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Logic analyzer

A logic analyzer and analyzer technology, applied in the field of logic analyzers, can solve problems such as increased control overhead

Active Publication Date: 2015-12-16
ARM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem that arises is that as the number of trigger states increases, the control overhead associated with providing the flexibility to move between different combinations of trigger states required to perform logic analysis operations increases significantly

Method used

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Embodiment Construction

[0022] figure 1 An integrated circuit 2 is schematically shown comprising hardware circuitry 4 expected to carry out analysis / modulation / testing operations. A logic analyzer 6 is coupled to the hardware circuit 4 and performs analysis operations on the hardware circuit 4 . Integrated circuit 2 also includes other modulation and analysis circuits (for example, tracking circuit 8 and scanning unit circuit 10).

[0023] figure 2 A more detailed logic analyzer 6 is schematically shown. The logic analyzer 6 includes a state controller that includes figure 2 circuit 12 within the dashed line shown in . figure 2 The remainder of the circuit outside the dotted line in is used as the analyzer circuit.

[0024] The state controller 12 is used to switch the logic analyzer among a plurality of trigger states forming a programmable trigger state sequence, and generate an index signal Trig_state[N:0], where N is the number of expandable trigger states. The value of the index signal...

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Abstract

A logic analyzer is provided with a state controller 12 and analyzer circuitry. The logic analyzer switches between a programmable sequence of trigger states and generates an index signal within each trigger state. The index signal is used to control the analyzer circuitry to select appropriate portions of programmable trigger state data so as to configure the matching operation performed against hardware signal values taken from hardware circuitry 4 which is subject to analysis by the logic analyzer 6. Target control signal data may be used to control target signal values according to the index value of the trigger state. A plurality of logic analyzer may be provided on one integrated circuit.

Description

technical field [0001] The invention relates to the field of logic analyzers. More particularly, the present invention relates to logic analyzers that switch between a plurality of trigger states forming a sequence of trigger states. Background technique [0002] It is known to provide logic analyzers that switch between a plurality of trigger states, each trigger state corresponding to a state in which one or more hardware signals of a hardware circuit under test are correlated with predetermined A predetermined value of a condition / status is matched. The problem that arises is that as the number of trigger states increases, the control overhead associated with providing the ability to flexibly move between different combinations of trigger states required to perform logic analysis operations increases significantly. Logic analyzers are often provided for the purpose of debugging hardware circuits, so a high degree of flexibility in the trigger states they support and the...

Claims

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Application Information

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IPC IPC(8): G01R31/3177
CPCG01R31/3177G06F11/25
Inventor 马克·杰拉尔德·拉文
Owner ARM LTD