9/30/13Basic VLSI Layout Design Using Microwind: Part 1 | Groolo Microwind Tutorials 23rd August 2009 Basic VLSI Layout Design Using Microwind: Part 1 [http://1.bp.blogspot.com/__ZYOrRwYrZ0/SpGPlj9L1YI/AAAAAAAAAH8/CT6qLi1bsBE/s1600h/Groolo.gif] Hello, [http://2.bp.blogspot.com/__ZYOrRwYrZ0/SpEmv0LzJTI/AAAAAAAAAFw/hU56jkApBvc/s1600h/Twitli.gif] In this small lab tutorial series you will be learning the use of Microwind. I appreciate yourfeedback. Feel free to express yourself. Special thanks to my teachers and friends who helped me in learning, publishing, editing, many more tings... Thank you very much. Grab the tool from here. http://www.microwind.net/downloads.php [http://www.microwind.net/downloads.php] Unzip it and find the .exe file. If you have clicked on the right icon, you should be able to see this: (Click on the image to enlarge and see clearly) On the right side of the window, you can see a pallet. This is your basic tool. Using palette, you can lay different layers, for example, Polysilicon, www.microwind.me/2009/08/hello-in-this-small-lab-tutorial-series.html 1/7 3 Ads Clock to the clicked region. and then click on the layer to which you want to apply. Important note: Once you have applied clock to any node (point or region). 1. If you are a beginner. Looks like an eye eh? If you want to see voltage. We usually apply this to N Well (to avoid floating) and to pMOS.html 2/7 . current or few other parameters of the node. At the top of the screen you can see various icons. Simply click and click on the region to be applied. We shall come to them as and when we use them.microwind.9/30/13 Basic VLSI Layout Design Using Microwind: Part 1 | Groolo Microwind Tutorials Diffusion Layer. do not change the default values. It grounds the region over which it is placed. 4. click on it. Come to the main area (Black: Substrate) hold the left mouse button. move the mouse holdingthe left button. Usually it is used to see the output during simulation. high times and many other specifications. then click on Red Icon with Polysilicon written on it (They were a bit considerate to do that favor to us J ). N-Well etc. low time. It can also be used in debugging the layout by checking behavior of a particular node. (Click on the image to enlarge and see clearly) To make use of any of the following palette tools. You can see few other buttons too. As simple as ground. This happens to maintain binary counting. 2 Ground. This is used to supply the necessary voltage required for the layout. Let us explore each of them one by one. Vdd Supply. then this is used. the next time when you click on it to apply it to other region. Ahem. The next set of palette tools are to be used in a bit different way. much easier than MS www. if you need a polysilicon layer.me/2009/08/hello-in-this-small-lab-tutorial-series. For example. You can specify the period. it takes a period twice that of last click automatically. Lets have a look at the tools which are there in the top menu bar: www.microwind. but it increases understandability of the circuit. (If you know me. use this option. (Try it now) 5. Its simple. The ‘+’ sign indicates that it is doped higher than the P substrate. then have a courtesy to offer) Now let us explore few tools which can enhance the layout and make it indeed a layout. If you are a bit tired. P+ Diffusion. You can have a look at various layers in the following figure: (Click on the image to enlarge and see clearly) It was not much difficult. have a cup of tea. I suggest drawing it in the bottom. but make sure that you cover it with N-well. The substrate which we use here is P-substrate(Black Colour). (Click on the image to enlarge and see clearly) 6. Make sure that it surrounds it completely. you have drawn at least some random blocks. You can lay it over P+ Diffusion. When you need to give metallic connection between two different parts of the layout. You can simply place it over P-substrate (Why? :) ) 9. We are supposed to lay it under N-well. I assume that by now. You need to use an appropriate contact to do this. The following diagram illustrates various contacts. I recommend drawing it on the top. But it doesn’t need any well.9/30/13 Basic VLSI Layout Design Using Microwind: Part 1 | Groolo Microwind Tutorials Paint. N+ Diffusion. You can draw P+ diffusion first. The much discussed N well is ready to be drawn now! (Finally). You have covered a major part of it. it doesn’t get connected (attached) automatically. In fact the whole tool is pretty simple. Follow the convention everywhere. 7.me/2009/08/hello-in-this-small-lab-tutorial-series. Its same as P+. It won’t make any difference wherever you draw. Please note that when you draw the metal layer over say a polysilicon. The metal 1 Layer.html 3/7 . Enough kidding. Polysilicon. 8. Opens already existing layout. (Even here).9/30/13 Basic VLSI Layout Design Using Microwind: Part 1 | Groolo Microwind Tutorials [http://1. 2. release the mouse button. (See image for illustration) [http://1. delete or remove a particular area. Yet another important tool. If you want to move a complex layout.microwind.me/2009/08/hello-in-this-small-lab-tutorial-series. click on this icon and then click on that particular layer. When you click on this.bp. It is used if you want to move a certain layout from on place to another. In the above figure.bp. Save the current layout. then hold the left mouse button and select the layer which you need to selectively remove. Click once when you get satisfactory result. (I suggest trying this by drawing a very simple layer) 6. first click on shoot. then you can draw the last layer you selected from palette.MSK extension. If you want to store to a specific location go to File>Save As. It can also be a layer or a complete device. 