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2.3.1. Recommended Initial SDC Constraints
2.3.2. SDC File Precedence
2.3.3. Iterative Constraint Modification
2.3.4. Creating Clocks and Clock Constraints
2.3.5. Creating I/O Constraints
2.3.6. Creating Delay and Skew Constraints
2.3.7. Creating Timing Exceptions
2.3.8. Example Circuit and SDC File
2.3.7.5.1. Default Multicycle Analysis
2.3.7.5.2. End Multicycle Setup = 2 and End Multicycle Hold = 0
2.3.7.5.3. End Multicycle Setup = 2 and End Multicycle Hold = 1
2.3.7.5.4. Same Frequency Clocks with Destination Clock Offset
2.3.7.5.5. Destination Clock Frequency is a Multiple of the Source Clock Frequency
2.3.7.5.6. Destination Clock Frequency is a Multiple of the Source Clock Frequency with an Offset
2.3.7.5.7. Source Clock Frequency is a Multiple of the Destination Clock Frequency
2.3.7.5.8. Source Clock Frequency is a Multiple of the Destination Clock Frequency with an Offset
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2.4.2.3. Query of Collections
You can display the contents of a collection with the query_collection command. Use the -report_format option to return the contents in a format of one element per line. The -list_format option returns the contents in a Tcl list.
query_collection -report_format -all $regs_union
Use the get_collection_size command to return the number of items the collection contains. If your collection is in a variable with the name col, use set num_items [get_collection_size $col] rather than set num_items [llength [query_collection -list_format $col]] for more efficiency.