I am a little confused about the Truth table of D-flip flop,and i want to figure it out.

According to the d-flip flop in wiki:

D-flip flop with set(S) and reset(R):

If S=R=0,Q depend on clk and D,when clk is Rising edge,and D=1,Q=1

If S=1,or R=1,Q depend on S or R,when S=1,means set Q=1; R=1,means set Q=0

If S=1,R=1,Q depend on nothing,Q=1,Q'=1

But,if d-flip flop with reset,(no set here) ,when R=0,Q is not always 0,when clk is Rising edge,and D=1,Q=1

But i see the waveform in this picture,and the waveform is not the same as the the wiki said,can anyone help me figure it out? The picture is from this website: http://macao.communications.museum/eng/exhibition/secondfloor/MoreInfo/FlipFlop.html

• Your wavefrom drawing shows Set and Reset as Active Low - if Set is Low, Q will be forced High. Your text describes a flip-flop with Active-High Set and Reset. Commented Sep 15, 2017 at 15:34
• Show the relevant Wiki citation and link. Commented Sep 15, 2017 at 15:34
• en.wikipedia.org/wiki/Flip-flop_(electronics) Commented Sep 15, 2017 at 15:52
• The diagram above should really show /SET and /RESET as the bottom two items. Commented Sep 15, 2017 at 17:31