- A Logic Circuit Simulation Library in C++

lcs::DFlipFlop< type, delay > Class Template Reference

#include <dflipflop.h>

Inheritance diagram for lcs::DFlipFlop< type, delay >:

List of all members.

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Detailed Description

template<PulseEdge type = POS_EDGE, unsigned int delay = 0>
class lcs::DFlipFlop< type, delay >

This is a class template which encapsulates a D-Flipflop. Initialising as object of using this template requires two template parameters. The first parameter should either be lcs::POS_EDGE or lcs::NEG_EDGE. lcs::POS_EDGE (which is the default) indicates a positive edge triggered flipflop, where as lcs::NEG_EDGE indicates a negetive edge triggered flipflop. The second template parameter indicates the propogation delay involved in transeffering the data input to the output of the flipflop when triggered.

Public Member Functions
	DFlipFlop (const Bus< 1 > &QBus, const InputBus< 1 > &DBus, const InputBus< 1 > &clock, const InputBus< 1 > &reset)
virtual	~DFlipFlop (void)
virtual void	onPosEdge (int portId)
virtual void	onNegEdge (int portId)
virtual void	onStateChange (int portId)
Static Public Attributes
static const int	D = 0
static const int	CLK = 1
static const int	Q = 2
static const int	RST = 3

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Constructor & Destructor Documentation

template<PulseEdge type, unsigned int delay>

lcs::DFlipFlop< type, delay >::DFlipFlop	(	const Bus< 1 > &	QBus,
		const InputBus< 1 > &	DBus,
		const InputBus< 1 > &	clock,
		const InputBus< 1 > &	reset
	)

The only explicit constructor. The other constructors, if synthesized by the compiler, are practically useless and hence their use should be avoided.

Parameters:

	QBus	The bus connected to the Q output port of the flipflop.
	DBus	The bus connected to the D input port of the flipflop.
	clock	The clock input to the flipflop
	reset	The reset input to the flipflop. If the reset input is lcs::HIGH, then the Q output will lcs::LOW not matter what the D input and clock input are.

template<PulseEdge type, unsigned int delay>

lcs::DFlipFlop< type, delay >::~DFlipFlop

(

void

)

[virtual]

Destructor.

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Member Function Documentation

template<PulseEdge type = POS_EDGE, unsigned int delay = 0>

virtual void lcs::DFlipFlop< type, delay >::onNegEdge

(

int

portId

)

[inline, virtual]

The function which is triggered by the clock input in case of a negetive edge triggered flipflop. User of the class lcs::DFlipFlop will never need to call this function under normal circumstances.

Reimplemented from lcs::Module.

template<PulseEdge type = POS_EDGE, unsigned int delay = 0>

virtual void lcs::DFlipFlop< type, delay >::onPosEdge

(

int

portId

)

[inline, virtual]

The function which is triggered by the clock input in case of a positive edge triggered flipflop. User of the class lcs::DFlipFlop will never need to call this function under normal circumstances.

Reimplemented from lcs::Module.

template<PulseEdge type, unsigned int delay>

void lcs::DFlipFlop< type, delay >::onStateChange

(

int

portId

)

[virtual]

This function handles the reset button.

Reimplemented from lcs::Module.

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Member Data Documentation

template<PulseEdge type = POS_EDGE, unsigned int delay = 0>

const int lcs::DFlipFlop< type, delay >::CLK = 1 [static]

A static integer which denotes the port corresponding to the clock input to the flipflop.

template<PulseEdge type = POS_EDGE, unsigned int delay = 0>

const int lcs::DFlipFlop< type, delay >::D = 0 [static]

A static integer which denotes the port corresponding to the D input to the flipflop.

template<PulseEdge type = POS_EDGE, unsigned int delay = 0>

const int lcs::DFlipFlop< type, delay >::Q = 2 [static]

A static integer which denotes the port corresponding to the output to the flipflop.

template<PulseEdge type = POS_EDGE, unsigned int delay = 0>

const int lcs::DFlipFlop< type, delay >::RST = 3 [static]

A static integer which denotes the port corresponding to the reset input of the flipflop.

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Copyright © 2006, 2007 Siva Chandra