Question

JILIW 21. Find the address range for Y5 on the following circuit. Calculate the total number bytes for the memory address range. U1 15 U1A A14 Reset 11 14 A15 13 A16 11 74LS04 2 U2 QQQQQQQQ Olo A17 A18_ 10 3 G1 G2A G2B 4 OR3 A19_ 74LS138 MEMR

Answer 1

fr Ys to be selected, first chip for u GI, G2A Enable signals ul must be enabled GRB out of these G1, G2B - To Enable Signal. OR zero. are already Enabled. GEA U2 COR 3) must give active low (Zero) gate gives zero only when all inputs are Mig A18 A17 = 000] for chip enable. now to select Ya BA-000 CBA= 101 [5] (ALLAIS AI4 = lol CBA A CAR AS A14] ! & Hence for Ala A18 A17 Air Ais A14 Aiz .... A2 A, AO Fines Variable. e so variables AR AIg A – – A2A, Ao Charge ooo –.000 to Ill - Ill. - Stalling address = AlqA18 A17 All Ais A4 A3 Ala Alg... Az AZALA fisted a sed poololoo 000000000 0000 | | 0 0 0 - (140004 Her Ending attress = AIG ALS AA All Als All Ajz Al ₂ All-.. Az A₂A, A fined c o ololll 111 1111 1111 F F F - (17FFF) H Hex. - Address Ranse (14000) for Yg is (14000) to (17FFF) to (17FFF)H - Total number of byles with n-bits is 2 bytes, hex variables are Alb Alq All Alo Aq Az A7 A As An Az AqA, AO Total address bits=n=14. Number of bestes - 29- 2 4 - 16384 bytes (Total number of listes - 2t - 16384 byles