Cadence tutorial 2

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Cadence tutorial 2

This tutorial is similar to this tutorialbut it demonstrates Ocean simulation for the FreePDK 45nm technology. You must first set up the proper CAD environment. Follow the steps described in the Linux tutorial to ensure that this is done properly. It is a good idea to have a separate directory for each simulation.

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Make a new directory for your simulation. You will need at least 4 files to run the simulation. One file is the ocean file, which is described in a few steps. The other three files define the circuit that you will simulate. They must have these names:. Notice that there are several parameters in the netlist that are undefined. We will define those later in the Ocean script. Ocean is a scripting environment that wraps around Spectre to make it easier to simulate.

Here is the Ocean script that we will use in this tutorial:. Ocean will execute the script that you wrote. Since you asked for a plot, ocean will initiate the plot window, and you should see the output results.

Something like:. Congratulations, you have finished the tutorial! The text files used in this tutorial are attached at the bottom of the page. Please look at these tutorials for more information on simulating with Spectre outside of Cadence:. Jump to: navigationsearch. Personal tools Log in. Namespaces Page Discussion. Views Read View source View history.

This page was last modified on 26 Augustat This page has been accessed 15, times.Sub-Sonic is a simple cadence for beginner drumlines. This drum cadence offers a fun and entertaining sound while still being simple enough for new drummers.

Sub-Sonic is an excellent cadence for 6th, 7th and 8th grade drumlines. This cadence is simple and fun and is managable for most beginner drummers. Zombie Squirrels is an exciting beginner drum cadence that introduces a few new rhythms.

Cadence Virtuoso – Schematic & Simulations – Inverter (45nm)

This drum cadence is great for younger groups or for programs that are in need of a quick fun cadence. This drum cadence is recomended for 7th and 8th grade drumlines. Storm is a very basic cadence that is simple enough for any drumline to play.

This cadence consists of only a few basic rhythms and no accents. We highly recommend this cadence for 6th and 7th grade drummers. Navigator is another one of our basic cadences. This cadence features several simple rhythms and is also very repetitive. Navigator is a great one for younger groups or can be used as an easy second cadence for groups that are capable of playing a Level 2 Cadence. Time Travel is a great cadence for any beginner drumline. This is also a great cadence for first time tenor drummers as it helps demonstrate how the hands need to move and flow around the drums.

Tadpole is a great cadence for younger drumlines who will be soon be transitioning to a more advanced group such as a high school drumline. This cadence is simple, fun, and packs quite a punch for a Level 1 cadence! Bumper is the easiest cadence in Street Beatz Pack 1. This cadence is perfect for middle school drumlines that are looking for a fun and simple cadence to learn quickly.

Cargo is a simple Level 1 Cadence but is slightly more complex than Bumper. This cadence utilizes 2 bass drum and a quint tenor drum configuration. ProJam is considered to be a difficult Level 1 Cadence. If you are debating betwen selecting a Level 1 or 2 Cadence for your drumline, we recommend that you choose ProJam. This is a great cadence that's simple but won't put more advanced players to sleep. Earthquake is perfect for young drumlines and is a great first cadence for any group. This cadence features unison bass drum parts to make finding the beat as simple as it can possibly be.

Raven is a short basic cadence that is broken down into 3 simple sections in order for it to be learned quickly and efficiently. Raven is the perfect cadence for 6th grade drumlines. Vampire is a very simple cadece that consists of 3 repetitive sections. This is a great, fun sounding first cadence for any beginner group. Explore Community Education Site. Sheet Music. Middle School Percussion. High School Percussion. Drummer Bot. College Percussion. Drum Set. Drum for College.We can run SKILL functions to complete the same functions that we usually do in the graphic environment, such as schematic or layout editing.

cadence tutorial 2

Invoke Cadence documentation as in Tutorial 1. Expand one topic and select the first item under it, click the 'Open' button, and then the browser will load that document. To create a inverter chain, we first need the basic cell, the inverter.

Usually it is most efficient to create these low level cells in Cadence manually, or to pull them from a standard cell library if one is available. We will use the inverter cell 'bcInverter' created in our previous tutorials as the basic cell for this example. After Tutorial 1the inverter cell schematic and symbol should be ready.

After Tutorial 3we have the inverter layout. To be able to manipulate that layout properly with SKILL functions, we need to do one more thing: create the cell bounding box. To do this, first open the 'bcInverter' layout view. In the 'LSW' window, select the ' text' layer. In the 'Layout Editing' window, move your mouse to the upper-left corner of your inverter, hit the key 'R' to draw a rectangle in the 'text' layer. Click the mouse at the corner of the cell where you want to define your bounding box, then pull the mouse to the lower-right corner of the inverter and click mouse again.

Hit the 'Esc' key to escape from the rectangle drawing command.

Exp2 2 computation of raise and fall time delay of inverter

Save the layout. Now your inverter is enclosed by a white box, which the SKILL functions will later interpret as its bounding box. In the figure below, we have elected to outline the outermost boundary of the layout, which is not necessarily the only way to place the bounding box.

Decide carefully how you want to align this box relative to the cell, because it will be used to place cell layout views later on.

For example, you might find that you can position cells closer together than the absolute boundary of the layout view by allowing their nwells and power rails to overlap, thereby reducing overall area. Set up and start the Cadence icfb tool as in Tutorial 1. In the 'icfb' window, type the following line in the command input area, and then hit the 'enter' key.

After it completes, check the library Manager. Note - if you do not have a library called 'Tutorial,' then you might encounter problems running this script Open the schematic, it should look like:. Open the layout; it should look like:.

