X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/raggedstone/blobdiff_plain/36a53ce255c40f7051820ffbaaac1dd646a83bfb..377c02420489dd18db3ce053a075d7eca4ae799b:/dhwk/source/connecting_fsm.vhd

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+-- J.STELZNER
+-- INFORMATIK-3 LABOR
+-- 23.08.2006
+-- File: CONNECTING_FSM.VHD
+
+library ieee ;
+use ieee.std_logic_1164.all ;
+
+entity CONNECTING_FSM is
+	port
+	(
+	PCI_CLOCK				:in		std_logic; 
+	RESET						:in		std_logic; 
+	PSC_ENABLE			:in		std_logic;
+	SYNC_S_FIFO_EFn	:in		std_logic;
+	SPC_ENABLE			:in		std_logic;
+	SYNC_R_FIFO_FFn	:in		std_logic;
+ 	S_FIFO_Q_OUT		:in		std_logic_vector(7 downto 0);
+	S_FIFO_READn		:out	std_logic;
+	R_FIFO_WRITEn		:out	std_logic;
+	R_FIFO_D_IN			:out	std_logic_vector(7 downto 0) 
+	);
+end entity CONNECTING_FSM;
+
+architecture CONNECTING_FSM_DESIGN of CONNECTING_FSM is
+
+	signal REG						:std_logic_vector(7 downto 0);
+	signal HELP_0,HELP_1	:std_logic;
+	signal SIG_LOAD				:std_logic;
+
+
+--**********************************************************
+--***         CONNECTING FSM CODIERUNG                   ***
+--**********************************************************
+--
+--
+--                                                 ---------- HELP_0
+--                                               	 |--------- HELP_1   
+--                                              	 ||-------- LOAD   
+--                                             	   |||------- WRITE   
+--																							   ||||------ READ   
+--																								 |||||     
+	constant	S0	:std_logic_vector(4 downto 0)	:=	"00011";--
+	constant	S1	:std_logic_vector(4 downto 0)	:=	"01010";--READ
+	constant	S2	:std_logic_vector(4 downto 0) :=	"10010";--READ
+	constant	S3	:std_logic_vector(4 downto 0) :=	"11110";--READ,LOAD
+	constant	S4	:std_logic_vector(4 downto 0) :=	"11011";--
+	constant	S5	:std_logic_vector(4 downto 0) :=	"01001";--WRITE
+	constant	S6	:std_logic_vector(4 downto 0) :=	"10001";--WRITE
+	constant	S7	:std_logic_vector(4 downto 0) :=	"11001";--WRITE
+
+	signal STATES	:std_logic_vector(4 downto 0);
+
+--************************************************************
+--***             FSM SPEICHER-AUTOMAT                     ***
+--************************************************************
+
+	attribute	syn_state_machine	:	boolean;
+	attribute	syn_state_machine	of	STATES	:	signal	is	false;
+
+--************************************************************
+--***             		REGISTER BESCHREIBUNG	               ***
+--************************************************************
+
+begin
+
+	process (PCI_CLOCK) 
+	begin
+		if	(PCI_CLOCK'event	and	PCI_CLOCK	=	'1')	then
+			if			SIG_LOAD	=	'1'	then	REG	<=	S_FIFO_Q_OUT;
+				elsif	SIG_LOAD	=	'0'	then	REG	<=	REG;   
+			end if;
+		end if;
+	end process;
+
+--************************************************************
+--***             		FSM BESCHREIBUNG		                 ***
+--************************************************************
+
+	process (PCI_CLOCK)
+	begin  
+		if	(PCI_CLOCK'event	and	PCI_CLOCK	=	'1')	then
+  
+			if	RESET	=	'1'	then	STATES <= S0;
+				else
+  
+					case	STATES is
+
+					when	S0	=> 
+						if	PSC_ENABLE			= '1'	and
+								SPC_ENABLE			=	'1'	and
+								SYNC_S_FIFO_EFn	=	'1'	then
+
+												STATES	<=	S1;
+							else  
+												STATES	<=	S0;
+						end if;
+
+					when	S1	=>	STATES	<=	S2;
+					when	S2	=>	STATES	<=	S3;
+					when	S3	=>	STATES	<=	S4;
+
+					when	S4	=> 
+						if	SYNC_R_FIFO_FFn	=	'1'	then
+
+												STATES	<=	S5;
+						else  
+    		                STATES	<=	S4;
+						end if;
+
+					when	S5	=>	STATES	<=	S6;
+					when	S6	=>	STATES	<=	S7;
+					when	S7	=>	STATES	<=	S0;
+
+					when others => 
+
+												STATES	<=	S0; 
+
+				end case;		-- STATES    
+			end if;				-- RESET 
+		end if;					-- PCI_CLOCK   
+	end process;			-- PROCESS
+
+--************************************************************
+--***      	ZUWEISUNG 	signal/out	<= 	STATES             ***
+--************************************************************
+
+	HELP_0				<=	STATES(4);  
+	HELP_1				<=	STATES(3);
+	SIG_LOAD			<=	STATES(2);
+	R_FIFO_WRITEn	<=	STATES(1);
+	S_FIFO_READn	<=	STATES(0);
+
+	R_FIFO_D_IN		<=	REG;
+
+end architecture CONNECTING_FSM_DESIGN;