ABC-XY flip-flop: An \"ABC-XY 2-bit flip-flop\" receives as input a CLK variable

Question

ABC-XY flip-flop: An "ABC-XY 2-bit flip-flop" receives as input a CLK variable (clock) and 3 single bit variables A. B and C: and has 2 output, bits X and Y. An ABC-XY flip-flop updates the values of X and Y on the rising edge of CLK according to the following logic: Namely, when C = 0. then both X and Y receive the value of .4. When C = 1. based on the value of B. one of A or Y receives the value of .4 and the other remains unchanged. Design an ABC-XY flip-flop using D Hip-Hops and additional primitives of combinational logic.

Explanation / Answer

According to Dflip flop logic if clk =1 then Q = D based on that

A   B    C      X   Y

0     0    0      Xprev         A

0      0    1      A          Xprev

0       1    0      Xprev        B

0        1    1      Xprev       B

1         0    0      A          B

1         0    1       A         B

0         1     1      A          C

1         1      1     A          C

to satisify the logic of Dflip flop logic inputs

some times it may acting as a D-Latch

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