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

diff --git a/dhwk/source/PAR_SER_CON.vhd b/dhwk/source/PAR_SER_CON.vhd
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+-- $Id: PAR_SER_CON.vhd,v 1.1 2007-03-10 11:24:03 sithglan Exp $
+
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.std_logic_unsigned.all;
+
+entity	PAR_SER_CON	is
+	port
+	(
+	PCI_CLOCK		:in	std_logic; 
+	RESET				:in	std_logic; 
+	PSC_ENABLE			:in	std_logic; -- Parallel Serial Converter Enable
+	SYNC_S_FIFO_EFn	                :in	std_logic; -- Empty Flag (low active)
+	SPC_RDY_IN			:in	std_logic; -- Ready to receive data
+ 	PAR_IN				:in	std_logic_vector(7 downto 0);
+	SER_OUT				:out	std_logic; -- Serial Output
+	S_FIFO_READn		        :out	std_logic  -- FIFO Read (low active)
+	);			
+end entity	PAR_SER_CON ;
+
+architecture PAR_SER_CON_DESIGN	of PAR_SER_CON is
+
+constant STATE_END        :std_logic_vector(3 downto 0) := "0001";
+constant STATE_SEND       :std_logic_vector(3 downto 0) := "0010";
+constant STATE_SEND_BIT_0 :std_logic_vector(3 downto 0) := "0011";
+constant STATE_SEND_BIT_1 :std_logic_vector(3 downto 0) := "0100";
+constant STATE_SEND_BIT_2 :std_logic_vector(3 downto 0) := "0101";
+constant STATE_SEND_BIT_3 :std_logic_vector(3 downto 0) := "0110";
+constant STATE_SEND_BIT_4 :std_logic_vector(3 downto 0) := "0111";
+constant STATE_SEND_BIT_5 :std_logic_vector(3 downto 0) := "1000";
+constant STATE_SEND_BIT_6 :std_logic_vector(3 downto 0) := "1001";
+constant STATE_SEND_BIT_7 :std_logic_vector(3 downto 0) := "1010";
+
+signal COUNT     :std_logic_vector (3 downto 0);
+signal STATE     :std_logic_vector (3 downto 0); 
+signal DATUM     :std_logic_vector (7 downto 0);
+signal SYNC			 :std_logic; -- make SPC_RDY_IN stable
+
+attribute syn_state_machine:boolean;
+attribute syn_state_machine of STATE: signal is false;
+attribute syn_state_machine of COUNT: signal is false;
+begin
+
+process(PCI_CLOCK)
+begin
+        if (PCI_CLOCK'event and PCI_CLOCK = '1') then
+				        if ("0000" < COUNT) then
+        				        COUNT <= COUNT - 1;
+				        end if;
+
+                if (RESET = '1') then
+                        STATE <= STATE_SEND;
+                        COUNT <= "0000";
+                        SER_OUT <= '0';
+                        S_FIFO_READn <= '1';
+
+                elsif (PSC_ENABLE = '1') then
+												if (COUNT = "0000") then
+                        COUNT <= "0011";
+                        case STATE is
+                                when STATE_SEND =>
+                                        if(SYNC = '1' and SYNC_S_FIFO_EFn = '1') then
+                                                SER_OUT <= '1';
+                                                S_FIFO_READn <= '0';
+                                                STATE <= STATE_SEND_BIT_0;
+                                        end if;
+
+                                when STATE_SEND_BIT_0 =>
+                                                DATUM     <= PAR_IN;
+                                                S_FIFO_READn <= '1';
+                                                SER_OUT <= PAR_IN(0); 
+                                                STATE <= STATE_SEND_BIT_1;
+                                  
+                                when STATE_SEND_BIT_1 =>
+                                        SER_OUT <= DATUM(1); 
+                                        STATE <= STATE_SEND_BIT_2;
+
+                                when STATE_SEND_BIT_2 =>
+                                        SER_OUT <= DATUM(2); 
+                                        STATE <= STATE_SEND_BIT_3;
+
+                                when STATE_SEND_BIT_3 =>
+                                        SER_OUT <= DATUM(3); 
+                                        STATE <= STATE_SEND_BIT_4;
+
+                                when STATE_SEND_BIT_4 =>
+                                        SER_OUT <= DATUM(4); 
+                                        STATE <= STATE_SEND_BIT_5;
+                                        
+                                when STATE_SEND_BIT_5 =>
+                                        SER_OUT <= DATUM(5); 
+                                        STATE <= STATE_SEND_BIT_6;
+
+                                when STATE_SEND_BIT_6 =>
+                                        SER_OUT <= DATUM(6); 
+                                        STATE <= STATE_SEND_BIT_7;
+                                        
+                                when STATE_SEND_BIT_7 =>
+                                        SER_OUT <= DATUM(7); 
+                                        STATE <= STATE_END;
+
+                                when STATE_END =>
+                                        SER_OUT <= '0';
+                                        STATE <= STATE_SEND;
+
+                                when others => STATE <= STATE_END;
+                        end case;
+                    end if; -- COUNT
+                end if; -- RESET ... / PSC_ENABLE ...
+        end if; -- PCI_CLOCK ...
+end process;
+
+process(PCI_CLOCK)
+begin
+        if (PCI_CLOCK'event and PCI_CLOCK = '1') then
+						SYNC <= SPC_RDY_IN;
+				end if;
+end process;
+
+
+end architecture PAR_SER_CON_DESIGN;