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SCHEMATICS README This file describes the enhancements and modifications for the 5.1 release of the Design Center - System 3 with schematic capture. The information provided in this file is extracted from the Genesis User's Guide. Any information which did not make it into the 5.1 version of the Genesis User's Guide is included in this file as well. 1.0) GENERAL MODIFICATIONS 1. When one or more of the MicroSim Design Center Windows programs is run a program called the Design Manager is automatically run also. You will see its icon in the lower left corner of the screen. This program is a background task that provides file and message coordination between the various MicroSim programs. If you restore the Design Manager icon to a window you will notice that it keeps a list of all the other MicroSim programs running and the files they are using. The Design Manager will automatically quit when there are no other MicroSim programs running. You should not try to delete or otherwise manipulate the Design Manager, since it is necessary for the proper execution of the other MicroSim programs and provides no functionality to the user. 2. You can specify the commands used to invoke PSpice and Probe by editing the PSPICECMD= PROBECMD= lines in the [SCHEMATICS] section of your "msim.ini" file. 2.0) NEW FEATURES 1. The marker interface feature allows you to place one or more markers on your schematic and view the corresponding analog or digital waveform associated with the marked wire, pin, or device using Probe. The Markers Menu provides commands which allow you to place and manipulate special objects called "markers." After a schematic is simulated and the Probe waveform analyzer is invoked, markers enable you to visually indicate points on the schematic where you wish to see voltages, currents, and digital signals shown in Probe. Information regarding the newly added Markers Menu can be found in the Genesis User's Guide, Chapter Five, Section 5.3.8. The following commands allow you to place one or more markers on the current page of the schematic. If Probe is running and the schematic is current, Probe will be updated to show the specified waveform as each marker is placed. Mark Voltage/Level Mark Voltage Differential Mark Current Into Pin Clear All Show All Show Selected 2. Auto-run Probe has been added to the Analysis Menu. This allows you to specify whether or not Probe is to be run automatically after the simulation has been successfully completed. 3.0) KNOWN PROBLEMS 1. To change the default title block symbol, you will need to directly change the "msim.ini" file. The Title Block menu item in the Configuration Menu will not save a newly named title block. The functionality of the dialog box is not yet implemented. Instead, use Notepad or any text editor, to change the default value in the TITLEBLOCKSYM item from "titleblk" to the name of your title block symbol. Remove the TITLEBLOCKSYM line entirely if you do not wish a title block to be automatically added to new pages. 2. You must first initialize the printer by selecting Printer Setup under the File Menu after you have installed Schematics. After this is done, Schematics will remember the printer setup and any further changes made to it. 3. Arcs do not draw properly on HP plotters (this is a problem with the driver - HP may have a newer version available). 4. Changing pin names on symbols used in schematic files may cause problems when attempting to read in the schematic. 4.0) SYMBOL LIBRARIES Table 6 on page 33 of the Genesis User's Guide provides a list of all the symbol libraries included in the 5.1 release of the Design Center - System 3. The following symbol libraries are missing from the list on page 3: burr_brn.slb - operational amplifiers dig_ecl.slb - 10K and 100K ECL parts opto.slb - optocouplers misc.slb - voltage controlled cap, resistor, inductor, admittance, 555 timers special.slb - simulation psuedo-devices (IC, NODESET, etc.) swit_rav.slb - switch mode power supply models swit_reg.slb - switch mode power supply models thyristr.slb - SCR's and Triacs xtal.slb - quartz crystals The following symbol libraries listed below are new for the 5.1 release: dig_pal.slb - Programmable array logic devices dig_gal.slb - Generic array logic devices europe.slb - European bipolar, power bipolar and diode devices marker.slb - Probe markers 4.1) SYMBOL LIBRARY CHANGES A number of symbols have been modified in order to correct certain problems. These modifications have resulted in changes to pin names, pin locations, and/or part size. Schematic drawings using these parts will need to be updated when using the modified symbols. Pin name changes are handled automatically. Other changes will require some action on