By Evgeni Stavinov

This publication is a suite of brief articles on a number of points of FPGA layout: synthesis, simulation, porting ASIC designs, floorplanning and timing closure, layout methodologies, functionality, sector and gear optimizations, RTL coding, IP center choice, and so forth. The publication is meant for approach architects, layout engineers, and scholars who are looking to increase their FPGA layout talents. either beginner and professional common sense and engineers can locate bits of necessary details. This publication is written through a practising FPGA common sense clothier, and features a lot of illustrations, code examples, and scripts. instead of supplying info acceptable to all FPGA proprietors, this e-book version specializes in Xilinx Virtex-6 and Spartan-6 FPGA households. Code examples are written in Verilog HDL. All code examples, scripts, and initiatives supplied within the ebook can be found on accompanying web site: http://outputlogic.com/100_fpga_power_tips

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SystemVerilog is also fully backwards compatible with previous Verilog versions. SystemVerilog is supported by most of the commercial simulators: ModelSim, VCS, NCSim, and others. Synthesizable portion of the SystemVerilog standard is supported by Synplify and Precision synthesis tools. At the time of writing of this book, Xilinx XST doesn’t provide any SystemVerilog support. Design synthesis and verification environments are often written using both SystemVerilog and Verilog languages. One approach used in large designs is illustrated in the following figure.

Sum(sum[15:0])); localparam keyword is similar to parameter. It is assigned a constant expression, and has a scope inside a specific module. It is defined as: localparam = ; It is recommended not to use `define and parameter for module-specific constants, such as state values, and use localparam instead. Operand size mismatch Verilog specification defines several rules to resolve cases where there is size mismatch between left and righthand side of an assignment or an operator.

Assertions can be placed both inside the RTL code, which makes updates and management easier, or outside, to keep synthesizable and behavioral parts of the code separate. SystemVerilog provides assertion specification that is used in verification environments of many ASIC designs. SystemVerilog assertions can be applied to the following elements of a design: variable declarations, conditional statements, internal interfaces, and state machines. Assertions are supported by several commercial simulators, for example ModeSim and VCS.

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