HDL basics

It a type of approach in digital design where it involves designing a digital system or circuit by first defining its overall architecture and functionality at a high level, and then progressively refining the design by breaking it down into smaller modules.

• Top-down

• Bottom-up

• Top-bottom

• Bottom-top

It a type of approach in digital design where it Involves designing a digital system or circuit by first creating smaller, basic components or modules and then integrating them together to form larger, more complex modules and eventually the entire system.

• Top-down

• Bottom-up

• Top-bottom

• Bottom-top

It can be inserted in the Verilog code for readability and documentation.

• Keywords

• Identifiers

• Comments

• Whitespace

It is ignored by Verilog except when it separates tokens.

• Comments

• Whitespace

• Identifiers

• Keywords

It is written and used as an object reference.

• Keywords

• Identifiers

• Comments

• Whitespace

It is composed of special identifiers reserved to define the language constructs.

• Identifiers

• Comments

• Whitespace

• Keywords

Identifiers MUST start with a:

• Number

• Letter

• Dollar Sign

• Hash Sign

Keywords are typed:

• starting with a dollar sign

• in lowercase

• starting with a hash sign

• capitalized for the first letter of the word

It is an operator that includes *, /, +, -, %.

• Equality operators

• Conditional operators

• Unary operators

• Arithmetic operators

It is a sequence of characters that are enclosed by double quotes and must be contained in a single line.

• Module

• Digit

• Port

• String