus signal integrity testing method. The DMI bus signal integrity testing method comprises the following steps of arranging a CPUXDP (central processing unit extra device port) interface on a designed board card; forming a whole DMI data acquiring loop by using the interface; using IntelEVTS as testing software; connecting the testing software and a measured platform through USB (universal serial bus)-XDP (extra device port) 3; continuously adjusting voltage and timing sequence by using the testing software; finding out the allowance of the voltage and the allowance of the timing sequence; and judging whether actual DMI signals meet design requirements or not according to requirements on the value of the allowance of the voltage and the value of the allowance of the timing sequence in an Intel standard. The testing method does not depend on an oscilloscope; and testing can be finished by an XDP jig and the testing software. Compared with the testing method which performs testing by using the oscilloscope, the method has the advantages that errors caused by manual operation are greatly reduced, and the testing accuracy is improved. Testing on four data lines can be finished at one step; repeated operation is avoided; and the testing efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of computers, in particular to a DMI bus signal integrity testing method. Background technique [0002] The full name of DMI is Direct Media Interface, which is the direct media interface. It is a bus used by Intel (Intel) to connect the South Bridge and the North Bridge. DMI adopts a point-to-point connection mode, and uses differential signals and special clocks for transmission. Each set of DMI consists of 4 pairs of TX (sending) lines and 4 pairs of RX (receiving) lines. [0003] The rate of DMI2.0 has reached 5GT / s, and the rate of DMI3.0 will reach 8GT / s. As the rate continues to increase, the risk of signal integrity problems also increases. Contents of the invention [0004] The technical problem to be solved by the present invention is: in order to accurately measure these high-speed signals, the present application proposes a simple and effective DMI bus signal integrity testing method. This t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/26
Inventor 贾永涛
Owner LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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