User`s guide

Clock Recovery Configuration Dialog Box - If your SIA-3000
has the Clock Recovery (CR) option, it will need to be
configured for the specific data rate that you wish to measure.
The configuration is a global setting and may be accessed
from the Edit menu under "CR Configuration". Or, from
within the tools that may utilize the CR, you can access the
same global configuration setup (See figure to the right).
The CR data rate that is set is displayed in the bottom status
bar.
The "Voltage Correction" check box will compensate for the
hard line SMA jumpers that are installed between CR Out and
CH1 In. Therefore, with the box checked, the oscilloscope
will display the correct voltages when the jumpers are in
place.
The "Corner Frequency" displays the corner frequency of the
clock recovery PLL transfer function. Currently, the only
setting is Default. Adjustability will be available in a future
software release.
The "Application" radio button selection optimizes the
performance of the Multi-rate CR based on the type of pattern
under test. Settings for the 8B/10B encoded patterns or other
patterns (including PRBS) are included.
Close command (Tool menu) - Use this command to close all views containing the active tool. If you close a tool
without saving, you lose all changes made since the last time you saved it.
Comma Detect - Select either On or Off. Comma detect On allows the SERDES to align the incoming data precisely on
half-word boundaries.
Context Sensitive Help - Clicking on the button (
) activates context sensitive help. Once activated, the cursor
changes to the Help Topics icon and will remain so until another click of the pointing device occurs. Upon clicking
the second time, help text will be displayed.
Convergence - Determines the percentage within which consecutive tail-fits must comply in order to insure reasonable
frequency coverage from the corner frequency. The default setting is 10%. See TailFit. This setting is only active
when “Tailfits” is set to Auto.
Copy command (Edit menu) - Use this command to copy the current active view onto the clipboard. This
command is unavailable if there is no data currently selected. Copying data to the clipboard replaces
the contents previously stored there.
Corner Frequency - The Corner Frequency is the Frequency of the Half Power Point (or -3dB Point), so the choice of
this frequency will determine the low frequencies visible on the FFT. The Corner Frequency is used to determine
the maximum measurement interval to be used in sampling and is entered in kHz. A low corner frequency extends
the time required to acquire the measurement set because histograms over many more periods must be acquired.
Below the corner frequency, a natural roll-off of approximately 20dB per decade is observed. The default value is
637kHz, a Fibre Channel standard, except for the High Frequency Modulation Tool that is 100kHz. Corner
frequency affects how much data is acquired and, therefore, the choice of this value also affects the test time. See
the Theory section for High Frequency Modulation.
Course Delay - Displays the coarse delay setting in multiples of 800ps for Gigabit Ethernet and 941ps for Fibre Channel.
Course Delay Bypass - Select either On or Off. Selecting On will bypass the coarse delay options. In Edge Count
Mode, the coarse delay bypass is automatically placed On.
Course Delay Index - Select the number of coarse delays 0-39.
© WAVECREST Corporation 2005 Glossary
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