Intel® Quartus® Prime Pro Edition User Guide: Debug Tools

ID 683819
Date 10/02/2023

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Document Table of Contents Conditional Mode

In Conditional mode, the Signal Tap logic analyzer determines whether to store a sample by evaluating a combinational function of predefined signals within the node list. The Signal Tap logic analyzer writes into the buffer during the clock cycles in which the condition you specify evaluates TRUE.

You can select either Basic AND, Basic OR, Comparison, or Advanced storage qualifier conditions. A Basic AND or Basic OR condition matches each signal to one of the following:

  • Don’t Care
  • Low
  • High
  • Falling Edge
  • Rising Edge
  • Either Edge

If you specify a Basic AND storage qualifier condition for more than one signal, the Signal Tap logic analyzer evaluates the logical AND of the conditions.

You can specify any other combinational or relational operators with the enabled signal set for storage qualification through advanced storage conditions.

You can define storage qualification conditions similar to the manner in which you define trigger conditions.

Figure 67. Conditional Storage Qualifier SetupThe figure details the conditional storage qualifier setup in the .stp file.
Figure 68. Comparing Continuous and Conditional Capture Mode in Data Acquisition of a Recurring Data Pattern

The data pattern is the same in both cases.

  • Continuous sampling capture mode:
  • Conditional sampling capture mode: