MATLAB DESIGN HDL CODER RELEASE NOTES User's Guide Page 394

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394 www.xilinx.com System Generator for DSP User Guide
UG640 (v 12.2) July 23, 2010
Chapter 5: System Generator Compilation Types
Histogram Detail
The slider bar allows you to adjust the width of the bins in the histogram. This allows you
to get more detail about the paths if desired. The display below shows the results of a
different design with a larger number of bins than the diagram above:
This diagram shows the paths grouped into three regions, with each forming a rough bell
curve distribution. These groups are probably from different portions of the circuit or from
different timing constraints that are from different clock regions. If you wish to analyze the
paths from a single timing constraint, you may select a single constraint for viewing from
the Timing constraint pulldown menu at the top of the display.
Note the bins and portions thereof shown in red. These are the paths that have negative
slack; i.e., they do not meet the timing constraint. In this example you can see that some
paths have failed but not by a large margin so it seems reasonable that with some work this
design could be reworked to meet timing.
Statistics
Clicking on the Statistics icon displays several design statistics, including the number of
constraints, paths analyzed, and maximum frequency of the design.
Trace Report
Clicking on the Trace icon shows the raw text report from the Trace program. This file gives
considerable detail about the paths analyzed. Each path analyzed contains information
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