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1.3. Step 3: Preserve Satisfactory Results
You can simplify timing closure by back-annotating satisfactory compilation results to lock down placement of large blocks related to clocks, RAMs, and DSPs.
Similarly, the design block reuse technique enables you to preserve satisfactory compilation results for specific FPGA periphery or core logic design blocks (logic that comprises a hierarchical design instance), and then reuse those blocks in subsequent compilations. In design block reuse, you assign the hierarchical instance as a design partition, and then preserve and export the partition following successful compilation.
Preserving and reusing satisfactory results allows you to focus the Compiler's effort and time on only portions of the design that have not closed timing.
Timing Closure Problem
- Unless locked down, the Compiler may implement design blocks, clocks, RAMs, and DSPs differently from compilation to compilation depending on various factors.
Timing Closure Solutions
- Lock Down Clocks, RAMs, and DSPs—back-annotate satisfactory compilation results to lock down placement of large blocks related to clocks, RAMs, and DSPs.
- Preserve Design Partition Results—preserve the partitions for blocks that meet timing, and focus optimization on the other design blocks.