Symbol library

The title block contains information about you, your company, and the schematic. We will be using the title block to identify the student, class, and university where the schematic was created. There are four ways we can modify the title block. The first way shows how to change the title block for the current schematic. This method must be repeated each time you create a new schematic. The second way shows you how to tell Capture information about yourself that is used in every schematic you create. This could be information such as your name, company, address, and phone number. The third method shows how to select a different title block from a list of available title blocks already created. The fourth method is to create a new title block and save it in a symbol library. 

When you use the BfOWSe button, the Pelt library field is filled in automatically. A part library is also referred to as a symbol library and has an. olb extension. By default, Capture uses the same name you specified for the NetllSt file as for... 

The last thing we need to do is configure Capture and PSpice to use the subcircuit and symbol libraries we created. Create a new blank project ... 

Since we placed the new symbol library in the default library directory, our new library is easily found. Select the USER SUBCIRCUfTS.OLB library and click the Open button ... 

The library is added to the list of libraries. All projects can now use this symbol library. If we select a part in this library, it should be displayed in the dialog box ... 

So far, we have only configured the symbol library. If we use this symbol in a circuit and attempt to simulate it, PSpice will generate an error stating that it cannot find the model for this part. Thus, the next thing we will do is configure... 

You can scroll through the list if you like. Hundreds of capacitors are contained in this list. To select a part, click the LEFT mouse button on the line in the database you want to select. If the line is highlighted in green, then the part is correctly linked to a graphic symbol in one of the symbol libraries. If a symbol and PCB layout footprint are found, they will be displayed in separate windows ... 

Large databases of PFDs that can be consulted to learn about specific processes. In addition, some commercial versions of computer-aided design (CAD) have ready-to-use embedded symbol libraries. 

DC follows the paths in the search path variable from left to right. For example, if in a linkjibrary file, link.db exists in the lib directory and in the vhdl directory, then the link.db file found in the lib directory is used. If the libraries are assigned correctly and the search path indicates the location of these files, on invoking DA, the Setup -> Default pull-down menu should indicate the specified target, link and symbol libraries. 

Target Library, Link Library, and Symbol Library... 

The technology and symbol libraries must exactly match in case for the cell names and their pin names. In other words, if the pin names of the IVA cell in the technology library do not match the pin names of the cell IVA in the symbol library, the tool will not be able to use the IVA symbol. In such a scenario, the tool uses symbols from the synopsys default generic library. The comparejib command in DC, is a fast check mechanism to determine any differences between the symbol library and the technology library that might exist. 

Symbol libraries are created from. slib files. 

Ensure that the mbol library (.sdb file extension) for the technology library is available and specified by the symboijibrary variable. Also, verify that the search path variable in your. synopsys dc.setup file includes the path to where the symbol library file is located. After doing the above, execute the following steps to verify ... 

If DA still shows boxes instead of symbols, it is likely that the symbol library and the technology library do not match in case for the pin names or cell names. Execute the comparejib command to verify the same as shown in sectionl.2.3. 

It is possible to generate a Symbol library in EDIF format from most EDA tools. From DC, one can write out EDIF of a symbol library. Similarly, one can read in an EDIF file of a symbol library and create a Synopsys symbol library (.sdb) file. 

To transfer a design from DC to another EDA vendor tool via EDIF schematics, all the symbols used in the schematic must be from the ASIC vendor symbol library and not from the generic.sldb, the Synopsys generic symbol library. It is important to remember that a symbol library in system A is not the same as a symbol library in system B even if the cell names and interfaces match. Therefore, when dealing with schematic problems, the important issues to know are as follows ... 

What pin-spacing does the target-system use and what scale does the original symbol library have ... 

This error message occurs when writing out EDIF schematics if some of the cells used in the design are from the generic.sdb symbol library. DC automatically substitutes cells from this library if they are not available in the vendor s symbol library. The scales used in the generic symbol library and the vendor library are almost always different. One must determine which cells from the generic library are being used and ensure that symbols for those cells are available in the vendor symbol library. 

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