crystal User Manual
Version: 6.6.0/2
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19. Configuring Custom Logical Behaviour
19.25
TFF (Toggle Flip Flop)
"Logic -> TFF"
A
TFF
element is a Toggle Flip Flop. When a positive edge arrives at the input signal, this triggers a change of
state at the output. A common application is to create a latching MF Key.
General Parameters
TFF
Reference name for the element.
Toggle
Assigns the input control signal to be toggled.
Reset Static
This input control signal will force a reset (i.e. set the control output to “0”). The reset is active
as long as the input control signal = logical “1”.
Set Static
As above, but this time the control output is set to “1”.
Reset Pos Edge
This input control signal will force a reset (i.e. set the control output to “0”). The reset is
triggered from the rising edge of the input control signal.
Set Pos Edge
As above, but this time the control output is set to “1”.
The control outputs appear under the “Logic -> <GroupName> -> TFF” branch of the 'Tree Selection' window:
Out
The TFF output.
nOut
Negated TFF.
