By Evgeni Stavinov
This ebook is a suite of brief articles on quite a few features of FPGA layout: synthesis, simulation, porting ASIC designs, floorplanning and timing closure, layout methodologies, functionality, quarter and tool optimizations, RTL coding, IP middle choice, and so on. The ebook is meant for procedure architects, layout engineers, and scholars who are looking to enhance their FPGA layout abilities. either amateur and professional good judgment and engineers can locate bits of priceless details. This booklet is written by means of a practising FPGA common sense fashion designer, and includes a lot of illustrations, code examples, and scripts. instead of offering info acceptable to all FPGA proprietors, this publication version makes a speciality of Xilinx Virtex-6 and Spartan-6 FPGA households. Code examples are written in Verilog HDL. All code examples, scripts, and tasks supplied within the ebook can be found on accompanying web site: http://outputlogic.com/100_fpga_power_tips
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Extra resources for 100 Power Tips for FPGA Designers
Writing Synthesizable Code for FPGAs The Verilog language reference manual (LRM) provides a rich set of capabilities to describe hardware. However, only a subset of the language is synthesizable for FPGA. Even if a particular language structure is synthesizable, that doesn’t guarantee that the code will pass physical implementation for a specific FPGA. Consider the following example. reg [7:0] memory[1:2**22]; initial begin memory = 8’h1; memory = 8’h2; end The example will simulate correctly but will result in FPGA physical implementation failure.
Resources  “Standard Gotchas: Subtleties in the Verilog and SystemVerilog Standards That Every Engineer Should Know”, by Stuart Sutherland. Published in the proceedings of SNUG Boston, 2006. pdf 15. Writing Synthesizable Code for FPGAs The Verilog language reference manual (LRM) provides a rich set of capabilities to describe hardware. However, only a subset of the language is synthesizable for FPGA. Even if a particular language structure is synthesizable, that doesn’t guarantee that the code will pass physical implementation for a specific FPGA.
Depends on the synthesis tool. =). 2-state vs. 4-state values 4-state values (‘0’, ‘1’, ‘x’, ‘z’) are inherently not synthesizable. FPGA architecture only supports 2-state values (logic ‘0’ and ‘1’), and synthesis tools will apply different rules to optimize ‘z’ and ‘x’ values during the synthesis process. That will cause a mismatch between synthesis and simulation results (also see Tip #59) and other side effects. Only use ‘z’ values during the implementation of tri-stated IO buffers. translate_on/translate_off compiler directives translate_off and translate_on directives instruct synthesis tools to ignore portions of a Verilog code.