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Unformatted text preview: Score: _______ / 30 Your Class No. is the last four digits of your PUID followed by the first character of your last name. ECE 270 Introduction to Digital System Design Fall 2011 2. [16 pts] ABEL Review Questions: (a) A0 , A1 , A2 , A3 defined as the set ALL : (b) B0 , B1 , B2 , B3 , B4 used as a range: (c) GE used as the tri-state enable for output signals G0 , G1 , G2 , G3 : (d) Write using ABEL syntax: G(W,X,Y,Z) = (X ⊕ Z)·(W ⊕ Y) ′ (e) Write using ABEL syntax: F(W,X,Y,Z) = W ′ ·Z·(X + Y ′ ) + Y·(X ′ + W + Z) (f) ABEL declaration that specifies input variables SA , SB , and SC are active low : (g) ABEL declaration that specifies variables R0 , R1 , R2 , and R3 are active low combinational outputs: (h) ABEL equation statement specifying that the tri-state enable for combinational output signals R0 , R1 , R2 , and R3 is given by the expression A·B ′ ·C:...
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- Spring '08