Question

Q1. The basic functionality of a D flip-flop (FF) can be implemented with a J-K FF by connecting the input D to J and D' to K. a) Show that this is true by comparing the characteristic equations for a D FF and JK FF. b) Draw a timing diagram for clock, D and outputs Qp, On, Qms that illustrates the difference in input/output behavior of a positive edge triggered D FF, negative edge triggered D FF and a master slave D FF (implemented from a JK master- slave FF). Include some transitions on D while the clock is asserted.

Answer 1

A)

Truth Tables of both flip flops тк фон фон oo On (Nochanges o I (Reset) ; 10 1 0 (set) l ! Po Po croggle) до ol 0 1 5 characteristie Stable PS NS Flip flop input of JK D on Onth JK 0 0 0 0 x x - - x x o Hae PS- Present State Excitation teble of į k PS NS inputs In anti J K. NS- Neat State 0 1 - x X txo

K Map Simplification J and k inputs interms of song input Jao So to convert a Jk flip flop into oflip flop Inputs must be J=D ; K= ł So above given statement in question is true ------ CLK Dflip flop using Jk flipflop

B )

at 7 - -- - - . F' - --- - - -|-Hy CLK the edge Dilipoftop (-ve edge Oflipflop

LEM 1 - + - - re Seebat posedge no output only at ve edge output Fransitions are the transitions occur Om- Dutput of Mastor D Flip Flop (Master Slove are there Ons - Outpul at Slave of Master Slavcflipflon

Explanation regarding master slave flip flop

for Master Slave o flipflop it take somes explanation Ums JK Morten JIK Master clock È slave Baluc (CLK Slave Mastest

In a Master Slave flip flop the input is taken by Mosten at positive clk transition and output is given slave wort negative transition of CLK since slave receives inverted clk so output Master Slowe will be with respecte to negative operating clock if positive edge flip flops are cesed # for Mostes blowe else negative edge flip flops are used then output transitions occure at positive edge of elk.