your part. For any parts whose pin names have changed, Schematics will automatically replace the "old" instances (i.e. what you had originally placed on your schematic) with the "new" ones. You will get some messages when you read in your schematic (File/ Open): [8009] Invalid connection(s) during readin: You can then select Analysis/Current Errors to see which pin names on which devices have changed: Pin not found: pin 3 on symbol ua741 Invalid connection(s) during readin: [p.1] deleting junction @ [230,160] . . . Reconnecting due to possible pinname change(s): U1 The part is automatically disconnected and reconnected for you. No further action is necessary. For those parts whose size and/or pin locations have changed, you will need to delete and then undelete each part, and rewire (in most cases) to re-establish connectivity. This is accomplished using the following steps: 1) Click on the part to select it 2) Edit/Cut to delete (or strike the Delete key on your keyboard) 3) Edit/Undelete to undelete (or use the Ctrl-U accelerator key). 4) Draw/Rewire and click on the wire segment to rewire to the pin or 4) Click on the hanging wire to select it 5) Edit/Cut to delete (or strike the Delete key on your keyboard) 6) Draw/Wire to reconnect the wire 4.1.1) PIN NAME CHANGES In all symbol libraries containing 5-, 6-, and 7-terminal opamps, the names of the + and - power supply pins have been changed to V+ and V- (from 3 and 4, originally). Pin names on the T device ("analog.slb") were changed from 1,2,3,4 to A+, A-, B+, B-. In "dig_1.slb," the 85 part has pins whose names were changed from A<B_OUT, A>B_OUT, and A=B_OUT to A<B, A>B, and A=B. All parts which reference this base part will also be affected; for example, the 7485, 54L85, 74LS85, and 74S85. 4.1.2) SYMBOL SIZE/PIN LOCATION CHANGES In "abm.slb," the sizes of all of the symbols have changed, and hence most of the pin locations also. The part names are EFREQ, ELAPLACE, EMULT, ESUM, ETABLE, EVALUE, and the Gxxx equivalents. In the digital symbol libraries, the following parts have changed size and/or pin location(s): DIG_1.SLB - 148, 150, 157, 158 DIG_2.SLB - 175, 190 DIG_3.SLB - 299, 576 DIG_4.SLB - 757, 842, 874 Keep in mind that since these are all base parts, any parts which reference these (by way of the AKO mechanism) will also be affected, hence requiring you to delete, undelete, and rewire each such part. 4.1.3) MISCELLANEOUS CHANGES TO SYMBOL LIBRARIES Several parts have been removed from "analog.slb": D, D3, DCR, DVV, DZ, GAASFETD, GAASFETE, MOSD, MOSE, NJD, NJE, NMOSD, NMOSE, PJD, PJE, PMOSD, PMOSE, QNPN, QPNP, S, SCR, TRIAC, W, XTAL. These parts all require an associated model name, and hence are mostly represented in "breakout.slb," where such parts are kept. The table below indicates which breakout part should be used in place of the "old" part (that used to be in "analog.slb"): Old New --- --- D, DCR, DVV, DZ Dbreak D3 D3break GAASFETD, GAASFETE Bbreak MOSD,MOSE --- NJD, NJE JbreakN NMOSD, NMOSE MbreakN, MbreakN3, MbreakN4 PJD, PJE JbreakP PMOSD, PMOSE MbreakP, MbreakP3, MbreakP4 QNPN QbreakN, QbreakN3, QbreakN4 QPNP QbreakP, QbreakP3, QbreakP4 S Sbreak SCR, TRIAC (see THYRISTR.SLB for parts) W Wbreak XTAL (see XTAL.SLB for parts) The YX and ZX parts have been moved from "analog.slb" into "misc.slb." In "analog.slb," MAGNETIC has been superseded by Xfrm_Linear. There is also a nonlinear equivalent in "breakout.slb" (Xfrm_Nonlinear), since this symbol requires an associated model name. 4.2) EUROPEAN SYMBOLS AND COMPONENTS The symbol library "europe.slb" contains definitions for a number of European-made devices (diodes, small-signal transistors, and power transistors). The corresponding model/ subcircuit definitions for PSpice are contained in model library "europe.lib." Note that some of the symbols in "europe.slb" have names identical to some of the symbols in "diode.slb." In order for Schematics to find the correct symbol definition, you must ensure that the appropriate library is specified first in the [SCHEMATICS LIBS] section of "msim.ini." If "europe.slb" is specified before another symbol library containing duplicate names, none of the duplicate devices in the second library will be accessible. Therefore, since D1N4148 and D1N4149 exist in both "europe.slb" and "diode.slb," Schematics would take both the D1N4148 and D1N4149 symbol definitions from "europe.slb" if it is listed before "diode.slb" in the [SCHEMATICS LIBS] section of "msim.ini." You should ensure that the order of model libraries specified for PSpice in NOM.LIB reflects the order of symbol libraries specified in "msim.ini." 5.0) CREATING NEW PARTS/SYMBOLS If the part you want is not in our library, and you do not have a model or subcircuit definition of the part, then one will