RS_FlipFlop: Resetting/Setting of Flip Flop Input/Output
This figure shows the pin diagram of the RS_FlipFlop function block:
The RS_FlipFlop function block implements the truth table for RS flip-flop with reset priority.
The RS_FlipFlop refers to a flip-flop that obeys this truth table:
|
i_xClk |
i_xSet |
i_xRst |
q_xQ(n+1) |
|---|---|---|---|
|
0 |
X |
X |
Q(n) |
|
1 |
0 |
0 |
Q(n) |
|
1 |
0 |
1 |
0 |
|
1 |
1 |
0 |
1 |
|
1 |
1 |
1 |
0 |
|
n ‘n’ is the present state and (n+1) is the next state. |
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It has two inputs namely, a Set input or i_xSet, and a Reset input or i_xRst. It also has one output q_xQ. When both set and reset inputs are high, priority is given to Reset input (i_xSet=1 and i_xRst=1).
Truth table represented as a time diagram:
This table describes the input pins of the RS_FlipFlop function block:
|
Input |
Data Type |
Description |
|---|---|---|
|
i_xClk |
BOOL |
TRUE: Clock signal active. FALSE: Disabled (factory setting) |
|
i_xSet |
BOOL |
TRUE: Sets the flip-flop output. FALSE: Disabled (factory setting) |
|
i_xRst |
BOOL |
TRUE: Resets the flip-flop output. FALSE: Disabled (factory setting) |
This table describes the output pins of the RS_FlipFlop function block:
|
Output |
Data Type |
Description |
|---|---|---|
|
q_xQ |
BOOL |
Flip-flop output |
