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Extra info for Advanced Xilinx Fpga Design With Ise
2% route) Timing Closure with Timing Analyzer - 22 © 2003 Xilinx, Inc. All Rights Reserved I/O Timing: Solutions • • Use a DCM to remove clock distribution delay Register all top-level inputs and outputs – • IOB flip-flops have the best timing Increase the slew rate or drive strength on outputs – Only available for LVCMOS and LVTTL I/O standards Timing Closure with Timing Analyzer - 23 © 2003 Xilinx, Inc. All Rights Reserved Outline • • • • Timing Closure with Timing Analyzer - 24 Timing Reports Interpreting Timing Reports Report Options Summary © 2003 Xilinx, Inc.
All Rights Reserved Timing Reports • Timing reports enable you to determine how and why constraints were not met – • The Project Navigator can create timing reports at two points in the design flow – – • Reports contain detailed descriptions of paths that fail their constraints Post-Map Static Timing Report Post-Place & Route Static Timing Report The Timing Analyzer is a utility for creating and reading timing reports Timing Closure with Timing Analyzer - 6 © 2003 Xilinx, Inc. All Rights Reserved Using the Timing Analyzer • • • Create and open a report in the Timing Analyzer by doubleclicking on Post-Place & Route Static Timing Report Open a plain text version of the report Start the Timing Analyzer to create custom reports by doubleclicking on Analyze Post-Place & Route Static Timing (Timing Analyzer) Timing Closure with Timing Analyzer - 7 © 2003 Xilinx, Inc.
All Rights Reserved Too Many Logic Levels: Solutions • • • The implementation tools cannot do much to improve performance The netlist must be altered to reduce the amount of logic between flip-flops Possible solutions: – Check whether the path is a multi-cycle path • – – – If it is, add a multi-cycle path constraint Use the retiming option during synthesis to distribute logic more evenly between flip-flops Confirm that good coding techniques were used to build this logic (no nested IF or CASE statements) Add a pipeline stage Timing Closure with Timing Analyzer - 21 © 2003 Xilinx, Inc.