Digital Schematic Creation

To create a digital schematic such as the one shown in figure 2 follow the steps outlined below:

1. start da on a new schematic da -schematic digital_design (Choose your own name)
2. select the generic digital parts library:
   1. select Palette Menu item Library
   2. select the library gen_lib
   3. select the part nand2
3. place the part on the schematic by clicking the left mouse button
4. place three more parts by positioning the mouse and pressing the f5 function key
5. choose the portin part and place two instances
6. choose the portout part and place one instance
7. connect the parts as follows:
   1. enter the palette menu pop-up and choose the Display Schematic Palette item
   2. select the Add Wire palette option
   3. click the left mouse button at the starting point of a wire
   4. click the left mouse button at the end point of each segment of the wire
   5. double click the left mouse button at the end of the wire
8. label the ports
   1. place the mouse cursor over the text on the port
   2. press the shift-F7 key
   3. place the mouse cursor over the value field of the pop-up menu
   4. type in the new name
9. repeat for the other ports
10. check the schematic by typing check
11. close the Check window by double clicking the bar in the upper left corner of the frame
12. save the schematic by selecting the File --> Save Sheet --> Default Registration item from the menu bar.
13. create a symbol for the schematic
    1. chose the Miscellaneous --> Create Symbol... item from the menu bar
    2. if you want pins in alphabetic order click on the yes button next to the sort pins? item
    3. choose OK on the pop-up form. A new window for the symbol editor will be created with a box symbol. Input pins are on the left side, output pins are on the right side and i/o pins are on the top of the symbol.
    4. name the symbol
       1. select the symbol body (the box)
       2. enter the edit window pop-up and select the Properties --> Add --> Add Single Property... item
       3. choose the COMP item on the Existing Property Names list of the pop-up form
       4. enter a name in the Property Value field
       5. select OK on the pop-up form
       6. click the left mouse button at the location for the name
    5. check the symbol by selecting Check --> With Defaults from the menu bar. Ignore the warnings about pin names not on the interface
    6. save the symbol by selecting File --> Save Symbol --> Default Registration from the menu bar.
    7. user created symbols are placed on schematics from the Choose Symbol item on the schematic editor palette menu

 
Figure 2: Simple digital design