Lesson 5: Creating Heterogeneous Parts

Transcription

1 Lesson 5: Creating Heterogeneous Parts Lesson Objectives After you complete this lesson you will be able to: Create a Heterogeneous part Annotate a Heterogeneous part (Optional) Heterogeneous Parts A heterogeneous part is a part that has two or more unique part graphics or pin count. It could have a different number of pins in each gate or part. Any part with a pin common to all the other gates must also be defined as a Heterogeneous part. The following part displays each gate with a different number of pins in the gates as Power & GND are displayed on only the first gate. EMA Design Automation 131

2 A heterogeneous part must be defined as multi-section (Parts per Pkg is set to two or more). Each part graphic represents a different portion of the entire package. For example, an OPAMP may have 4 gates but only the first gate contains the Power and/or Ground pins. You define this heterogeneous part as having four parts per package. In the Part Editor, use the View - Next Part command to create three unique part graphics, as shown in the previous graphic. Annotating Heterogeneous Parts When a heterogeneous part is used in a design, OrCAD Capture needs a property to indicate which part graphics go together in a package. This is required for Heterogeneous parts only when you use the Annotate command. EMA Design Automation 132

3 Lab 5-1: Creating a Heterogeneous Part - LM342 Lesson Objectives After you complete this lab you will be able to: Create an heterogeneous part Understand how to Annotate 1. If a library is not still open in OrCAD Capture, select and open the TRNG.OLB library you were working with. 2. Highlight the library name and from the right-mouse button pop-up menu select New Part. 3. Enter the information as shown above. 4. Click OK. EMA Design Automation 133

4 Creating the Symbol for the first gate 1. Set your window to full, then select View - Zoom - All (or click the button in the toolbar) to adjust the view. 2. Using the Place Polyline command (see the Toolbar); draw some triangular graphic as shown in the next image. So that the Power and Gnd pins will eventually fall on a grid, use a 4X5 grid. Remember to use the Shift key while drawing in order to angle the poly-line. Adding Pins for the first gate 1. Click the Place - Pin button. 2. Enter the information shown in the following picture, then click OK. EMA Design Automation 134

5 3. The pin image appears, attached to the cursor. Position it as shown in the following picture, and click to place it. 4. Continue to add pins to achieve the follow image. Next pin: Name ( - ) Next pin: Name ( OUT ) Number ( 2 ) Number ( 1 ) Type ( Input ) Type ( Output ) EMA Design Automation 135

6 5. Use the line graphics command to draw a short stub from the edge of the triangle graphics to the edge of the bounding box. See the following graphics. 6. Make sure you turn off Snap to grid to do this. Turn it back on when you finish. Place the Power pins 1. Select Place - Pin. 2. Enter the information shown in the following picture, then click OK. Use the pin shape (Zero Length) and place it at the end of the line graphics you used to draw the pin stub from the triangle graphics. EMA Design Automation 136

7 3. Place the V+ Power pin at the top edge of the bounding box. 4. Place the V- Power pin at the bottom edge of the bounding box. 5. Select Options - Part Properties. The User Properties dialog box reappears. 6. Select the Pin Names Visible option, then toggle the value to False, as shown in the following graphic EMA Design Automation 137

8 7. Click OK. 8. Repeat the previous steps (5 & 6) and make the Pin Names visible again. 9. Select Options - Part Properties, and add a GROUP property to the part. Leave the Value field blank and use the Display button in the User Properties form to make the property visible. The part should look like the following picture. EMA Design Automation 138

9 10. Select File - Save. Creating the Symbol for Section Two, Three, and Four 1. Select View - Next Part. 2. Using the skills you learned above, create the next sections in the package. What makes this section unique from section one is that the next 3 gates do not have the PWR/GND pins shown. Please refer to the following diagram for the pin names and numbers in the other gates. Gate B Gate C Gate D + = 5 + = 10 + = 12 - = 6 - = 9 - = 13 OUT = 7 OUT = 8 OUT = Close and Save the library part. 4. File - Close the library. EMA Design Automation 139

10 Lab 5-2: Annotate the LM324 Part (Optional) The following lab is only for testing your Heterogeneous Parts using the Annotate command. 1. Select File - New Design. (As this is only to illustrate how to annotate your Heterogeneous parts, we will not use the formal settings for an.opj file.) 2. Make sure you are in the D - EMA_Training -Capture directory for this exercise. 3. When the page is open add the following gates to the page. 4. Select Place - Part. 5. When the Place - Part tab opens, add the TRNG.OLB to the search path. 6. Now select the LM324 part from the TRNG.OLB library, as shown below: EMA Design Automation 140

11 Notice that the Packaging section of the Place Part form shows four parts per package. The Part field defaults to A, or section one of the package. 7. Place the part on the schematic page. 8. Add three more sections of the LM324 package into the schematic by toggling the Part field in the Place Part form to B, C, & D. 9. Repeat this until you have about 8 or 10 different gates on the page. Remember you can use COPY/PASTE to achieve some of this. 10. The page may look something like the following picture. It is not important how many of each gate type is placed. 11. Select four gates, one of them being an A gate. The squares and circles were added to the picture to show which gates were grouped together in the example. EMA Design Automation 141

12 12. Click right and select Edit Properties from the pop-up menu. 13. In the Property Editor window, select the New Row or New Column button in the top-left of the Property Editor window. 14. Enter the new GROUP property. 15. Now select the GROUP row and from the RMB popup menu select Edit. Set the GROUP property value to 1 for the row. Refer to the following illustration to see how this can be done. 16. Click Apply and close the Property Editor. 17. Repeat this process until you have assigned all the gates to groups. 18. Now, in the Project Manager window, highlight the design name. 19. Select Tools - Annotate. 20. Under Physical Packaging, add the GROUP property to the end of the Combined Property String. 21. Be sure to enclose the property name in curly braces, as shown in the following graphic. EMA Design Automation 142

13 22. Click OK. 23. Check the schematic to see if the sections of the LM324 parts were placed into the same package (same reference designator). EMA Design Automation 143

14 24. Close the test schematic but do not save it. If the GROUP property had not been added to the Combined Property String, it would have been ignored during annotation, resulting in two separate LM324 packages. To pin swap in the OrCAD and Allegro PCB Editor, the SPLIT property must be added to all sections of a heterogeneous part. Give the SPLIT property a value of TRUE. There must not be any duplicate pins across the sections of the split part. 25. When you are done testing the part, exit the design but do not save it. EMA Design Automation 144