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Circuit Description

This applet is meant to demonstrate the basic NOT (inverter), AND, and OR logic functions in the std_logic_1164 multilevel logic system. To this end, it includes a special interactive switch (hades.models.io.IpinStdLogic1164) that can directly generate all logic values of the std_logic system. Just click on the corresponding field in the switch's symbol to generate that output value. A click in the (0/1) field will toggle the output value between '0' and '1'.

std_logic_1164 NOT:

    U X 0 1 Z W L H D
    -----------------
    U X 1 0 X X 1 0 X

std_logic_1164 AND:

    U X 0 1 Z W L H D
    -----------------
U | U U 0 U U U 0 U U
X | U X 0 X X X 0 X X
0 | 0 0 0 0 0 0 0 0 0
1 | U X 0 1 X X 0 1 X
Z | U X 0 X X X 0 X X
W | U X 0 X X X 0 X X
L | 0 0 0 0 0 0 0 0 0
H | U X 0 1 X X 0 1 X
D | U X 0 X X X 0 X X

std_logic_1164 OR:

    U X 0 1 Z W L H D
    -----------------
U | U U U 1 U U U 1 U
X | U X X 1 X X X 1 X
0 | U X 0 1 X X 0 1 X
1 | 1 1 1 1 1 1 1 1 1
Z | U X X 1 X X X 1 X
W | U X X 1 X X X 1 X
L | U X 0 1 X X 0 1 X
H | 1 1 1 1 1 1 1 1 1
D | U X X 1 X X X 1 X