Xilinx synthesis report file

The synthesis engine takes as input the HDL design files and a library of primitives. Primitives are not necessarily just simple logic gates like AND and OR gates and D-registers, but can also include more complicated things such as shift registers and arithmetic units. Primitives also include specialized circuits such as DLLs that cannot be inferred by behavioral HDL code and must be explicitly instantiated. The libraries guide in the Xilinx documentation provides an complete description of every primitive available in the Xilinx library.

Note that, while there are occasions when it is helpful or even necessary to explicitly instantiate primitives, it is much better design practice to write behavioral code whenever possible.

XST takes as input a verilog. A synthesis report file. This step mostly seems to be necessary to accommodate different design entry methods, such as third-part synthesis tools or direct schematic entry. Whatever the design entry method, the result is an. The output of the Xilinx map tool is an. The design is then placed and routed, meaning that the resources described in the. The delays associated with interconnect on a large FPGA can be quite significant, so the place and route process has a large impact on the speed of the design.

The place and route engine attempts to honor timing constraints that have been added to the design, but if the constraints are too tight, the engine will give up and generate an implementation that is functional, but not capable of operating as fast as desired. Be careful not to assume that just because a design was successfully placed and routed, that it will operate at the desired clock rate. The output of the place and route engine is an updated. All that remains is to translate the.

Then the programmer is used to download the design into the FPGA, or write the appropriate files to a compact flash card, which is then used to configure the FPGA. This is done by means of constraint statements inside a universal constraints file. I don't think it's necessary to know all the files used by ISE. Actually not all these files are documented. You can search in the the document devref. If any file that is not documented in devref.

Thanks everyone, issue solved -Luis. Log In to Answer. Related Questions Nothing found. Don't see what you're looking for? Ask a Question. Get Support. A: Initial support of Verilog was included in the 5. XST now supports all but one configurations of the synthesizable features of Verilog , and all these newly supported constructs are documented in the XST User Guide. Xilinx will continue to expand Verilog support with each new major and minor release of the software.

SystemVerilog is not yet supported by XST. The flexibility of mixed language support will improve with each release, but most designs should have no problems being processed with the current tools.

Use a black box flow to achieve mixed language synthesis with versions of XST prior to 6. A: In order to achieve better quality of results and improve the overall design flow, XST is moving towards tight integration of Synthesis and Implementation tools.

Creation of NGC format files from synthesis is the first step required to build mapped designs. This command-line utility has been developed for two reasons: 1 To view an EDIF representation of an XST design 2 To pass information to third party synthesis tools for black box utilization information.

Q: Does XST have a schematic viewer available? A: Yes, an RTL viewer was introduced with the 5. XST 5. A technology viewer has been added in the 7. The quality and speed of RTL and Technology views were greatly improved in the 8. Not only does this provide more accurate timing information for optimization, but the slice packing information is passed to implementation for more consistency during mapping.

Looking forward, the XST team is developing two other flows that will improve estimation and overall results. First, XST will contain an internal placer and packer that will estimate place and route results and, therefore, provides more accurate wireload delays to be used during optimization.

A second flow will read a routed NCD file to obtain actual placed and routed timing information for optimization. The XST log file includes a detailed timing report that shows all the clocks in the design with the type of clock buffer used and the number of loads for each.

Wireload models are used to estimate maximum clock frequency as well as maximum input and output times. A: The first support of UCF-style timing constraints began with the 5. The flow is for users to define their timing constraints using the traditional methods Constraints Editor, etc.