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Clock frequency tracking measuring and error estimating method and module

A technology of tracking measurement and clock frequency, which is applied in the field of embedded automatic testing of integrated circuits, and can solve problems such as unintuitive results and different test accuracy

Inactive Publication Date: 2016-07-06
杭州中科微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the results obtained by this test method are not intuitive, and when the test clock and test time are fixed, the different frequency of the tested clock will lead to different test accuracy

Method used

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  • Clock frequency tracking measuring and error estimating method and module
  • Clock frequency tracking measuring and error estimating method and module
  • Clock frequency tracking measuring and error estimating method and module

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Embodiment Construction

[0034] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the scope of protection of the present invention is not limited to the following the described embodiment.

[0035] Such as figure 1 As shown, the present invention is a clock frequency tracking measurement and error estimation module, comprising:

[0036] A fast clock counter, the counting period can be set according to the needs, and it will automatically start counting after the reset;

[0037] A slow clock counter, the counting period can be set according to the needs, and it will automatically start counting after the reset. Wherein, when the fast clock counter is used as the test clock, the slow clock counter is used as the clock under test. The clock counter ...

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Abstract

The invention discloses a clock frequency tracking measuring and error estimating module which comprises a high speed clock counter which allows a counting cycle to be set as needed and automatically starts counting after resetting is completed, and a low speed clock counter which allows a counting cycle to be set as needed and automatically starts counting after resetting is completed, wherein when the high speed clock counter serves as a test clock, the low speed clock counter serves as a tested clock, and when the low speed clock counter serves as a test clock, the high speed clock counter serves as a tested clock. The module further comprises a deviation counter. When any one of the high speed clock counter and the low speed clock counter finishes counting, the deviation counter starts. The deviation counter after counting outputs result and resets all counters for tracking measurement of the next round.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit embedded automatic testing, in particular to a method and module for implementing clock frequency tracking measurement and error estimation. Background technique [0002] The traditional chip clock measurement method is to output the measured clock through the chip pins, and then connect an external frequency meter and other instruments for measurement. Such a measurement method generally has a large error and takes a long time to measure. Later, in order to overcome this shortcoming, an embedded self-testing scheme was further developed. The embedded scheme generally uses a stable test clock, and within a certain period of time, it is calculated from the count value of the test clock and the clock under test and the frequency of the test clock. The frequency of the clock under test, and then calculate the frequency error. But the result of this test method is not intuitive, and when t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 黄璐何文涛冯华星周美娣殷明
Owner 杭州中科微电子有限公司