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Analyzing Critical Paths Chapter 4. Tasks

Figure 4.9: Critical Path Diagram View for Loop

Reconvergent critical paths (which only occur in asynchronous fabrics) are potentially the most complicated

- these have multiple possible graphical representations, selectable by changing options in the Layers section

of the Critical Path Diagram view’s ﬂy-out palette. The ”RC Path Topology” settings alter the arrangement

of the Nodes in the graph. The ”RC Path Arrows” settings alter what the arrows’ direction represents. The

example screenshots below are all of the same reconvergent critical path, with two DFFs both driving the

same two LUT4s.

When the topology is set to Driver→Sink, the nodes are arranged so that user logic Drivers are on the left,

and user logic Sinks are on the right.

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