Microelectronics

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

By Peter Wilson

This publication presents a wealthy toolbox of layout options and templates to unravel sensible, every-day difficulties utilizing FPGAs. utilizing a modular constitution, the booklet offers 'easy-to-find' layout suggestions and templates in any respect degrees, including useful code, which engineers can simply fit and practice to their software. The 'easy-to-find' constitution starts with a layout program to illustrate the major development blocks of FPGA layout and the way to attach them, permitting the skilled FPGA dressmaker to fast decide upon the perfect layout for his or her program, whereas delivering the fewer skilled a 'road map' to fixing their particular layout challenge. Written in a casual and 'easy-to-grasp' kind, this valuable source is going past the foundations of FPGA s and description languages to really reveal how particular designs may be synthesized, simulated and downloaded onto an FPGA. moreover, the e-book presents complex options to create 'real international' designs that healthy the machine required and that are speedy and trustworthy to enforce. An accompanying CDROM includes code, attempt benches and simulation command documents for ModelSim. This ebook might be an imperative, well-thumbed source for FPGA designers of all degrees of expertise. * A wealthy toolbox of functional FGPA layout strategies at an engineer's finger information * Easy-to-find constitution that permits the engineer to fast find the knowledge to unravel their FGPA layout challenge, and acquire the extent of element and realizing wanted * encompasses a CDROM containing code, try out benches and simulation records for ModelSim

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

Sample text

Type testdata is record in0 : std_logic; in1 : std_logic; end; 32 Design Automation and Testing for FPGAs With a new composite type, such as a record, we can then create an array, just as in any standard VHDL type. This requires another type declaration, of the array type itself. type data_array is array (natural range <>) of data_array With these two new types we can simply declare a constant (of type data_array) that is an array of record values (of type testdata) that fully describe the data set to be used to test the design.

For example, if an entity is called and4, and it has 4 inputs (a, b, c, d of type bit) and 1 output (q of type bit), then the component declaration would be of the form shown below: component and4 port ( a, b, c, d : in bit; q : out bit ); end component; 24 A VHDL Primer: The Essentials Then this component can be instantiated in a netlist form in the VHDL model architecture: d1 : and4 port map ( a, b, c, d, q ); Note that in this case, there is no explicit mapping between port names and the signals in the current level of VHDL, the pins are mapped in the same order as defined in the component declaration.

The listing below shows how a basic entity (with no connections) is created, and then the architecture contains both the component declaration and the signals to test the design. all; -- empty entity declaration entity test is end; -- test bench architecture architecture testbench of test is -- component declaration component cct port ( in0, in1 : in std_logic; out1 : out std_logic ); end component; -- test bench signal declarations signal in0, in1, out1 : std_logic; -- architecture body Begin -- declare the Circuit Under Test (CUT) CUT : cct port map ( in0, in1, out1 ); end; This test bench will compile in a VHDL simulator, but is not particularly useful as there are no definitions of the input stimuli (signals in0 and in1) that will exercise the Circuit Under Test (CUT).

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