JK_FlipFlop: Resetting/Setting Input to Flip Flop Output
This figure shows the pin diagram of the JK_FlipFlop function block:
The JK_FlipFlop function block implements the truth table for JK flip-flop.
This function block refers to a flip-flop that obeys this truth table:
|
i_xClk |
i_xJ |
i_xK |
q_xQ(n) |
q_xQ(n+1) |
Operation |
|---|---|---|---|---|---|
|
0 |
X |
X |
X |
Q(n) |
Hold |
|
RE |
0 |
0 |
0 |
0 |
Hold |
|
RE |
0 |
0 |
1 |
1 |
Hold |
|
RE |
0 |
1 |
0 |
0 |
Reset |
|
RE |
0 |
1 |
1 |
0 |
Reset |
|
RE |
1 |
0 |
0 |
1 |
Set |
|
RE |
1 |
0 |
1 |
1 |
Set |
|
RE |
1 |
1 |
0 |
1 |
Toggle |
|
RE |
1 |
1 |
1 |
0 |
Toggle |
|
n ‘n’ is the present state and (n+1) is the next state. RE Rising Edge |
|||||
The Reset input (i_xRst) resets the flip flop output q_xQ, whereas Set input (i_xSet) sets the flip flop output q_xQ.
Truth table represented as a time diagram:
This table describes the input pins of the JK_FlipFlop function block:
|
Input |
Data Type |
Description |
|---|---|---|
|
i_xJ |
BOOL |
TRUE: i_xJ input active. FALSE: Disabled (factory setting) |
|
i_xK |
BOOL |
TRUE: i_xK input active. FALSE: Disabled (factory setting) |
|
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 JK_FlipFlop function block:
|
Output |
Data Type |
Description |
|---|---|---|
|
q_xQ |
BOOL |
Flip-flop output |
In JK flip-flop the inputs i_xSet and i_xRst have higher priority than i_xJ and i_xK inputs. When both the inputs i_xSet and i_xRst are either FALSE /TRUE then the output of the FB q_xQ, depends upon the inputs i_xJ and i_xK and i_xClk.
