1. Advanced Digital Circuits ECET 146 Week 4 Professor Iskandar Hack ET 221G, 481-5733 hack@ipfw.edu

2. This Week’s Goals Introduction to AHDL Designing a Combinational Circuit from a Truth Table using the Table Command in AHDL

3. Design Example ABCDX 00000 00010 00101 00111 01001 01010 01100 01111 10001 10010 10100 10111 11001 11010 11101 11110

4. Introduction AHDL Altera Hardware Design Language (AHDL) is a way of designing digital circuits by defining in a text format the functionality of the circuit. AHDL is NOT a programming language!!! AHDL is a concurrent language. All behavior specified in the Logic Section of a TDF is evaluated at the same time rather than sequentially. All AHDL instructions are translated into hardware, and as such commands such as a=a+1 are not supported.

5. AHDL File Format – Subdesign Spec The top part of the file contains the subdesign I/O specification. It has the name of the design followed by all of the I/O pins. Important note – the name of the subdesign (lab4b in this case) must be the same name as the file. This file must be named lab4b.tdf Do not use X as a node name – it is reserved in AHDL

6. AHDL File Format – Logic Section After the subdesign section you can name any internal nodes (not shown in this lab) After the naming internal nodes then the logic section follows denoted with a Begin and End Logic

7. AHDL Complete File

8. The Table Keyword A table is the easiest way to implement combinational logic in AHDL, you simply enter the truth table as you want it. The Table begins with the keyword TABLE Followed by a line that specifies the inputs and outputs for the table (note you can implement as many outputs as you want) The inputs and outputs are then entered in the table in the syntax shown (next slide) The table ends with the keyword END TABLE

9. Completed Table Inputs in Hex format Values from Truth Table Start of Table Inputs and Outputs of Table End of Table

10. Implementing a Design in AHDL Select New -> AHDL Design File

11. Enter Text Enter the text as shown in previous slides (note you can use any text editor if you chose not to use the Altera Text Editor)

12. Save File Note – Separate Directory with same Name as File Ext.tdf Create Project as before NOTE: The name of the project MUST be the same as the Subdesign name on the previous slide.

13. Compile and Simulate Steps (refer to earlier slides for details) Create Project Specify Part Don’t set pins yet (the system doesn’t know what your I/O pins are until the first compile, you’ll get a warning) Also note that this time I named the pins i0, i1, i2, i3 Compile the project Assign the pins as before Recompile the project Create Waveform Vector Files (see previous labs) Simulate the design

14. Simulation

15. Connect the Altera Board to the PC Check out an Altera Board from the Lab Tech office DO NOT connect any parts to the board before programming!!!! The board has the design from the last time it was used and it’s possible that some inputs now are now outputs and that you can destroy the part.

16. Connect Board to PC I When checking out board also check out DC wall pack. Ensure that the wall pack is of the correct polarity (+ is the center, - is the outside) and is between 9 and 12 volts. Also get a Male -> Female DB25 cable to connect between the computer and the PC

17. Connect to PC II Notice the location of the connectors used, the other DB25 connector is used for experiments. DB25 Cable to PC DC Power connector

18. Open the Programming Module Select the Programmer Hot Button

19. Select Programming Hardware Once the programmer is opened – hit hardware setup Then select Add Hardware Selected Byteblaster on LPT1:

20. Select Programming Options Select Program/Configure and Verify

21. Program the Part Hit the start button You should see the progress bar move and the red LED come on (on the board) during programming

22. Wire up Board Connect VCC and Ground to the proto board by using the +5 volts and Ground on the top of the board. DO NOT use the unregulated DC!!! This could be as high as +12 volts and will destroy the part. Place wires from the Input's to Ground on the proto board (this is input A=0, B=0, C=0, D=0)

23. Wire Up Board II For this Lab we’ll use positive logic (the Altera part supplies the 5 volts for the LED), so connect the LED as shown.

24. Wired Board Your board after wiring should resemble the following: Inputs Output X

25. Wire up Board Connect VCC and Ground to the proto board by using the +5 volts and Ground on the top of the board. DO NOT use the unregulated DC!!! This could be as high as +12 volts and will destroy the part. Place wires from the Input's to Ground on the proto board (this is input A=0, B=0, C=0, D=0)

26. Wire Up Board II For this Lab we’ll use positive logic (the Altera part supplies the 5 volts for the LED), so connect the LED as shown.

27. Verify the Design Move the input wires thru the 16 possible combinations (0000 to 1111) to verify that the design matches the truth table

28. Summary This week we covered how to design a circuit without drawing ANY schematics using the waveform editor We also got our first look at designing a circuit by using AHDL (also without drawing schematics) We also we reviewed how to verify a combinational logic design using the Altera hardware

29. Lab Three Design a circuit and verify it using the techniques (first using waveform design and again using AHDL) covered in this week’s lecture that will have the following truth table. Turn in your printouts from the schematic editor and simulator. Download only the project from AHDL to the board and verify it’s operation in hardware ABCDX 00001 00011 00100 00110 01001 01010 01100 01110 10000 10010 10100 10110 11000 11010 11101 11111