Microsoft Word - Digital Logic Design v_4_6a
case(step) 0 : $display ( "starting step” ); 1 : $display ( "step number 2" ); 2 : $display ( "step 3" ); default : $display ( " ...
7.9. Code Modularization As the code gets more complex and size increases, it is important to modularize the code by developing ...
7.10. Additional Resources Wakerly, I. Digital Design. (2006) Prentice Hall Chapter 5 “Hardware Description Language” Palnit ...
7.11. Problems Refer to http://www.EngrCS.com or online course page for complete solved and unsolved problem set. ...
Chapter 8 “VHDL”. VHDL Hardware Description Language (VHDL) 8.1. Key concepts and Overview History Steps in HDL design Arc ...
8.2. History Hardware Description Language (HDL) is used by designers to describe circuit functionality in high level language. ...
8.3. Steps in VHDL design The process of design may be divided into front-end and backend. Where: The Front-end section includ ...
General VHDL Semantics VHDL similar to other languages has many constructs and rules. The following list contain some of the m ...
8.4. Entity and Architecture The remainder of this document discusses the VHDL infrastructure, common structures and syntax. The ...
Architecture Definition Architecture code defines the function of the device. It is highly recommend that pseudo code or other ...
8.5. Declarations Signal and Variable Declarations Signal declaration gives the same information about a signal as in a port d ...
Predefined Operators VHDL is a strongly typed language which means that the complier issues error messages if types in an oper ...
‘W’, -- Weak Unknown ‘L’, -- Weak 0 ‘H’, -- Weak 1 ‘-’, -- Don’t care ); subtype STD_LOGIC is resolved STD_ULOGIC Array The fo ...
type type_name is array (type range <> ) of element_type; The most important array type in VHDL is the IEEE 1164 standard ...
architecture AbutNotB_arch of AbutNotB function ButNot (A, B: bit) return bit is -- function definition begin if B = ‘0’ then re ...
declarations. Once a library is included using the library statement, use statement shown below is used to include the desired l ...
Resolved types are declared with resolution functions. Example: NAND gate coupled to an output enable Note: Even though it is ...
8.6. Operators This section provides an overview of logical, relational, arithmetic and other operators. Although, this is an ex ...
Right: integer or real type. * Multiplication Left: integer or real type. Right: any physical type. Same as right / Division Lef ...
8.7. Behavioral Design VHDL design may be conducted using structural or behavioral approach. In structural design, the basic bui ...
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