Agilent Technologies 16760A manual Branches, Edges, Next Ranges on, 246

Chapter 6: Concepts

Understanding Logic Analyzer Triggering

Branches

Branches are similar to the Switch statement in the C programming language and the Select Case statement in Basic. They provide a method for testing multiple conditions. Each branch has its own actions. An example of multiple branches is shown below:

1. If ADDR

< 1000

then Go To 2

<- This is a branch of Level 1

Else

If

ADDR

> 2000

then

Go

To 3

<-

This

is

a

2nd

branch

of

Level 1

Else

If

DATA

=

2000

then

Trigger

<-

This

is

a

3rd

branch

of

Level 1

2.If DATA <= 7000 then Trigger

3.If there is a Rising Edge on SIG1, then Trigger

In sequence level 1, there are three branches, so there are three possible actions that can be taken.

When the condition of one branch is met, none of the branches below it are tested. In other words, there is no way for more than one branch to be executed based upon a single sample, even if the sample causes the conditions for more than one branch to be met. In other words, each branch is an “Else If”.

Next: “Edges” on page 246

Edges

Edges represent a transition from low to high or high to low on a single signal. Typically, edges are specified as “rising edge”, “falling edge”, or “either edge”, where “rising edge” indicates a transition from a low to a high. On most logic analyzers, up to two edges can be included in the trigger sequence although some allow only one.

Next: “Ranges” on page 246

Ranges

Ranges are a convenient method for specifying a range of values, such as “ADDR in range 1000 to 2000”. Most logic analyzers also support a

246