Can somebody please explain what the variables S, D, Q mean in this problem...su

Question

Can somebody please explain what the variables S, D, Q mean in this problem...such as: S1, S0, Qa, Qb...etc Thanks

10. Draw the logic diagram of a 3 bit register with the three D fip flops shown below (note: The flip flop marked with an A is the leftmost bit and three 4x1 multiplexers with mode selection inputs S1 and So. The register operates according to the following function table: (6 pts) g Si So Register Operation 0 0 Complement the outputs 0 1 No Change 1 0 Rotate Right Rotate Left You can use QA, QB, Qc, etc. as the inputs to your multiplexers. In other words, you don't have to draw the lines from the outputs of your flip flops DA QA Il 4X1 mux. I 4X1 mux DCIk Si So 4X1 QB mux So Clock

Explanation / Answer

Here S0 and S1 are select bit which select the input form the MUX ( 00 means bit 0, 01 means bit 1 like wise..)

D is input for the delay flipflop and Q is output state of the delay flipflop. Q' is complementary output state of the delay flipflop.

here output of the flipflops are given to the input of the MUX, S0 and S1 select one from 4 inpuy generate output for that and then it is given as input to delay flipflop.....process continues..

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