4. 3. go to the horizontal edge you want to resize and then draw an imaginary rectangle smaller than the edge such that it over laps the layer and substrate and resize.com/__ZYOrRwYrZ0/SosCqQRmhGI/AAAAAAAAAFQ/z4X6WLuuXIg/s1600h/Microwind_tutorial6. You can select this and resize the layout. To completely remove more than one layer. Resize: This is used when the design fails the design rules. Safely place the area where you want to.html 4/7 . Tip: If you want to remove only a selected portion. browse to that folder and you can open it. Its called draw box. If you have saved your layout somewhere. and again the same mouse holding trick will do it.GIF] I strongly recommend you to try this by drawing a single layer. Basically it may be contact or Vdd or Gnd etc.com/__ZYOrRwYrZ0/SosBRSSip4I/AAAAAAAAAFI/yS2nCTA5jY/s1600-h/Microwind_tutorial5. Stretch (Resize)/Move tool. click on this.blogspot. cover them keeping the left mouse button clicked. The layouts are stored with .blogspot. first click on the tool icon. the gun! To erase. The same holds good for resizing vertically. Hint: If you want to resize horizontally. then again highlight the area by holding the left mouse key and covering that area. Why to draw the same device again which you have already drawn? We have a copy tool. Click on this.GIF] (Click on the image to enlarge and see clearly) 1. I www. Click once when you get satisfactory result. Your best partner. 5. Remember: In silicon real estate.microwind.bp. In such a case. As it says. My next post will be published very soon. 14. Click on this tool and click where you want to add the text. it fits your layout to the screen. 9. click on this tool and then hold the right mouse button and drag it till you cover the contact. (gets drawn on its own when you drag the mouse by holding left key) Zoom In (Maximize) the layout. 13. use this tool. before the starting of the next week. 16. Congratulations! You have successfully completed the first part of the tutorial. 18. use it repeatedly to verify you adhere to them 2-D cross section. click on this.blogspot. good! J DRC: Design Rule Check. every nano meter is precious. This simulates MOS characteristics. www. Tip: Use Ctrl+U to undo. Keep watching this space to keep yourself updated withe the various. the palette disappears.com/__ZYOrRwYrZ0/SosEoKEpK8I/AAAAAAAAAFY/U8emf82HjcM/s1600h/Microwind_tutorial7. (We will come to this in the next part) Measures the distance of various layers. It shows the various input and output waveform. Connect Layers: Suppose you have drawn two layers. 20. It shows the electrical properties. Zoom out to connect the devices in proper alignment. [http://3. you need to make sure that both the layers are connected. Diagram illustrates the same. I suggest using this when you are drawing a large layout. 17. to see various areas. This is like commenting code in programming language.-) Happy learning. It clearly indicates if the layers are connected. It helps to make your layout readable. looks 15.9/30/13 Basic VLSI Layout Design Using Microwind: Part 1 | Groolo Microwind Tutorials 7. Try this out. and want to interconnect (they are not connected by default) click on this and then on the layers. We will take and example of inverter and see how best we can design it. am resizing the right edge of the polysilicon. To scroll around the layout. Hint: It is recommended to perform the DRC after laying each and every layer. It happens. Hint: After connecting two layer. As the name indicates. You will get erroneous results if they fail to connect properly. This helps you to debug the circuit easily. To get it back. We shall learn various menu items in that. If you want to view the layout in detail. 8. so don’t worry) Run Simulation: Click this when you are done. use these arrows. If you know the design rule. Zoom out. (You will not be using it initially. 12. 19. (I don’t know why).GIF] This gives 3-D view of the layout. See All. 10. Also try to use as less amount of diffusions or silicon as possible. devices. It check various design rules and suggest corrections if the rules are violated. it prevents unwanted capacitance and resistance Add text. Show Palette. it shows the 2-Dimensionla view of the selected area. 11.html 5/7 . say polysilicon and metal. Sometimes. Not only that.me/2009/08/hello-in-this-small-lab-tutorial-series. with a contact. hints tips and cheats . You can see the rectangle in green. com/2009/08/microwind-tutorialpart-2-design-of. 2010 at 12:51 AM This comment has been removed by the author. Groolo.9/30/13 Basic VLSI Layout Design Using Microwind: Part 1 | Groolo Microwind Tutorials Click here for Microwind Tutorial Part 2: Design of an Inverter [http://twitli. 2010 at 2:50 PM Thanks! Reply ran_hyd April 26. How to use Microwind. Reply www. Learn. 2013 at 11:23 PM Thanks for the great explanation.html] Posted 23rd August 2009 by Taha M Asadullah Labels: Microwind Basic Tutorial. VLSI basic tutorial 5 View comments Anonymous April 8. 2012 at 9:58 PM good! Reply Shariq August 11. VLSI design basics. VTU VLSI lab tutorial and experiments. 2011 at 6:45 AM Thank you!! Reply Unknown March 16. Groolo at SDM. VLSI lab.html 6/7 . VLSI design. Basic VSLI tool.microwind.blogspot.me/2009/08/hello-in-this-small-lab-tutorial-series. Reply Anonymous December 1. me/2009/08/hello-in-this-small-lab-tutorial-series..9/30/13 Basic VLSI Layout Design Using Microwind: Part 1 | Groolo Microwind Tutorials Enter your comment.siartdesign. Comment as: Google Account Publish Preview PCB Design Service www.html 7/7 ..com First Pass Sucess in PCB design High Speed Digital & Analog Design www.microwind.
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