# F03prelim1sol - Problem 6: a. 7D; 125; 175. b. 19.A;...

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ENGRD 230 White Midterm Answers for Fall 2003 Problem 1: a. G=C'+B'; 2-input NAND. b. F=W'Z'+W'Y+XYZ+WX'Y'Z c. F=BC; 2-input AND Problem 2: a. 0,2,3,4,5,6,-8,-6,-4,-5,-3,-2 (Common error: including +8 or even +9). b. K-map with 5 zeros: a_L=A'B'C'+B'C'D+BCD a=(A+B+C)(B+C+D')(B'+C'+D') Using ones does not give min gate count. c. 3 ORs feeding AND, or 3 ANDs feeding or, or NAND-NAND or NOR-NOR. Problem 3: 6 transistors for two 3-input NORs. (Common error: breaking the 3 rules.) Problem 4: b. W'X'YZ' + W'XYZ' + W'X'Y'Z' + W'X'Y'Z + WX'Y'Z' + WX'Y'Z (Common errors: Not putting in Boolean form or not including all inputs in each term.) Problem 5: a. 1 10000000 (Overflow); 11011111 (Overflow); 11001100 (ok); 11111011 (ok) (Common errors: making an easy problem hard.)
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Unformatted text preview: Problem 6: a. 7D; 125; 175. b. 19.A; 25.625; 31.5. c. 00101011.1000; 43.5; 053.4. e. 0A; 10; 12. f. 84=-7C; 10000100; 604 or 204 or -174. d. 14.CCCD; 024.63146; 00010100.1100110 (Common errors for fractional part: .12, .011, .0011.) Problem 7: HHHHHHHHHHHHHLLL (# rights minus # wrong.) Problem 8: A=Y; B=X; C=W; D0=D1=Z; D6=D7=Vcc; /EN=D2=D3=D4=D5=GND. A=X; B=X; C=Y; D0=D4=Z; D3=D7=Vcc; /EN=D1=D2=D5=D6=GND. (Common error: Reversing A and C without compensating in other inputs.) Direct comments to Wes Swartz . Last modified on 03/10/21. ENGRD 230 Midterm Answers file:///C:/Local%20Data/My%20Documents/ECE230/2300-F2008/exams. .. 1 of 1 9/30/2008 9:38 AM...
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## This note was uploaded on 05/09/2009 for the course ENGRD 2300 taught by Professor Albonesi/long during the Fall '07 term at Cornell University (Engineering School).

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