By Peter Wilson
This publication offers a wealthy toolbox of layout ideas and templates to resolve functional, every-day difficulties utilizing FPGAs. utilizing a modular constitution, it presents layout thoughts and templates in any respect degrees, including practical code, that you can simply fit and follow on your program. Written in a casual and straightforward to know kind, this useful source is going past the foundations of FPGAs and description languages to illustrate how particular designs could be synthesized, simulated and downloaded onto an FPGA. moreover, the publication presents complicated recommendations to create ‘real global’ designs that healthy the machine required and that are speedy and trustworthy to enforce.
- Examples are rewritten and verified in Verilog and VHDL
- Describes high-level functions as examples and gives the construction blocks to enforce them, allowing the scholar to begin sensible paintings directly away
- Singles out crucial elements of the language which are wanted for layout, giving the coed the data had to wake up and operating quickly
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Extra info for Design Recipes for FPGAs
If each pin is to be defined independent of the order of the pins, then the explicit port map definition needs to be used: d1: and4 port map ( a => a, b => b, c => c, d => d, q => q); The final thing to note is that this is called the default binding. The binding is the link between the compiled architecture in the current library and the component being used. and4(behaviour) port map (a,b,c,d,q); Procedures Procedures are similar to functions, except that they have more flexibility in the parameters, in that the direction can be in, out or inout.
18 A VHDL Primer: The Essentials Operator ϩ Ϫ * / abs mod rem ** Description Addition Subtraction Multiplication Division Absolute Value Modulus Remainder Exponent Example out1 Ͻϭ in1 ϩ in2; out1 Ͻϭ in1 Ϫ in2; out1 Ͻϭ in1 * in2; out1 Ͻϭ in1/in2; absin1 Ͻϭ abs(in1); modin1 Ͻϭ mod(in1); remin1 Ͻϭ rem(in1); out1 Ͻϭ in1 ** 3; Comparison operators VHDL has a set of standard comparison operators built in, which are self-explanatory. The list of operators are ϭ, /ϭ, Ͻ, Ͻϭ, Ͼ, Ͼϭ. 4 Shifting functions VHDL has a set of six built in logical shift functions which are summarized below: Operator sll srl sla sra rol ror Description Shift Left Logical Shift Right Logical Shift Left Arithmetic Shift Right Arithmetic Rotate Left Rotate Right Example reg Ͻϭ reg sll 2; reg Ͻϭ reg srl 2; reg Ͻϭ reg sla 2; reg Ͻϭ reg sra 2; reg Ͻϭ reg rol 2; reg Ͻϭ reg ror 2; Concatenation The concatenation function XE ‘VHDL:concatenation’ in VHDL is denoted by the & symbol and is used as follows: A <= ‘1111’; B <= ‘000’; out1 <= A & B & ‘1’; -- out1 = ‘11110001’; 19 Design Recipes for FPGAs Decisions and loops If-then-else The basic syntax for a simple if statement is as follows: if (condition) then ...
For example, if two signals are equal, then set an output high would be written in VHDL as: if ( a = b ) then out1 <= ‘1’; end if; If the decision needs to have both the if and else options, then the statement is extended as follows: if (condition) then ... statements else ... statements end if; So in the previous example, we could add the else statements as follows: if ( a = b ) then out1 <= ‘1’; else out1 <= ‘0’; end if; And finally, multiple if conditions can be implemented using the general form: if (condition1) then ...