Question

CAN SOMEONE HELP ME AND WITH SOLVING AND EXPLAINING IT TO ME PLEASE?

Short Answer Question 2 - The Display [10 marks]
Rather than showing numbers, we want to design our 7-segment display for letters. Design a circuit to decode our binary representation of each pressed key into the closest approximation of the ASCII letter (5 = A, 6 = B, 7 = C, 8 = D). Each segment of the display (a-g) is an LED that turns on with a logic 1 and off with a logic 0. This question has two parts (a, b).
a) Neatly state your ordered truth table for this design. Clearly label inputs, output, and all ensure all literals match the given labels. [4 marks]
b) Provide the minimized NAND implemented circuit for ONLY the a segment of the display. For this design implementation, the “don’t care” case cannot be used. [6 marks]
NOTE : in this low seven segment display 1 is off and 0 is on.

Answer 1

@ AnRwer: *To desian a CCuit to decade our binary repreentation of each pressed Key into clotest approzimation of the Ascu letter Each Segement ditplay La-a) The low Seament dixplay l'a ofP and 'o'i2 on TYuth Table:- egnent dxply olp Decoder outputs Inpats A BCD abcde 이0|011 |0| t|| |00|010 이01|1|||1 | 1| 1 | 010|1 o1|010|0| 11|0|0| 니|1 3 6 000 Tabl) : Truth Table

From table u, The decoder outputs Ca-) shauRhe dipferent Com binationy -Por whichit i8 to be ON. Here, a iR ON for o,2/3, 5, 6,t ,8 and 9. biON O/2, 3, 4,,8and Stmilay for cde,fa When veguired to daplay 2i only band c > heed to be oN. So in the Tabet) The valuep of abcdefa -oo000 3T pYovtde -the mintmized NAND Tmplemented Circurt for only the a Seament Now, Prom Table til, Hrite the &pressiom la n sop fom CSum of products). i-e, F(A,8,cD) £m (0/213,5,6,t,R9) Nlow, minimiae the above Expreon utngi K-map (karnaush- Nap) CD AB oo o D O Here, ue Cann't uge "don't care" Case . The minimized Expreyion foY a if a AC+ ABc+BDtD

Implementation of NAND circuit AC ABC ABD CL D uNAND Coruit mplementation NAND (AC, ABE, RaD BD NAND( Prom Pigu, An Demorans law, a AC. ABE- ABD .BCD . a= AC +ABE +AB0+ BED Hence, The dexited Expreston Sement a uing NAND Cicuit tmplementation, a = ĀctABč +ĀBD +BCB