This information is part of the Modelica Standard Library maintained by the Modelica Association.

Description in VHDL is given by http://www.cs.sfu.ca/~ggbaker/reference/std_logic/src/std_logic_entities.vhd

Truth Table for high active set and reset

DataIn	Enable	Reset	Set	DataOut	Map
*	*	*	U	U	1
*	*	U	~1	U	1
*	*	*	1	1	2
*	*	1	0	0	3
*	*	1	X	X	6
*	U	~1	~1	U	4,5,7,8
*	~U	X	X	X or U	4
*	~U	0	X	X or U or 1 or NC	5
*	~U	X	0	X or U or 0 or NC	7
*	X	0	0	X or U or NC	8
*	1	0	0	DataIn	8
*	0	0	0	NC	8

Truth Table for low active set and reset

DataIn	Enable	Reset	Set	DataOut	Map
*	*	*	U	U	1
*	*	U	~0	U	1
*	*	*	0	1	2
*	*	0	1	0	3
*	*	0	X	X	6
*	U	~0	~0	U	4,5,7,8
*	~U	X	X	X or U	4
*	~U	1	X	X or U or 1 or NC	5
*	~U	X	1	X or U or 0 or NC	7
*	X	1	1	X or U or NC	8
*	1	1	1	DataIn	8
*	0	1	1	NC	8

*  = do not care
~  = not equal
U  = L.'U'
0  = L.'0' or L.'L'
1  = L.'1' or L.'H'
X  = L.'X' or L.'W' or L.'Z' or L.'-'
NC = no change

ResetSetMap	Value: [1, 1, 1, 1, 1, 1, 1, 1, 1; 1, 4, 7, 2, 4, 4, 7, 2, 4; 1, 5, 8, 2, 5, 5, 8, 2, 5; 1, 6, 3, 2, 6, 6, 3, 2, 6; 1, 4, 7, 2, 4, 4, 7, 2, 4; 1, 4, 7, 2, 4, 4, 7, 2, 4; 1, 5, 8, 2, 5, 5, 8, 2, 5; 1, 6, 3, 2, 6, 6, 3, 2, 6; 1, 4, 7, 2, 4, 4, 7, 2, 4] Type: Integer[L,L] Description: Function selection by [reset, set] reading
strength	Value: S.'S_X01' Type: Strength Description: Output strength
n	Value: 1 Type: Integer Description: Data width