ChipScope Pro Software and Cores User Guide
113
UG029 (v14.3) October 16, 2012
ChipScope Pro Analyzer Features
•
Click the Set Parameters to Current Values button to set the parameters to their
current values on the
MGT/BERT Settings
panel.
The order of the parameters in the
Sweep Parameter
table dictates how the parameters are
swept. The values of the parameters near the top of the table are swept less frequently than
the parameters near the bottom of the table. In other words, the parameters near the top of
the table are in the outer loops of the sweep algorithm while the parameters near the
bottom of the table are in the inner loops of the sweep algorithm.
Each parameter must be set up with a start and end value. The order of the parameter
values cannot be changed. After you select the start value, the end values available for
selection change automatically to include only valid selections. If you do not want to
sweep through a parameter, set the start and end values for that parameter to the same
value. The
Sweep Value Count
column indicates how many values are swept through for
a particular parameter. After all sweep parameters have valid start and end values, the
total number of sweep iterations is shown in the
Total Iterations
field.
Scan Settings
The Virtex-7 GTH transceivers include a circuit called RX Eye Scan that performs a
comparison between the received data at two different locations in the sample region:
•
At the optimal sampling location, called “Data Sample”.
•
At sampling location offset in the horizontal and/or vertical direction, called “Offset
Sample”.
If the bit value sampled at the “Data Sample” location and the “Offset Sample” location
match, then this is not considered an error. However, if the two bit values do not match,
then this is considered an error bit causing the bit error ratio (BER) to increase.
The GTH RX Margin Analysis feature supports two different scan algorithms:
•
2D Full Scan:
Scans all horizontal and vertical offset sampling points within the
“eye”. This mode is useful for creating a statistical eye map used to analyze the entire
two-dimensional received eye margin.
•
1D Bathtub:
Scans all horizontal sampling points through the 0 vertical row offset.
This mode is useful for performing quick analysis of received phase margin.
The horizontal and vertical offsets can be controlled independently. Each offset can be
controlled to have an interval and range. The
Range
combo box controls the maximum and
minimum offset values of the scan. The
Interval
combo box controls how many rows or
columns are skipped between each row or column that is scanned.
Test Controls
After setting up the sweep test, start the test by clicking the
Start
button. The sweep
parameter table is disabled and the test starts running.
As the sweep test runs, the current sweep result file, current iteration, elapsed time, and
estimated time remaining status indicators are displayed. The sweep results are shown in
the
Sweep Test Log
text area near the bottom of the screen. You can pause the sweep test
by clicking the
Pause
button or stop the sweep test completely by clicking the Stop & Reset
button.
The results from a sweep test are displayed in the
Test Results
panel and are also sent to a
sweep test result file. Clicking on the
Log File Settings
button brings up the dialog
window. You can set both the location of the file and the number of sweep iterations stored
in each file. If the total number of sweep iterations exceeds the file limit, multiple files with
