User's Manual

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Chapter 2: Probing and Selecting the Sampling Mode
Choosing the Sampling Mode
turn it on again by selecting the Setup button in the System window or by
dragging the analyzer's instrument tool icon to the workspace in the
Workspace window.
Selecting the Eye Scan Mode
In eye scan mode, the logic analyzer becomes a tool for validating and
characterizing the data valid windows of signals latched by a clock. The
Eye Scan display shows eye diagrams for each channel, like an
oscilloscope, but with less accuracy and resolution. The Eye Scan
display can help you quickly identify setup/hold or other signal
integrity anomalies which can then be examined in greater detail with a
high-speed or high-bandwidth oscilloscope.
• “To select the eye scan mode” on page 55
• “To select the eye scan mode speed configuration” on page 55
• “To set up the eye scan mode reference clock” on page 56
See Also “Setting Up and Running Eye Scan Measurements” on page 119
“Displaying Captured Eye Scan Data” on page 133
“Saving and Loading Captured Eye Scan Data” on page 152
“Understanding Eye Scan Measurements” on page 259
To select the eye scan mode
1. Open the logic analyzer Setup window.
2. Select the Sampling tab.
3. Choose the Eye Scan Mode option.
To select the eye scan mode speed configuration
1. In the Sampling tab, with Eye Scan Mode selected, select one of the eye
scan mode speed configurations.
The selected configuration specifies the speed that the input reference
clock may be as fast as. For example, in the 800 Mb/s / Eye Scan