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Chapter 6: XST Design Constraints Constraint Name Command Line Command Value Hierarchy Separator -hierarchy_separator _ / default: / Input Format -ifmt mixed vhdl verilog default: mixed Input/Project File Name -ifn file_name default: N/A Add I/O Buffers yes -iobuf no default: yes Ignore User Constraints yes -iuc no default: no Library Search Order -lso file_name.lso default: N/A LUT Combining auto -lc area off default: off Netlist Hierarchy -netlist_hierarchy as_optimized rebuilt default: as_optimized Output File Format ngc -ofmt default: ngc Output File Name -ofn file_name default: N/A Target Device -p part-package-speed (For example: xc5vfx30t-ff324-2) default: N/A Clock Enable yes -pld_ce no default: yes Macro Preserve yes -pld_mp no default: yes XST User Guide UG627 (v 11.3) September 16, 2009 www.xilinx.com 261
