DFLIPFLOP

Block Screenshot

Contents

• D flip-flop

• • Palette

  • Description

  • Data types

  • Default properties

  • Interfacing function

  • See also

  • Authors

Palette

• Integer palette

Description

That block outputs on Q its input state (D) when the enable input (en) is set and on the rising edge of the clock input (clk). The !Q output is the logical negation of Q. This flip-flop is also known as a delay flip-flop because the state of the input is modified only at the next rising edge of the clock.

The D flip-flop is used as a basic cell of shift-registers.

The truth table of this block is the following:

Non-Rising

where X stands for "indifferent" and Qn-1 is the previous output state of Qn.

Data types

The block supports the following types :

• Inputs:

  • D: scalar. Scilab's int8 data type only.

  • en: scalar. Scilab's real double.

  • clk: scalar. Scilab's real double.

  A positive input is considered as logical 1, a negative or a null input as logical 0.

• Outputs : scalar. Scilab's int8 data type.

Default properties

• always active: no

• direct-feedthrough: yes

• zero-crossing: no

• mode: no

• regular inputs:

  - port 1 : size [1,1] / type 5

  - port 2 : size [1,1] / type 1

  - port 3 : size [1,1] / type 1

• regular outputs:

  - port 1 : size [1,1] / type 5

  - port 2 : size [1,1] / type 5

• number/sizes of activation inputs: 0

• number/sizes of activation outputs: 0

• continuous-time state: no

• discrete-time state: no

• object discrete-time state: no

• name of computational function: csuper

Interfacing function

• SCI/modules/scicos_blocks/macros/IntegerOp/DFLIPFLOP.sci

See also

• DLATCH — D latch flip-flop
• SRFLIPFLOP — SR flip-flop
• JKFLIPFLOP — JK flip-flop

Authors

Fady NASSIF - INRIA