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Design Recipes for FPGAs: Using Verilog and VHDL by Peter Wilson

By Peter Wilson

This ebook offers a wealthy toolbox of layout suggestions and templates to unravel useful, every-day difficulties utilizing FPGAs. utilizing a modular constitution, the e-book offers 'easy-to-find' layout thoughts and templates in any respect degrees, including practical code, which engineers can simply fit and observe to their program. The 'easy-to-find' constitution starts off with a layout software to illustrate the main construction blocks of FPGA layout and the way to attach them, permitting the skilled FPGA dressmaker to speedy decide on the best layout for his or her software, whereas supplying the fewer skilled a 'road map' to fixing their particular layout challenge. Written in a casual and 'easy-to-grasp' variety, this important source is going past the rules of FPGA s and description languages to really exhibit how particular designs will be synthesized, simulated and downloaded onto an FPGA. furthermore, the booklet offers complex concepts to create 'real global' designs that healthy the equipment required and that are quick and trustworthy to enforce. An accompanying CDROM comprises code, attempt benches and simulation command records for ModelSim. This booklet should be an fundamental, well-thumbed source for FPGA designers of all degrees of expertise. * A wealthy toolbox of functional FGPA layout options at an engineer's finger advice * Easy-to-find constitution that permits the engineer to fast find the data to resolve their FGPA layout challenge, and procure the extent of element and knowing wanted * encompasses a CDROM containing code, try benches and simulation documents for ModelSim

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Extra resources for Design Recipes for FPGAs: Using Verilog and VHDL

Example text

The characters can be defined as individual characters or arrays of characters to create strings. The best way to consider characters is an enumerated type. Data type: real Floating point numbers are used in VHDL to define real numbers and the predefined floating point type in VHDL is called real. 0e38 to ϩ10e38. This is an important issue for many FPGA designs, as most commercial synthesis products do not support real numbers – precisely because they are floating point. In practice, it is necessary to use integer or fixed point numbers which can be directly and simply synthesized into hardware.

Typically the FPGA vendor will provide a software toolkit (such as the Xilinx Design Navigator or Altera’s Quartus tools) that manages the steps involved in physical design. Regardless of the particular physical synthesis flow chosen, the steps required to translate the VHDL or EDIF output from an RTL synthesis software program into a physically downloadable bit file are essentially the same and are listed below: 1. Translate 2. Map 3. Place 4. Route 5. Generate accurate timing models and reports 6.

This is useful in comparison to functions where there is generally only a single output (although it may be an array) and avoids the need to create a record structure to manage the return value. Although procedures are useful, they should be used only for small specific functions. Components should be used to partition the design, not procedures, and this is especially true in FPGA design, as the injudicious use of procedures can lead to bloated and inefficient implementations, although the VHDL description can be very compact.

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