flushlogic.v

encoder jpeg project

/*******************************************************************/
/*	This module implements the logic to flush the entropy       */
/*	encoder pipeline after the last data has arrived	     */
/*******************************************************************/

module FlushLogic(	Reset, 
                     Clock, 
                     Enable, 
                     EndData, 
                     ReadyIn, 
                     Flush, 
                     LastData, 
                     ReadyOut
                  );

input 		Reset;
input 		Clock; 
input 		Enable;
input 		EndData; 	// Signals the end of data arrival	
input 		ReadyIn;	// Ready status from Data Packer

output 		Flush; 	// Signal used to flush the pipeline
output 		LastData;  	// Informs Data Packer about last data
output 		ReadyOut;	// Informs the top controller of status	

reg 			Flush; 
reg 			LastData; 
reg			ReadyOut;

integer 		Index;	       // Used to track flush count
reg 			Over;		// Internal flag, set after EndData Pulse

	
always@(posedge Clock or negedge Reset)
	begin
	if(!Reset)
		begin
		Flush <= 0;
		Over <= 0;
		LastData <= 0;
		ReadyOut <= 0;
		Index <= 0;
		end
	else if(Enable)
		begin
		if(EndData)		// if last data has arrived
			Over <= 1;	// set the internal flag
		if(Over)		// if internal flag set, start counter
			Index <= Index + 1;
		
		if(Index==2)	// time to set the flush signal
			Flush <= 1; 
		else if(Index==9) // time to lower the flush signal
			Flush <= 0;		
		else if(Index==14) // time to inform data packer		
			LastData <= 1;
		if(ReadyIn & Over) // if data packer has finished work	
			begin
			ReadyOut <= 1;
			Over <= 0;
			Index <= 0;
			end
		else
			ReadyOut <= 0;
		end	
	end
endmodule