S	R	D	CLK	Q
0	0	0	0	0
1	0	0	0	0
1	1	0	0	HIGH-Z
0	1	0	0	1
0	1	1	0	1
1	1	1	0	HIGH-Z
1	0	1	0	0
0	0	1	0	0
0	0	1	1	0
1	0	1	1	0
1	1	1	1	HIGH-Z
0	1	1	1	1
0	1	0	1	1
1	1	0	1	HIGH-Z
1	0	0	1	0
0	0	0	1	0

function: Q = (!S && R && !D && !CLK || !S && R && D && !CLK || !S && R && D && CLK || !S && R && !D && CLK)