Table of Contents
- 1 What are the primitive gates supported by Verilog HDL?
- 2 Which modeling technique describes gate level diagram?
- 3 How do you declare a vector in Verilog?
- 4 What is Buf in Verilog?
- 5 HOW NOT gate is implemented in Verilog?
- 6 What is use of delays in Verilog HDL?
- 7 What are vectors in HDL?
- 8 What is difference between array and vector in Verilog?
- 9 What is gate level modeling in Verilog?
- 10 What are the primitive gates in Verilog HDL?
- 11 Can Verilog be used for RTL coding?
What are the primitive gates supported by Verilog HDL?
Verilog HDL supports built-in primitive gates modeling. The gates supported are multiple-input, multiple- output, tristate, and pull gates. The multiple-input gates supported are: and, nand, or, nor, xor, and xnor whose number of inputs are two or more, and has only one output.
Which modeling technique describes gate level diagram?
Gate level modeling is used to implement the lowest-level modules in a design, such as multiplexers, full-adder, etc. Verilog has gate primitives for all basic gates. Verilog supports built-in primitive gates modeling. The gates supported are multiple-input, multiple-output, tri-state, and pull gates.
What are the delay specifications available in Verilog HDL for modeling a logic gate?
If there are three delays specified, they represent rise, fall, and turn-off delays, respectively.
- One Delay Format. module des (input a, b, output out1, out2);
- Two Delay Format.
- Three Delay Format.
How do you declare a vector in Verilog?
The code snippet below shows the general syntax which we use to declare a vector type in verilog. // General syntax to declare a vector type ; When we define the size of the vector we must specify the most significant and least significant bits (MSB and LSB).
What is Buf in Verilog?
BUF is a single-input single-output gate, similar to NOT, that copies its input value to its output without inversion. The convention for built-in gates is that their output signal is the first port and the remaining ports are inputs. Except for NOT and BUF, these primitive gates can have any number of inputs.
How do you use primitive in Verilog?
Verilog provides a standard set of primitives, such as AND, NAND, NOT, OR, and NOR, as a part of the language. These are also known as built-in primitives….Verilog UDP Symbols.
| Symbol | Comments |
|---|---|
| 0 | Logic 0 |
| 1 | Logic 1 |
| x | Unknown, can be either logic 0 or 1. It can be used as input/output or current state of sequential UDPs |
HOW NOT gate is implemented in Verilog?
Verilog code for NOT gate using dataflow modeling module NOT_data_flow (output Y, input A); module is a keyword, NOT_data_flow is the identifier, (output Y, input A) is the port list. Then we have semicolon to end the statement. Next is the assignment statement in data flow modeling.
What is use of delays in Verilog HDL?
A delay, as used in Verilog, is a number of time units it takes to receive a response of a circuit. In a simple forward combinational circuit this is a time it takes to obtain a change on an output when an input is altered.
What are different types of delay control?
We can specify the delay based timing control in three ways:
- Regular delay control: It will be specified on the procedural assignment left as a non-zero number.
- Intra- assignment delay control: In this case, delays will be specified on the assignment operator’s right-hand side.
What are vectors in HDL?
A term used to describe a multiple-bit net or register that contains a range specification whose MSB and LSB are different expressions. Vector net and registers are treated as unsigned quantities.
What is difference between array and vector in Verilog?
In Verilog-2001, arrays are indexed from left-bound to right-bound. If they are vectors, they can be assigned as single units, but not if they are arrays. Verilog-2001 allows for multiple dimensions. In Verilog-2001, all data types can be declared as arrays.
Is Buf a primitive in Verilog?
LRM §7. Verilog has a number of built-in primitives that model gates and switches….Description:
| Name | Gate Type | Terminals |
|---|---|---|
| Logic | and, nand, or, nor, xor, xnor | Output, Input(s) |
| Buffer and inverter | buf, not | Output(s), Input |
What is gate level modeling in Verilog?
Gate level modeling is virtually the lowest level of abstraction because the switch-level abstraction is rarely used. Gate level modeling is used to implement the lowest-level modules in a design, such as multiplexers, full-adder, etc. Verilog has gate primitives for all basic gates. Verilog supports built-in primitive gates modeling.
What are the primitive gates in Verilog HDL?
Verilog HDL supports built-in primitive gates modeling. The gates supported are multiple-input, multiple- output, tristate, and pull gates. The multiple-input gates supported are: and , nand , or , nor , xor , and. xnor whose number of inputs are two or more, and has only one output.
What is behavioural modeling in Verilog HDL?
Behavioral modeling is the highest level of abstraction in the Verilog HDL. All that a designer need is the algorithm of the design, which is the basic information for any design. This level simulates the behavior of the circuits; the details are not specified.
Can Verilog be used for RTL coding?
Verilog has built in primitives like gates, transmission gates, and switches. These are rarely used in design (RTL Coding), but are used in post synthesis world for modeling the ASIC/FPGA cells; these cells are then used for gate level simulation.