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Critical path
A signal in a section of combinatorial logic that limits the speed of the logic. Storage elements begin and end a critical path.
The path within a design that dictates the fastest time at which an entire design can run. This path runs from the source to a sink node such that if...
For Xilinx FPGA's floorplanning gives good results - typical increase of 10-20%
You may also use RPM for small critical blocks, especially if they are used in different places in your design.
Physical Synthesis tools (Amplify etc) are also effective sometime and much easier to use than...
xilinx offset in before
**broken link removed**
BEFORE defines the relationship between data arrival and the next clock edge. For example, OFFSET IN BEFORE indicates that data will be valid at the input pin of a Xilinx device at a specified time before the next clockedge arrives at the...
HDL is better because you can easily introduce new tools into your flow.
Verilog is supported by more tools then VHDL, because it usually used for ASIC design.
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