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Commit	Line	Data
	1	-- $Id: ser_par_con.vhd,v 1.1 2007-03-11 08:55:29 sithglan Exp $
	2
	3	library ieee;
	4	use ieee.std_logic_1164.all;
	5	use ieee.std_logic_unsigned.all;
	6
	7	entity SER_PAR_CON is
	8	port
	9	(
	10	PCI_CLOCK :in std_logic;
	11	RESET :in std_logic;
	12	SPC_ENABLE :in std_logic; -- Driver Enable Sender/Receiver
	13	SYNC_R_FIFO_FFn :in std_logic; -- FIFO Full Flag (low active)
	14	SERIAL_IN :in std_logic; -- Serial Input
	15	R_FIFO_WRITEn :out std_logic; -- FIFO Write (low active)
	16	SPC_RDY_OUT :out std_logic; -- Ready to Receive Data
	17	PAR_OUT :out std_logic_vector(7 downto 0)
	18	);
	19	end entity SER_PAR_CON;
	20
	21
	22	architecture SER_PAR_CON_DESIGN of SER_PAR_CON is
	23
	24	-- constant STATE_RECV :std_logic_vector(3 downto 0) := "0001";
	25	constant STATE_RECV_START_BIT :std_logic_vector(3 downto 0) := "0010";
	26	constant STATE_RECV_BIT_0 :std_logic_vector(3 downto 0) := "0011";
	27	constant STATE_RECV_BIT_1 :std_logic_vector(3 downto 0) := "0100";
	28	constant STATE_RECV_BIT_2 :std_logic_vector(3 downto 0) := "0101";
	29	constant STATE_RECV_BIT_3 :std_logic_vector(3 downto 0) := "0110";
	30	constant STATE_RECV_BIT_4 :std_logic_vector(3 downto 0) := "0111";
	31	constant STATE_RECV_BIT_5 :std_logic_vector(3 downto 0) := "1000";
	32	constant STATE_RECV_BIT_6 :std_logic_vector(3 downto 0) := "1001";
	33	constant STATE_RECV_BIT_7 :std_logic_vector(3 downto 0) := "1010";
	34	constant STATE_RECV_FIFOFULL :std_logic_vector(3 downto 0) := "1011";
	35
	36	signal COUNT :std_logic_vector (3 downto 0);
	37	signal STATE :std_logic_vector (3 downto 0);
	38	signal STARTBIT :std_logic_vector (3 downto 0);
	39
	40
	41	attribute syn_state_machine:boolean;
	42	attribute syn_state_machine of STATE: signal is false;
	43	attribute syn_state_machine of COUNT: signal is false;
	44
	45	begin
	46
	47	process(PCI_CLOCK)
	48	begin
	49	if (PCI_CLOCK'event and PCI_CLOCK = '1') then
	50	if ("0000" < COUNT) then
	51	COUNT <= COUNT - 1;
	52	end if;
	53
	54	-- war nicht das Problem des Datenverlusts
	55	-- if (R_FIFO_WRITEn = '0' and COUNT = "0000") then
	56	-- R_FIFO_WRITEn <= '1';
	57	--- end if;
	58
	59	if (RESET = '1') then
	60	STATE <= STATE_RECV_START_BIT;
	61	COUNT <= "0000";
	62	R_FIFO_WRITEn <= '1';
	63
	64	elsif (SPC_ENABLE = '1') then
	65
	66	if (STATE = STATE_RECV_START_BIT) then
	67	R_FIFO_WRITEn <= '1';
	68	if (STARTBIT = "0011") then
	69	COUNT <= "0011";
	70	STATE <= STATE_RECV_BIT_0;
	71	end if;
	72
	73	elsif (STATE = STATE_RECV_FIFOFULL) then
	74	if (SYNC_R_FIFO_FFn = '1') then
	75	R_FIFO_WRITEn <= '0';
	76	STATE <= STATE_RECV_START_BIT;
	77	end if;
	78
	79	elsif (COUNT = "0000") then
	80	COUNT <= "0011";
	81	case STATE is
	82
	83	when STATE_RECV_BIT_0 =>
	84	PAR_OUT(0) <= STARTBIT(0);
	85	STATE <= STATE_RECV_BIT_1;
	86
	87	when STATE_RECV_BIT_1 =>
	88	PAR_OUT(1) <= STARTBIT(0);
	89	STATE <= STATE_RECV_BIT_2;
	90
	91	when STATE_RECV_BIT_2 =>
	92	PAR_OUT(2) <= STARTBIT(0);
	93	STATE <= STATE_RECV_BIT_3;
	94
	95	when STATE_RECV_BIT_3 =>
	96	PAR_OUT(3) <= STARTBIT(0);
	97	STATE <= STATE_RECV_BIT_4;
	98
	99	when STATE_RECV_BIT_4 =>
	100	PAR_OUT(4) <= STARTBIT(0);
	101	STATE <= STATE_RECV_BIT_5;
	102
	103	when STATE_RECV_BIT_5 =>
	104	PAR_OUT(5) <= STARTBIT(0);
	105	STATE <= STATE_RECV_BIT_6;
	106
	107	when STATE_RECV_BIT_6 =>
	108	PAR_OUT(6) <= STARTBIT(0);
	109	STATE <= STATE_RECV_BIT_7;
	110
	111	when STATE_RECV_BIT_7 =>
	112	PAR_OUT(7) <= STARTBIT(0);
	113
	114	if (SYNC_R_FIFO_FFn = '1') then
	115	STATE <= STATE_RECV_START_BIT;
	116	R_FIFO_WRITEn <= '0';
	117	else
	118	STATE <= STATE_RECV_FIFOFULL;
	119	end if;
	120
	121	when others =>
	122	STATE <= STATE_RECV_START_BIT;
	123
	124	end case;
	125	end if; -- COUNT
	126	end if; -- RESET ... / SPC_ENABLE ...
	127	end if; -- PCI_CLOCK ...
	128	end process;
	129
	130	process(PCI_CLOCK)
	131	begin
	132	if (PCI_CLOCK'event and PCI_CLOCK = '1') then
	133	SPC_RDY_OUT <= SPC_ENABLE AND SYNC_R_FIFO_FFn;
	134	end if;
	135	end process;
	136
	137
	138	process(PCI_CLOCK)
	139	begin
	140	if (PCI_CLOCK'event and PCI_CLOCK = '1') then
	141	if (RESET = '1') then
	142	STARTBIT <= "0000";
	143	else
	144	STARTBIT(0) <= SERIAL_IN;
	145	STARTBIT(1) <= STARTBIT(0);
	146	STARTBIT(2) <= STARTBIT(1);
	147	STARTBIT(3) <= STARTBIT(2);
	148	end if;
	149	end if;
	150	end process;
	151
	152	end architecture SER_PAR_CON_DESIGN;