User Manual
Contents
1. grid size This dialog is shown on Figure 3 The minimum size of the grid that you can set is 11x11 The maximum grid size depends on the maximum image size that your computer can handle This depends on the amount of physical memory RAM installed on your computer Above applies to zooming as well For example you might be able to view large grids but you won t be able to zoom in on them Therefore the maximum grid size can be set at maximum zoom out which is 50 Note that you won t be able to reduce the grid size if current circuit model does not fit into it In this case ReTrO will terminate the command and notify you through dialog warning screen 4 1 4 Run Run pull down menu consist of six commands for controlling circuit model simulations e Run continuously simulates current circuit model in time increments e Pause pauses continuous simulation e Stop stops simulation e Step executes single simulation cycles e Time Step execute simulation in time increments e Simulation Properties shows the dialog that allows you to change simulation properties This dialog is shown on Figure 4 ReTrO simulates circuits in cycles which evaluate the state of the circuit when events occur A time step evaluates these simulation cycles in time increments of simulation time During circuit simulation the simulation time is shown on the Status Bar Properties x Simulation Properties Data Flo2. User Manual Table of content 2 SYSTEM REQUIREMENTS oiloei onas aa aa e a ae aaa aaea e aE I aS EAR TING UP sirepna T aa e E aapa eaaa Eaua 4 1 1 E Cee ene eae nen eee E T Dd PVC ea A chon et nat nee A a a A chon tenkca stan AA Ns SIU asectec cts sarteestasestiec A es ntadaaleciest nae eushist saset dines tae ea eda aetadans A Dd CGI Geer tse tart sstasu A a bes atdanleciast nae echt sasek danas tae ea aie dactt aatadans Rot caakca sesenteaon cestenabaaeie c a BS A A Re OE CLO eT SERA TRE eR IRE ORM Te ICTR eR AA ee A ee Re eee Ree e eee weer a dala As ERE REO REPRO CRT ORIN STR T TE OP RET TOR TCT ET emt TT een IRC TT Or Rea ee Ter es heme Treen setts Orme er reer er rear rier ere A OR TC Wie AIR as estes ci seer ea tae Mat ek te ees te eee es ee ae aera AOS C OMPONENIBAR yesaraits tenes aes ncia tans eae a E T ane eas 4 3 1 Adding wires and buses tO circuit ccceccccccccecccueecceeen esse aeeee seca eeeeaeeeaeesea esses eeae esses esaaeseaeeaaes 4 3 2 Adding components to CIV CUIL cccceccccscccavcccnuscnseccauscuneccausccanscaeccenscesecsausesaeceausesauseseecausenses doS LAE CCU RCO RTT SOREL T ORIOL Te OTC a TON RET TT eee TCT nT STMT Serene TON ser tree ert ter Sem e ee rT ne 1 Terms This manual will use following terms Click press and release left mouse button Double click rapidly click left mouse button twice e Right click press and release mouse button Move mouse move cursor on screen using
3. anges made to the current circuit model after the last save command will be lost Current version of ReTrO does not warn you about this so you should make sure that you save all changes before loading a new circuit or exiting ReTrO 4 1 2 Edit Edit pull down menu consist of seven commands for manipulate selected components e Delete removes selected components from current circuit model e Rotate Right rotates selected component on the grid 90 clockwise e Rotate Left rotates selected component on the grid 90 anti clockwise e Rotate to shows another pull down menu that let you choose orientation of selected component e Flip Vertical flips selected component about horizontal axis e Flip Horizontal flips selected component about vertical axis e Properties shows dialog that allows you to alter selected component s properties Note that not all components have properties and can be rotated and flipped in these cases corresponding commands will be disabled Properties x Grid Properties Size Width 50 Height 50 Figure 3 grid property dialog 4 1 3 Grid Grid pull down menu consist of three commands for adjusting grid properties e Show Grid hides shows the grid e Zoom shows another pull down menu that let you scale the grid There are totally five scaling factors that you can set 50 75 100 150 and 200 e Attributes shows the dialog that allows you to change
4. dding wires component mode to edit circuit mode To select a component on the grid just click on it Component s color will change to indicate that it was selected To select more than one component 1 Press left mouse button on top left corner of components you want to select 2 Drag mouse to bottom right corner of components you want to select 3 Release mouse button Again components color will change to indicate that they were selected 14 Delete Delete Rotate Right Rote rart Rotate Lett Patate lett Flip Wertical Alpe erica Flip Horizontal Alpe oreo Fiber ta Rotate to d Properties Show Content Properties a typical shortcut menu b shortcut menu of RAM and ROM Figure 9 components shortcut menus Once you have selected components you can edit them using commands on Menu or Shortcut bar Alternatively you can click right button of the mouse on these components to bring a component s shortcut menu as shown on Figure 9 Typically this menu will allow you to delete rotate flip or change component properties However some components shortcut menu will allow you to do more For example RAM and ROM have an extra command that allows you to view their memory content To deselect selected components just click on any empty spot of the grid 15
