LAB 3

previous lab | lab schedule | next lab

Use your ETS-7000 logic trainers for these activities....

Finish any unfinished activities from Lab 2 first.

1. Test of Octal TRI-STATE Buffers/Line Drivers/Line Receivers 74LS244 --
• Wire DATA SWITCHES to input of 74LS244 gates. Use PULSE SWITCHES to enable outputs. Each PULSE SWITCH is used to enable a bank of 4 gates. Wire LED DISPLAY to output of 74LS244.
• Show your instructor.


2. Static test of Atmel 28C64B EPROM --
• Pupose of this test is to retrieve commands/data from the EEPROM at specific points in memory.
• Verify the program entered into the EEPROM in an earlier lab using switches and lights on your trainer board. Wire the low 4 address lines (A0:A3) to the corresponding DATA SWITCHES. Wire the A4:A11 address lines to ground. Wire the 8 data lines to the LED DISPLAY on the trainer board. Figure out what to do with pins 1, 2, 20, 22, and 27 of the EEPROM by reading the datasheet. Verify the first 10 locations of the EEPROM. Open the SUPERPRO buffer to verify the machine code is correct. (Don't forget to power the EEPROM -- Vcc is +5V and Vss is ground.) Leave circuit together for next step.


3. Test of TIL 311 displays --
• Pupose of this test is display hex commands and data retrieved from the EEPROM.
• Wire up both TIL 311 displays to the 28C64B. Wire the TIL data latch inputs to the data lines of the 28C64B. Wire the LATCH STROBE to a PULSE SWITCH. Figure out what to do with the blanking input. Test that you can cause the TIL displays to display the program in the EEPROM.
• NOTE: The wiring diagram on the datasheet is a BOTTOM VIEW -- CAREFUL.
• ALSO, DO NOT WIRE UP THE LEFT OR RIGHT DECIMAL POINT (pins 4 and 10) -- If you want to learn about the decimal points ask your instructor.


4. Test of Octal D-Type Flip Flop 74LS374 --
• Wire DATA SWITCHES to inputs of the 8 flip-flops. Wire the eight outputs to the LED DISPLAY on the trainer board. Use PULSE SWITCHES to drive latch and output enable. Test the concept of latching data.


5. Test of Crystal Clock --
• Wire up the crystal clock according to the datasheet. Again, being aware of the orientation of the pinout.
• Call Lab Instructor or TA over and show them the frequency of the clock using the measure function of the oscilloscope.

NOTE: Tool box check at the end of next lab. Must pass check before receiving new set of parts