need to be created. You can 1. create the definition "manually" if you know, or can generate, the appropriate SPICE model parameters which characterize your device (sometimes this can be accomplished by simply copying the .model statement of a device which closely resembles the one you would like to add and editing its parameters appropriately), or you can 2. use our Parts program to automatically create the model/subcircuit definition for you, or 3. contact the part manufacturer and request the SPICE model for the part. 5.1) EXAMPLE 1: CREATING A SYMBOL FOR A NEW MODEL For this example, let's say you have saved your .model or .suckt statement in a model library called "mydiodes.lib." Note that model libary files are different from symbol library files. Model library files typically have .LIB extensions and contain .model and/or .subckt definitions of devices; whereas symbol library files typically have .SLB extensions and contain graphical representations of devices. Once you have a model/subcircuit definition for your part, you will need to create a symbol which will represent your part on a schematic. You can use the Symbol Editor within Schematics either to create an entirely new symbol, or to reference another symbol as an AKO ("A Kind Of") part. If you want to create a symbol for a new diode model that you have added, you could simply copy the "d" symbol from "diode.slb" into your <new> symbol library, and modify its PART attribute to reflect the name of the diode you have added. The steps to accomplish this are enumerated below. 1. File/Edit Library (to invoke the Symbol Editor in Schematics). Note that when you first enter the Symbol Editor, your library will be <new> and your part will be <new>, as indicated in the title bar: <new>:<new>. 2. Part/Copy (New=D1NXXXX; Existing=d from "diode.slb") Click on the Select Lib button; double click on DIODE.SLB Click on d in part selection box (near bottom) Click in the New Part Name field and enter D1NXXXX Click on OK to complete the dialog 3. Part/Attributes (edit the PART attribute to be D1NXXXX) Click on the PART attribute and change its value to D1NXXXX Click on the Save Attr button to save changes Click on OK to complete change attribute session 4. Part/Save (to save the edits locally - optional step) 5. File/Save (you will be prompted for a name, type: mydiodes.slb) 5.2) EXAMPLE 2: CREATING A SYMBOL BY DEFINING AN "AKO" PART You can also copy "d" from "diode.slb" into your <new> symbol library and create a new part which is defined as "A Kind Of" (AKO) d. The steps to accomplish this are enumerated below. 1. File/Edit Library (to invoke the Symbol Editor in Schematics) 2. Part/Copy (New=d; Existing=d from "diode.slb") Click on the Select Lib button; double click on DIODE.SLB Click once on d in part selection box (near bottom) Click in the New Part Name field and enter d Click on OK to complete the dialog 3. Part/Save (to save the edits locally - optional step) 4. File/Save (you will be prompted for a name, type: mydiodes.slb) 5. Part/New Description: diode Part Name: D1NXXXX AKO Name: d Click on OK to complete the dialog 6. Part/Attributes (edit the PART attribute to be D1NXXXX) Click on the PART attribute and change its value to D1NXXXX Click on the Save Attr button to save changes Click on OK to complete change attribute session 7. Part/Save (to save the edits locally - optional step) 8. File/Save 5.3) SETTING UP LIBRARY PATHS Once you have both the model/subcircuit definition, and the symbol, for your new part, you will need to tell Schematics where to find the appropriate libraries. Schematics expects to find the symbol libraries in LIBPATH (as specified in the [SCHEMATICS] section of "msim.ini"). The symbol libraries that will get loaded into the schematic editor are listed in the [SCHEMATICS LIBS] section of "msim.ini" in numerical order. LIB1=abm.slb . . . LIB31=xtal.slb You will need to add your newly-created symbol library, "mydiodes.slb," to this list such that: LIB32=mydiodes.slb Then, the next time you invoke Schematics, "mydiodes.slb" will load along with the other symbol libraries. This will enable you to select Draw/Get New Part within Schematics and specify D1NXXXX as the part you would like to get. Assuming you saved the .model definition of your diode in a model library file called "mydiodes.lib," you now need a way to tell Schematics where to find this model library file. One way to do this is to simply edit the [SCHEMATICS NETLIST] section of "msim.ini" to include a line which refers to "mydiodes.lib": LINE1=.lib LINE2=.lib "mydiodes.lib" Keep in mind that, before invoking Schematics, you must set the PSPICELIB environment variable to indicate the directory path containing all of your PSpice model libraries. Additionally, you can indicate