This problem occurs because the skill script defines the pin locations as the center of the boxes you drew during Tutorial 3 Once is has these locations, its creates a path from pin A to pin B.

If these two pins are not located on the same x-axis, then the resulting path will not be perfectly horizontal. Now you have a 6-bit inverter chain schematic and layout, which was automatically created by SKILL instead of being drawn by hand.

If you changed your mind and want a bit inverter chain instead, you can simply make a small change in the two SKILL files. Enter the 'skill' directory and open the file 'invChainSchematic.

Open the file 'invChainLayout. You will get a new cell with the schematic and layout of the bit inverter chain in just a few seconds.

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Actually, you can get an inverter chain of any length by simply changing the number of inverters 'N' in the SKILL files and rerunning them. You can write your own skill programs to create schematic and layout for specific cells such as SRAM Array. The above two example files invChainSchematic.

Please read them carefully, especially all the comments. After loading your SKILL file in icfb command line, you will get error messages if there are syntax errors in your program.Tutorials Products Services Contact Us. Tutorials Home. This tutorial is for Windows XP but most of the things should be easy to be extended for Linux or Unix. Others may like to get a general view of the design process which is follows: 1.

Select the components capacitors, sockets, etc. Once you have a list, collect the datasheets and look at the suggested footprints that is, the hole sizes or pads in those documents. You must get the physical part in hand to verify pin number 1 orientation and dimensions. For each component, you have to create a footprint. Footprint is a physical view of the component that includes the holes through your board or pads for surface mount components. Footprints can be reused in the same board several times.

In practise, you will already have most of the footprint available and you should need to create only few additional footprints for a new design. You will need to be careful to verify that the existing footprint in your design library matches the mechanical dimension of the component according to its datasheet. There are reference designs available from companies like freescale. You may get their allegro design and export the footprints that you can use after minimal or no change.

You have to create a schematic view of your board. This means adding different components on your board and connecting them with wires. We will be creating Schematics using Orcad. If you are not familiar with Orcad you may want to take an Orcad tutorial. Once you have the schematic, you have to generate the netlist and import it to Allegro PCB Editor to complete the board layout.

You place the components, define power and ground planes, route physical wires using this tool. Finally you must verify the board for errors. After you have the board layout, you generate a few files called artwork or gerber.

The gerber files are used by PCB Manufacturer to manufacture the board. Note: Most designs today are use high speed signals.Design libraries are the places where you store your designs. The first step of IC design in Cadence is to create a design library so you can develop your design.

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Now we are going to create a design library called "tutorial" then put the design of the combinational adder in it. First of all, cd to your " cadence " directory that you'd created in tutorial 1, then type icfb to start Cadence.

Now we are going to create a design library named tutorial.

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The technology file is then compiled and the library is created. You can see " tutorial " appears in Library Manager Window. Click " tutorial " to see what do you have in it. Of course, there's nothing there at this moment.

You can check on " tsmc18 " too. It contains standard cells symbolic cells defined in the technology. You can click left on cells to see what views do they have.

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Once you have created a design library, you can start to put your design into it. We are going to design a combinational logic from bottom up. To create a cell named " inv " in " tutorial " library. Cell " INV " with " layout " view in library " tutorial " will be created and opened up for you to edit. Two more windows will be brought up.

The second one is Virtuoso Layout Editing window. LSW display the layers defined in the technology. You might notice that some layer names appear more than once in LSW. Layers with drawing purpose will show in the mask layout.

cadence tutorial 2

Layers with pin purpose are not part of the mask layout. In next tutorial, we are going to design layout views for inv. But let's save and close the cell view and take a break now.The objective of this section is to learn how to get the environment ready for the tool, take care of the licensing issues, and start the tool. This folder will be the working directory for Cadence Virtuoso. In the working directory source the provided Setup file. Sourcing this file will take care of all the needed environment variables, and all the licensing as well.

After sourcing the setup file, launch the tool. Read the log in that window to make sure that everything went well with no errors or warnings. The objective of this section is to know how to create a new project, create a new schematic, and simulate it. A new window asking for the technology file for your new library will show up. Then select the desired PDK, which is gpdk in this tutorial. Now inside your project library create a new schematic for a sub-cell. A new window asking for details about your new cell view will open.

Make sure to pick a name for your cell that describes its functionality and highlights any other important details about that cell. Now the Schematic Editor window will open as in Figure 2, and the Library Manager window will indicate the changes you just made as in Figure 3. Figure 3 Library Manager window after creating a new schematic. Note that every action can be either done through the Create menu, the GUI buttons in the tool bar, or using hot keys.

You can learn about the actions and their corresponding icons and hot keys from the Create menu. Make sure that your schematic has no errors or warnings, and then proceed.

To prepare the schematic to be used to create a symbol for your cell, make sure to use Pins for your inputs, outputs, and supply and ground. Figure 4 shows the schematic of an inverter, which is ready to be used in symbol creation. Note that inputOutput pin type was used for the supply and the ground. Having a symbol for each cell in a project is a very powerful tool that makes test benches and larger systems creation an easy task.

Make the desired changes and press OK.

ToolsCadenceTutorialsBasicSKILLFreePDK

The Symbol Editor window shown in Figure 6 will open. Start exploring the Symbol Editor window, and note the similarities between it and the Schematic Editor window.Take advantage of the best chance of winning on sports betting and get acces to daily free bets, winning sportsbook picks and expert opinion by downloading the official " Sport Betting Tips - by VINCENT BRAVO " app, available on your mobile device or tablet.

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