NAND & NOR symbols Note: This prelab has 8 parts and is worth 10 pts. NANDZ OR2B2 NOR AND2B2 NAND circuit WD- NAND JODF Task One: NAND & NOR Circuits In the 1960-70s TTL circuits were rarely built with the basic AND, OR and NOT gates. Instead these circuits were constructed with the less expensive NAND, NOR and XOR. The most famous digital logic IC of that era was the the 7400 quad 2-input NAND IC, which was developed by several manufacturers in the 1960's. The two-level NAND-NAND circuit can implement functions in SOP (sum of products) form, while the two-level NOR-NOR circuit implement functions in POS (product of sums) form. 1. Two-level NAND drcuit. a. (Pre) Symbols for the NAND and NOR gates are shown at upper right. The OR2B2 is an equivalent symbol for a NAND gate, obtained from DeMorgan's law. Redraw the two-level NAND-NAND circuit for F1 (shown at right) using one OR2B2 symbol so this circuit may be viewed in terms of basic AND and OR shapes b. (Pre) Write an expression for Fi and its truth table. C. Mount a 7400 NAND gate on the red box, and connect the inputs to 2 switches and the output to a LED. Draw an experimental truth table for the 2-input NAND. d. Show how to make an inverter (NOT gate) from a NAND gate, draw this circuit, and confirm its operation. e. Build the NAND-NAND circuit shown at right on the red box, using 7400 SSI gates, and record a truth table confirming your results. YD NANDZ ZD NAND NOR circuit WD NOR DF NOR You NOR 2. Two-level NOR circuit. a. (Pre) Repeat 1 a & 1 b for the NOR circuit above, using the AND2B2 symbol, to redraw the NOR-NOR circuit into an equivalent form. b. Swap the 7400 chip for a 7402 IC. (Mount it upside down to reverse the direction of the gates. Also exchange Power with Ground). Record a truth table for one of the 2-input NOR gates on the red box. c. Finally, build the NOR-NOR circuit and verify its truth table in your lab notebook. d. Also show how to make an inverter from a NOR. Implement Boolean functions on Basys3 (if time permits). a. Following directions from your lab TA (to get constraints and use the keypad optionally), construct VHDL equations for functions Fi and Fz in VHDL. b. Open a new project in Xilinx and Add Sources and Constraints for the two functions, c. Finally, generate a bit stream of your design and download it into the Artix chip. d. Enter some numeric characters on the keypad and see if your functions are working properly