What does #1 do in Verilog?

The #1 is an indication in Verilog to model delays. One typically uses #1 to model combinational delays and flip flop delays.

How do you represent numbers in Verilog?

Numbers in Verilog You can specify constant numbers in decimal, hexadecimal, octal, or binary format. Negative numbers are represented in 2’s complement form. When used in a number, the question mark (?) character is the Verilog alternative for the z character.

How do you define decimal numbers in Verilog?

For example, decimal 13 is 1101 in binary: 8 + 4 + 1 = 13 . With decimal numbers, we’re used to the idea of using a decimal separator, a point or comma, to separate integer and fractional parts. 1001 is one thousand and one, whereas 10.01 is ten and one hundredth.

How do you represent floating point numbers in Verilog?

Floating points are stored using a mantissa and exponent. They can represent a much wider range of values, but are more complicated to manipulate.

How do you declare a constant in Verilog?

In Verilog-1995[6], there are two ways to define constants: the parameter, a constant that is local to a module and macro definitions, created using the `define compiler directive. A parameter, after it is declared, is referenced using the parameter name.

How do you represent register data in Verilog?

Register data types are used as variables in procedural blocks. They store logic values only (no logic strength). A register data type must be used when the signal is on the left-hand side of a procedural assignment. Verilog-2001 adds the ability to initialize variables at the time they are declared.

What does D mean in Verilog?

‘d or ‘D : decimal. default is decimal. Page 2. Verilog – Representation of Number Literals(cont.) ▶ Possible values for ”value” are dependent on the radix.

What is constant in Verilog?

Verilog constants are literals, genvars parameters, localparams and specparams. Verilog also has variables and nets. Variables must be written by procedural statements, and nets must be written by continuous assignments or ports.

What is Verilog – representation of number literals (Cont)?

Verilog – Representation of Number Literals (cont.) Literal numbers may be declared as signed: 4shf. I4 bit number (1111) interpreted as a signed 2s complement value. IDecimal value is -1. Signed values are not necessarily sign extended because the sign bit is the MSB of the size, not the MSB of the value.

What is the range of the sign bit in Verilog?

In our examples, we include the sign bit: thus Q4.4 is from -8 to 7.9375 (7 + 15/16): we discuss range later in this post. Maths Just Works! All the usual binary maths work when used with fixed-point numbers. Verilog can generally synthesize addition, subtraction, and multiplication on an FPGA.

What are the operators in iverilog?

IVerilog operators operate on several data types to produce an output INot all Verilog operators are synthesible (can produce gates) ISome operators are similar to those in the C language IRemember, you are making gates, not an algorithm (in most cases) Verilog – Operators Arithmetic Operators IThere are two types of operators: binary and unary

What are the different types of Verilog statements?

Verilog has two basic types of statements 1. Concurrent statements (combinational) (things are happening concurrently, ordering does not matter) Gate instantiations. and (z, x, y), or (c, a, b), xor (S, x, y), etc.