gpsnavidatagen_4ch.v

基于verilog语言的ＧＰＳ模拟源代码

	 			case (Sat1_NavBit_Cnt)
	 				19: begin
	 					case (Sat1_Subframe_Cnt)
	 						0,1,2: NaviData1 <= 0;
	 						3,4: NaviData1 <= 1;
	 					endcase
	 				end
	 				
	 				20: begin
	 					case (Sat1_Subframe_Cnt)
	 						0,3,4: NaviData1 <= 0;
	 						1,2: NaviData1 <= 1;
	 					endcase
	 				end
	 				
	 				21: begin
	 					case (Sat1_Subframe_Cnt)
	 						1,3: NaviData1 <= 0;
	 						0,2,4: NaviData1 <= 1;
	 					endcase
	 				end
	 				
	 				default:
	 					if (NB1)
	 						NaviData1 <= ~NaviData1;
	 						//NaviData1 <= 0;
	 			endcase
	 			
	 		NAVIDATAWORD:
	 			if (NB1)
	 				NaviData1 <= ~NaviData1;
	 				//NaviData1 <= 0;
	 	endcase
	end

`ifdef DEBUG_NAVI
initial
  begin
      i = 1;
      j = 1;
  end
  
always @(posedge in_clk)
 begin
// 	if (i == 1)
// 	  begin
// 	  	$display("==============================================\n");
// 	  	$display("subfram: %d\n", j);
// 	  	$display("==============================================\n");
// 	  	if (j==5)
// 	  		j=1;
// 	  	else
// 	  		j = j+1;
// 	  end
 	
	if (NB1)
	  begin
	  	$display("NaviBit%d: %b\n", i, NaviData1); 
	  	if (i==300)
	  	  begin
	  	  	$display("==============================================\n");
	  	  	$display("subfram: %d\n", j+1);                                
	  	  	$display("==============================================\n");
	  		j = j+1;
	  		i = 1;	  		
	      end
	  	else
	  		i = i+1;
	  end
 end
`endif

// Generate the navigation data for satellite 2
always @(posedge in_clk or negedge in_Resetn)
	begin
	 if (!in_Resetn)
	 	NaviData2 <= 1;
	 else
	 	case (Sat2_status)
	 		TLMWORD:
	 			case (Sat2_NavBit_Cnt)
	 				0,
	 				4,
	 				6,
	 				7: NaviData2 <=1;
	 				
	 				1,
	 				2,
	 				3,
	 				5: NaviData2 <=0;
	 				
	 				default: 
	 				 if(NB2)
	 				 	NaviData2 <= ~NaviData2;
	 			endcase
	 			
	 		PARITY:
	 			case (Sat2_NavBit_Cnt)
	 				24: NaviData2 <= Sat2_PrtW[0];
	 				25: NaviData2 <= Sat2_PrtW[1];
	 				26: NaviData2 <= Sat2_PrtW[2];
	 				27: NaviData2 <= Sat2_PrtW[3];
	 				28:                              
	 					begin                        
	 					 if (Sat2_Word_Cnt == 9)     
	 					  NaviData2 <= 0;            
	 					 else                        
	 					  NaviData2 <= Sat1_PrtW[4]; 
	 					end                          
	 					                             
	 				29:                              
	 					begin                        
	 					 if (Sat2_Word_Cnt == 9)     
	 					  NaviData2 <= 0;            
	 					 else                        
	 					  NaviData2 <= Sat2_PrtW[5]; 
	 					                             
	 					end                          
	 			endcase
	 			
	 		HOWWORD:
	 			case (Sat2_NavBit_Cnt)
	 				19: begin
	 					case (Sat2_Subframe_Cnt)
	 						0,1,2: NaviData2 <= 0;
	 						3,4:   NaviData2 <= 1;
	 					endcase
	 				end
	 				
	 				20: begin
	 					case (Sat2_Subframe_Cnt)
	 						0,3,4: NaviData2 <= 0;
	 						1,2:   NaviData2 <= 1;
	 					endcase
	 				end
	 				
	 				21: begin
	 					case (Sat2_Subframe_Cnt)
	 						1,3:   NaviData2 <= 0;
	 						0,2,4: NaviData2 <= 1;
	 					endcase
	 				end
	 				
	 				default:
	 					if (NB2)
	 						NaviData2 <= ~NaviData2;
	 			endcase
	 			
	 		NAVIDATAWORD:
	 			if (NB2)
	 				NaviData2 <= ~NaviData2;
	 	endcase
	end

// Generate the navigation data for satellite 3
always @(posedge in_clk or negedge in_Resetn)
	begin
	 if (!in_Resetn)
	 	NaviData3 <= 1;
	 else
	 	case (Sat3_status)
	 		TLMWORD:
	 			case (Sat3_NavBit_Cnt)
	 				0,
	 				4,
	 				6,
	 				7: NaviData3 <=1;
	 				
	 				1,
	 				2,
	 				3,
	 				5: NaviData3 <=0;
	 				
	 				default: 
	 				 if(NB3)
	 				 	NaviData3 <= ~NaviData3;
	 			endcase
	 			
	 		PARITY:
	 			case (Sat3_NavBit_Cnt)
	 				24: NaviData3 <= Sat3_PrtW[0];
	 				25: NaviData3 <= Sat3_PrtW[1];
	 				26: NaviData3 <= Sat3_PrtW[2];
	 				27: NaviData3 <= Sat3_PrtW[3];
	 				28:                              
	 					begin                        
	 					 if (Sat3_Word_Cnt == 9)     
	 					  NaviData3 <= 0;            
	 					 else                        
	 					  NaviData3 <= Sat3_PrtW[4]; 
	 					end                          
	 					                             
	 				29:                              
	 					begin                        
	 					 if (Sat3_Word_Cnt == 9)     
	 					  NaviData3 <= 0;            
	 					 else                        
	 					  NaviData3 <= Sat3_PrtW[5]; 
	 					                             
	 					end                          
	 			endcase
	 			
	 		HOWWORD:
	 			case (Sat3_NavBit_Cnt)
	 				19: begin
	 					case (Sat3_Subframe_Cnt)
	 						0,1,2: NaviData3 <= 0;
	 						3,4:   NaviData3 <= 1;
	 					endcase
	 				end
	 				
	 				20: begin
	 					case (Sat3_Subframe_Cnt)
	 						0,3,4: NaviData3 <= 0;
	 						1,2:   NaviData3 <= 1;
	 					endcase
	 				end
	 				
	 				21: begin
	 					case (Sat3_Subframe_Cnt)
	 						1,3:   NaviData3 <= 0;
	 						0,2,4: NaviData3 <= 1;
	 					endcase
	 				end
	 				
	 				default:
	 					if (NB3)
	 						NaviData3 <= ~NaviData3;
	 			endcase
	 			
	 		NAVIDATAWORD:
	 			if (NB3)
	 				NaviData3 <= ~NaviData3;
	 	endcase
	end

// Generate the navigation data for satellite 4
always @(posedge in_clk or negedge in_Resetn)
	begin
	 if (!in_Resetn)
	 	NaviData4 <= 1;
	 else
	 	case (Sat4_status)
	 		TLMWORD:
	 			case (Sat4_NavBit_Cnt)
	 				0,
	 				4,
	 				6,
	 				7: NaviData4 <=1;
	 				
	 				1,
	 				2,