5. el vl dolhet Ss F eb TE Status Bar Wee ES 15 E EH te tE Ted ty LE TAP it W Edit mode Figure 1 ReTrO main window Fle Edit Grid Run Help Hew Rur About Open Paige Save stip Save Ag Step Time Step E xit Simulation Properties Delete Show grid z OOM Rotate Right i Rotate Left Attributes Rotate to d Flip vertical li Flip Horizontal Properties Figure 2 menu hierarchy 4 1 Menu Menu contains a list of commands that can be issued to ReTrO It groups these commands into five pull down menus 1 File contains commands for storing and retrieving circuit models 2 Edit contains commands to manipulate selected components 3 Grid contains commands to adjust grid properties 4 Run contains commands to control circuit model simulations 5 Help contains information about ReTrO Menu hierarchy is shown on Figure 2 4 1 1 File File pull down menu consist of five commands for storing and retrieving circuit models e New creates empty grid for circuit model with corresponding file Untitled toy e Open shows file dialog that allow you to loads circuit model from file e Save saves current circuit model to corresponding file e Save As shows file dialog that allow you to save circuit model to a new file e Exit terminates ReTrO execution Note that when you load a new circuit model from a file or terminate ReTrO execution all ch
6. mouse Drag mouse hold left mouse button and move mouse 2 System requirements This manual will describe operation of ReTrO stand alone version under Microsoft Window 95 98 However this should also be applicable to other platforms as well as to applet version of ReTrO To run Java programs under Windows 95 98 you will need Microsoft Java Virtual Machine JVM installed on your computer In particular you will need at least version 5 00 3188 of JVM to run ReTrO To find out what version of JVM is installed on your computer go to MS DOS command prompt and type jview Following text should appear on the screen Microsoft R Command line Loader for Java Version 5 00 3188 Copyright C Microsoft Corp 1996 1999 All rights reserved The version of JVM installed on your computer is indicated on top right corner If your JVM is older than 5 00 3188 or MS DOS cannot find file jview at all then you will need to update JVM on your computer ReTrO installation CD contains a JVM version 5 00 3188 To install it on your computer 1 Insert installation CD into your CD ROM 2 Go to directory resources MS JVM in the installation CD 3 Double click on icon msjavx86 exe 4 Follow instruction on the screen to complete the installation process 3 Starting up To install ReTrO on your computer 1 Insert installation CD into your CD ROM 2 Go to directory ReTrO Stand Slone Stand Slone Windows 95 in the installatio
7. n CD 3 Copy the content of this directory on to your local hard disk To start ReTrO application 1 Go to directory on your local hard disk where you copied ReTrO files 2 Double click on Retro exe 3 A splash screen will be shown while ReTrO is initializing Then the main window will appear 4 Main window ReTrO main window consist of five sections as shown on Figure 1 Menu contains list of commands that you can issue to ReTrO Shortcut Bar contains shortcut buttons to most frequently used commands in menu Component Bar contains list of components that you can add to schematic diagram of logic circuits Grid area where schematic diagram of logic circuits is created Status Bar area that indicates what ReTrO is doing All buttons on the main window have a bubble help future If you forget what the button s function is move the cursor on the screen to that button and leave it there for a moment A help bubble will appear next to that button with a brief description as shown on Figure Bubble help future is also available for pull down choices Note that when a command is not available at particular moment corresponding button and menu item will be disabled For example during simulation buttons on Component Bar will be disabled to prevent any changes to circuit model 4 HelrO Untitled toy File Edt Grid Aur Help Pe x pm a Shortcut Bar ey Help Bubble E
