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Correlation of synthesis and place and route ..

The gatelevel netlist from the synthesis tool is taken and imported into place and route tool in Verilog netlist format. All the gates and flip-flops are placed; clock tree synthesis and reset is routed. After this each block is routed. The P&R tool output is a GDS file, used by foundry for fabricating the ASIC. Backend team normally dumps out SPEF (standard parasitic exchange format) /RSPF (reduced parasitic exchange format)/DSPF (detailed parasitic exchange format) from layout tools like ASTRO to the frontend team, who then use the read_parasitic command in tools like Prime Time to write out SDF (standard delay format) for gate level simulation purposes.

During which part of the fpga flow you specify the clock frequency for the design?
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There is another kind of simulation, called timing simulation, which is done after synthesis or after P&R (Place and Route). Here we include the gate delays and wire delays and see if DUT works at rated clock speed. This is also called as SDF simulation or gate level simulation.

Place and Route process but i ..

29/04/2010 · what are translate, map, place and route and a bit ..
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Synthesis is the process in which synthesis tools like design compiler or Synplify take RTL in Verilog or VHDL, target technology, and constrains as input and maps the RTL to target technology primitives. Synthesis tool, after mapping the RTL to gates, also do the minimal amount of timing analysis to see if the mapped design is meeting the timing requirements. (Important thing to note is, synthesis tools are not aware of wire delays, they only know of gate delays). After the synthesis there are a couple of things that are normally done before passing the netlist to backend (Place and Route)

Place-and-route (P&R) describes several processes where the netlist elements are physically places and mapped to the FPGA physical resources, to create a file that can be downloaded in the FPGA chip.


Synthesis, Place and route or layout discussion
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Precision Physical features post-place-and-route physical synthesis to meet aggressive timing requirements for complex FPGA designs.
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