the path explicitly in "msim.ini": LINE2=.lib "c:\msim\lib\mydiodes.lib" (PC) LINE2=.lib "/home/pspice/sun4/lib/mydiodes.lib" (Sun) There are two other ways to indicate the existence and/or location of a model library file (in this case, "mydiodes.lib"). One is to place a LIB symbol (Draw/Get New Part... LIB) somewhere on your schematic, and edit its FILENAME attribute to be MYDIODES.LIB. The other is to place an INCLUDE symbol (Draw/Get New Part... INCLUDE) somewhere on your schematic, and edit its FILENAME attribute to be MYDIODES.LIB. Using the INCLUDE symbol causes the netlist simply to include the contents of the specified file (in this case, "mydiodes.lib") in the simulation circuit file. Using the LIB symbol causes the simulator to treat the specified file as a library and, hence, create an index file for this library. If any changes are made to this library file, then a new index file will be generated automatically. Depending on the size of the library file, this could take a while. The simulator uses the index file to find parts quickly, and improves the speed of your simulation. However, if you change the library often, it might be more efficient to use the INCLUDE symbol. Having done all this, you can now invoke Schematics, place a D1NXXXX on your schematic (since Schematics now loads "mydiodes.slb"), and run a simulation (since you have indicated the directory path where "mydiodes.lib" can be found). 6.0) SYMBOL EDITOR TUTORIAL A Symbol Editor tutorial has been added to the Genesis User's Guide to assist you in using the Symbol Editor. Both the Symbol Editor and the Schematic Editor tutorials can be found in Chapter Four. 7.0) PRINTER SETUP Printer setup information is recorded in the "msim.ini" file for use by Schematics. If you wish to make hard copies, you must set up the printer by invoking File/Printer Setup from within Schematics. Choosing Printer Setup from the Windows control panel or elsewhere will not set it up for use by Schematics. 8.0) USING THE 'STMED' PROGRAM WITH 'SCHEMATICS' The Stimulus Editor (StmEd) is a DOS program which allows you to quickly set up and verify the input waveforms for a transient analysis. You can create/edit voltage sources, current sources and digital stimuli for your circuit. Using StmEd is an ALTERNATIVE to placing source parts such as VSRC on the schematic and editing the attributes that define the transient specification. StmEd will produce a file containing the sources with their transient specifications. Since StmEd is not yet fully integrated with the Schematic Editor, there are some special steps you must follow in order to use it with Schematics: Within 'SCHEMATICS': 1) Connect a global port to the node(s) where the source is to be connected. . Choose Get Part from the Draw Menu . Enter GLOBAL for the part name . Click OK . Place one or more on the page 2) Label each global port. These labels will serve as node names, specified in StmEd, to which the source is to be connected. . Select the port . Choose Label from the Edit Menu . Enter a name . Click OK 3) Place an INCLUDE part on your schematic. The stimulus specfications you will be creating in StmEd will be written to a file which will be included in your circuit file by this mechanism. You will only need one of these per schematic, independent of the number of sources you will be creating in StmEd. . Choose Get Part from the Draw Menu . Enter INCLUDE for the part name . Click OK . Place the INCLUDE symbol on the page 4) Change the FILENAME attribute of the INCLUDE part to indicate the name of the file which will contain your stimulus specifications. We suggest you name the file "<schematic name>.stm." Prefix it with the directory in which the schematic is being created: "c:\msim\mycir.stm." . Select the INCLUDE part . Choose Attributes from the Edit Menu . Select the FILENAME attribute . Click the CHANGE button . Enter the filename . Click OK to end the Change Attribute dialog . Click OK to return to the schematic Within the Stimulus Editor: 1) When prompted for a file name, enter the file name used in Step 4 above. 2) Create one or more stimuli to be used in your schematic. For each stimulus, a) name it whatever you want, making sure the first letter is one of (V,I,U), depending on the type of source you are creating. b) provide the transient specification as prompted. c) change the connections to the stimulus device to match the name of the global ports in the schematic where the stimulus is to be connected: . Choose Other_info before exiting the Modify_stimulus menu . Choose nOdes (or Output_nodes for digital) . Change the node names to match the labels of the corresponding global ports to which they are to be connected. If connected to ground, use "0". 3) Save the session by exiting StmEd.