8. ound information on ReTrO Flip Flip Horizontally Vertically Noe x 8 B Wy cae Franz I i I 4 A 150 Rotate Rotate Left Right WOO Figure 5 shortcut bar foe ols 4 2 Shortcut bar Shortcut bar contains shortcut buttons to most frequently used commands in the Menu as shown on Figure 5 This includes commands from pull down menus e File new save open e 6 Edit delete rotate right rotate left flip horizontally flip vertically e Grid zoom show grid e Run stop run pause step time step 4 3 Component bar Component bar contains commands that allow you to create circuit models Its layout is shown on Figure 6 The circuit creation process itself consists of three parts e Adding logic devices to circuit model e Adding wires and buses to connect those components e Fditing circuit model 10 Select components Available B i CR ranp components lI ri Ts Ty H eh E H ti E i 1s Ei 1S REP Tt 1 TH Ty Th eb i Ae E i Figure 6 component bar 4 3 1 Adding wires and buses to circuit To add single bit wire to your circuit 1 Click on wire icon on component bar 2 Move mouse cursor to position on grid where the wire starts 3 Press left mouse button and drag the cursor to the end position of wire 4 Release left mouse button 11 To add bus to your circuit 1 Click on bus icon on component bar 2 Move mouse cur
9. sor to position on grid where the bus starts 3 Press left mouse button and drag the cursor to the end position of bus 4 Release left mouse button Note that you can only create a single horizontal or vertical wire bus at a time You can also change the size of the bus using choice box on the top of the component bar Clicking on this choice will bring up a pop up menu with available bus sizes as shown on Figure 6 If your desired bus size is not on the list select More option at the bottom of pop up menu This will bring up a dialog as shown on Figure 7 which will allow you to manually specify the bus size Specified bus size will then be added to the pop up menu so that next time you don t have to go through this procedure again It should be noted that manually selected bus size actually replaces bus size in the pop up menu which was not used for the longest period of time This prevents the list of available bus sizes from becoming too large Properties p Bus Pins Bus Size E Cancel Figure 7 edit bus size dialog 12 Libraries x YY Component Sets Standard Library Add Remove OF Figure 8 library manager dialog 4 3 2 Adding components to circuit To add a particular component to your circuit 1 Click on corresponding component icon from available list on component bar 2 Move mouse cursor to position on grid where you want to place a component 3 Click left mouse bu
10. tton to place a component on the grid The set of components available to you depends on the current active library which is indicated in the choice box on the top of the available components ReTrO will initially load a Standard Library at the start This library consist of basic digital components on Register Transfer Level like basic logic gates RAM ROM registers etc 13 Using the choice box on the top of the available components you can activate other component libraries Clicking on this choice will bring up a pop up menu with list of available libraries as shown on Figure 6 If your desired library is not on the list select Load Library option at the bottom of pop up menu This will bring up a dialog as shown on Figure 8 which will allow you to add and remove libraries from pop up menu so that next time you don t have to go through this procedure again To add library to ReTrO 1 Click Add button on library manager dialog 2 This will bring up a file dialog that allow you to load component library To remove library from ReTrO 1 Click on library name you wish to remove in library manager dialog 2 Click Remove button on library manager dialog to remove selected library 4 3 3 Editing circuit To edit logic circuit on the grid click on select component icon on component bar as shown on Figure 6 Alternatively you can click right button of the mouse anywhere on the grid to switch from a
11. w I Show data Fow Zero meen One E Speed Step size 0 5 Slowest 4 r Fastest OF Cancel Figure 4 simulation property dialog In simulation property dialog you can e Choose whether ReTrO should show the data flow during simulation ReTrO changes the color of single bit wires to indicate whether the data on it is True False or Undefined This can be very confusing and can slow down simulation speed if there are too many wires e Set the colors to represent True logical One and False logical Zero data on single bit wires Note that these colors must be different from each other e Set increment time for simulation e Set the speed for continuous time increment simulation mode Note that in logic circuit different components are not allowed to drive same node at the same time This also applies to different pins on the same component If ReTrO detects above situations simulation will be terminated and a warning screen will notify you about the problem To help you correct the circuit ReTrO will flash components that caused this error while warning screen is shown to you 4 1 5 Help Help pull down menu supposed to contain help facilities However time constraints imposed on the development of ReTrO did not allow the author to integrate this feature into the program At the time of writing this manual there was only one command available in the Help menu e About displays a backgr
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