Chapter 6: Concepts

Understanding Logic Analyzer Triggering

Special box

Trigger point

---------------------

------------------------------

Next: “Summary of Triggering Capabilities” on page 242

Summary of Triggering Capabilities

Because logic analyzer triggering provides a great deal of functionality, the following table provides a brief summary of the capabilities covered in this article. Each of these capabilities will be described.

Summary of Logic Analyzer

Triggering

Capabilities

Capability

Examples

 

=====================

===============================================

Edges

If there is rising edge on SIG1 then Trigger

 

If there is falling edge on SIG1 then Trigger

---------------------

-----------------------------------------------

Boolean expressions

If ADDR = 1000 and DATA = 2000

---------------------

-----------------------------------------------

Ranges

If ADDR in

range 1000 to 2000

---------------------

-----------------------------------------------

Storage qualification

1. If..

 

 

Else If

ADDR in range 1000 to 2000 then

 

Store

Sample

 

Go to

1

 

Else If

ADDR not in range 1000 to 2000 then

 

Don't

Store Sample

 

Go to

1

---------------------

-----------------------------------------------

Counters

1. If DATA

= 1000 Then

 

Increment Counter 1

 

Go to

2

 

2. If Counter 1 > 2 Then

 

Trigger

---------------------

-----------------------------------------------

Timers

1. If DATA

= 1000 Then

 

Start

Timer 1

 

Go to

2

 

2. If Timer 1 > 500 ns Then

 

Trigger

---------------------

-----------------------------------------------

Next: “Sequence Levels” on page 242

Sequence Levels

While logic analyzer triggers are often simple, they can require complex programming. For example, you may want to trigger on the rising edge of one signal that is followed by the rising edge of another signal. This means that the logic analyzer must first find the first rising

242

Page 242
Image 242
Agilent Technologies 16760A manual Summary of Triggering Capabilities, Next Sequence Levels on, 242