addrgenerate.vhd

sdram控制器

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;

entity AddrGenerate is
	port (
	
        SdramClk:		in std_logic;					--时钟信号		                 
	reqack:			in std_logic;					--操作结束标志
	Reset: 			in std_logic;					--复位信号
	--cmdlengthcount:		in std_logic_vector(9 downto 0);		--计数器值					 
        --PageWrfstAdr:		in std_logic_vector(11 downto 0);		--??页读首地址，固定	         
	PageWrfstAdr:		in std_logic_vector(13 downto 0);		--??页读首地址，固定
	--PageRdfstAdr:		in std_logic_vector(11 downto 0);		--??页写首地址，固定	         		
	PageRdfstAdr:		in std_logic_vector(13 downto 0);
	OperationReq:		in std_logic_vector(2 downto 0);		--操作码	        
	PageWeAdrSet:		in std_logic;					--页读首地址复位信号		                 
	PageRdAdrSet:		in std_logic; 					--页写首地址复位信号                              		                
	ADDR:			out std_logic_vector(22 downto 0); 		--??地址总线              
	HostRd 		: 	in 	  std_logic;
	HostAdr:		in std_logic_vector(22 downto 0);		--??随机读写地址		 
        FIFO1Data:		in std_logic_vector(15 downto 0);		--FIFO1输出数据	         
	DataOut:		out std_logic_vector(15 downto 0);		--数据总线输出		  
	FIFO2Data:		out std_logic_vector(15 downto 0);		--FIFO2输入数据	         
        DataIn:			in std_logic_vector(15 downto 0);		--数据总线输入	         
        HostDataout:		out std_logic_vector(15 downto 0);		--随机读写数据	 
	HostDatain:		in std_logic_vector(15 downto 0);
	--ackcount       		: in      std_logic_vector(2 downto 0);
	sdramin          : out      std_logic_vector(15 downto 0);
--	cmd			: in      std_logic_vector(2 downto 0);
	count5         : in      std_logic_vector(2 downto 0);
	count3         		: in      std_logic_vector(2 downto 0)
             );
end AddrGenerate;

architecture rtl of AddrGenerate is

	signal 	randomaddr:std_logic_vector(22 downto 0):="00000000000000000000000"; --??
	signal 	clk:std_logic;
	
	signal 	writeaddr:std_logic_vector(13 downto 0):="00000000000000";--??
	signal 	readaddr:std_logic_vector(13 downto 0):="00000000000000"; --??
	
begin
	clk<=SdramClk;
	randomaddr<=HostAdr;
	sdramin <= DataIn;
	DataOut <= HostDatain when OperationReq="011" else FIFO1Data;
		   

process(clk,OperationReq,writeaddr,readaddr,PageWeAdrSet,PageRdAdrSet,reset,HostRd)

	begin

	if (reset='0')then							--复位
			FIFO2Data<="0000000000000000";
			HostDataout<="0000000000000000";
			ADDR<="00000000000000000000000";		--??
			writeaddr<="00000000000000";
			readaddr<= "00000000000000";	
	elsif (clk'event and clk='1')then
	
-------------------页读页写首地址复位操作-------------------------------------------
			if (PageWeAdrSet='1')then 
				writeaddr<=PageWrfstAdr;
			end if;

  		 	if (PageRdAdrSet='1')then 
				readaddr<=PageRdfstAdr;
 			end if;

	
		
	case OperationReq is
			 

-------------------无操作Idle---------------------------------------
		when "000"=>
				ADDR<= "00000000000000000000000";

-------------------页写地址产生-------------------------------------
		when "001" =>
			--if(cmdlengthcount>="0000000001")then
			if(count5 ="001") then
 				ADDR<=writeaddr & "000000000";			--??
			end if;

			if(reqack='1')then
				writeaddr<=writeaddr+1;				--页写地址加1
			end if;


-------------------页读地址产生-----------------------------------------
		when "010" =>
			--if(cmdlengthcount>="0000000001")then
			if(count5 ="001") then
 				FIFO2Data<= DataIn;
				ADDR<= readaddr & "000000000";			--??
			end if;

			if(reqack='1')then
				readaddr<=readaddr+1;				--页读地址加1
			end if;

-------------------随机写地址产生---------------------------------------
		when "011" =>
			--if(cmdlengthcount>="0000000001")then
				if(count5 ="001") then
				ADDR<=randomaddr;
			end if;




-------------------随机读地址产生---------------------------------------
		when "100" =>
			--if(cmdlengthcount>="0000000001")then
			--if(count5 ="001") then			   
			if(count3 = "101") then
					if(HostRd= '0') then
						HostDataout <= DataIn;
					end if;			
			end if;
				ADDR <= randomaddr;
		--	end if;



-------------------配置页模式-----------------------------------
		when "101" =>
------------------------------------------------											  
		   --load_mode_reg			
--			if(count1 = "001") then
--				ADDR<= "00000000000000000100111";	
--			end if;			  			  
		   --load refresh reg2--05f6
--			if(count2 = "001") then	
--				ADDR<= "00000000000000111111010";	
--			end if;	
-------------------------------------------------
		--if(cmd = "101" and ackcount="011" ) then 	--load_mode_reg	
		if(count5 ="001") then			   
		ADDR<= "00000000000000000100111";

		end if;	
		  												
			
-------------------配置随机模式-----------------------------------
		when "110" =>
			--if(cmd = "101" and ackcount="011" ) then 
			if(count5 ="001") then  
				ADDR<= "00000000000000000100000";
       			end if;
	

		when others =>NULL; 
	end case;
	end if;
end process;
end rtl;