--- J.STELZNER\r
--- INFORMATIK-3 LABOR\r
--- 23.08.2006\r
--- File: COMM_FSM.VHD\r
-\r
-library ieee;\r
-use ieee.std_logic_1164.all ;\r
-\r
-entity COMM_FSM is\r
- port\r
- (\r
- PCI_CLOCK :in std_logic; \r
- PCI_RSTn :in std_logic; \r
- IO_READ :in std_logic;\r
- IO_WRITE :in std_logic;\r
- CONF_READ :in std_logic;\r
- CONF_WRITE :in std_logic;\r
- DEVSELn :in std_logic; \r
-\r
- IO_RD_COM : out std_logic;--> MUX_SEL(0) \r
- CF_RD_COM :out std_logic; \r
- IO_WR_COM :out std_logic; \r
- CF_WR_COM :out std_logic \r
- );\r
-end entity COMM_FSM ;\r
-\r
-architecture COMM_FSM_DESIGN of COMM_FSM is\r
-\r
-\r
---**********************************************************\r
---*** COMMAND FSM CODIERUNG ***\r
---**********************************************************\r
---\r
---\r
--- |--------- IO_RD_COM \r
--- ||-------- CF_RD_COM \r
--- |||------- IO_WR_COM \r
--- ||||------ CF_WR_COM \r
--- |||| \r
- constant ST_IDLE_COMM :std_logic_vector (3 downto 0) := "0000" ;-- \r
- constant ST_CONF_WRITE :std_logic_vector (3 downto 0) := "0001" ;-- \r
- constant ST_IO_WRITE :std_logic_vector (3 downto 0) := "0010" ;-- \r
- constant ST_CONF_READ :std_logic_vector (3 downto 0) := "0100" ;-- \r
- constant ST_IO_READ :std_logic_vector (3 downto 0) := "1000" ;--\r
-\r
- signal COMM_STATE :std_logic_vector (3 downto 0);\r
-\r
---************************************************************\r
---*** FSM SPEICHER-AUTOMAT ***\r
---************************************************************\r
-\r
- attribute syn_state_machine : boolean;\r
- attribute syn_state_machine of COMM_STATE : signal is false;\r
-\r
-begin\r
-\r
---**********************************************************\r
---*** COMMAND FSM ***\r
---**********************************************************\r
-\r
- process (PCI_CLOCK, PCI_RSTn) \r
- begin\r
- if PCI_RSTn = '0' then COMM_STATE <= "0000";\r
-\r
- elsif (PCI_CLOCK'event and PCI_CLOCK = '1') then\r
- \r
- case COMM_STATE is\r
- \r
- when ST_IDLE_COMM => \r
- if IO_READ = '1' then COMM_STATE <= ST_IO_READ;\r
-\r
- elsif CONF_READ = '1' then COMM_STATE <= ST_CONF_READ; \r
-\r
- elsif IO_WRITE = '1' then COMM_STATE <= ST_IO_WRITE; \r
- \r
- elsif CONF_WRITE = '1' then COMM_STATE <= ST_CONF_WRITE; \r
-\r
- else COMM_STATE <= ST_IDLE_COMM;\r
- end if; \r
- \r
- when ST_IO_READ => if DEVSELn = '1' then COMM_STATE <= ST_IDLE_COMM; end if; \r
- when ST_CONF_READ => if DEVSELn = '1' then COMM_STATE <= ST_IDLE_COMM; end if; \r
- when ST_IO_WRITE => if DEVSELn = '1' then COMM_STATE <= ST_IDLE_COMM; end if; \r
- when ST_CONF_WRITE => if DEVSELn = '1' then COMM_STATE <= ST_IDLE_COMM; end if;\r
- \r
- when others => COMM_STATE <= ST_IDLE_COMM; \r
-\r
- end case; -- COMM_STATE \r
- end if; -- CLOCK \r
- end process; -- PROCESS\r
-\r
- IO_RD_COM <= COMM_STATE(3); \r
- CF_RD_COM <= COMM_STATE(2); \r
- IO_WR_COM <= COMM_STATE(1); \r
- CF_WR_COM <= COMM_STATE(0); \r
- \r
-end architecture COMM_FSM_DESIGN ;\r
-\r
+-- J.STELZNER
+-- INFORMATIK-3 LABOR
+-- 23.08.2006
+-- File: COMM_FSM.VHD
+
+library ieee;
+use ieee.std_logic_1164.all ;
+
+entity COMM_FSM is
+ port
+ (
+ PCI_CLOCK :in std_logic;
+ PCI_RSTn :in std_logic;
+ IO_READ :in std_logic;
+ IO_WRITE :in std_logic;
+ CONF_READ :in std_logic;
+ CONF_WRITE :in std_logic;
+ DEVSELn :in std_logic;
+
+ IO_RD_COM : out std_logic;--> MUX_SEL(0)
+ CF_RD_COM :out std_logic;
+ IO_WR_COM :out std_logic;
+ CF_WR_COM :out std_logic
+ );
+end entity COMM_FSM ;
+
+architecture COMM_FSM_DESIGN of COMM_FSM is
+
+
+--**********************************************************
+--*** COMMAND FSM CODIERUNG ***
+--**********************************************************
+--
+--
+-- |--------- IO_RD_COM
+-- ||-------- CF_RD_COM
+-- |||------- IO_WR_COM
+-- ||||------ CF_WR_COM
+-- ||||
+ constant ST_IDLE_COMM :std_logic_vector (3 downto 0) := "0000" ;--
+ constant ST_CONF_WRITE :std_logic_vector (3 downto 0) := "0001" ;--
+ constant ST_IO_WRITE :std_logic_vector (3 downto 0) := "0010" ;--
+ constant ST_CONF_READ :std_logic_vector (3 downto 0) := "0100" ;--
+ constant ST_IO_READ :std_logic_vector (3 downto 0) := "1000" ;--
+
+ signal COMM_STATE :std_logic_vector (3 downto 0);
+
+--************************************************************
+--*** FSM SPEICHER-AUTOMAT ***
+--************************************************************
+
+ attribute syn_state_machine : boolean;
+ attribute syn_state_machine of COMM_STATE : signal is false;
+
+begin
+
+--**********************************************************
+--*** COMMAND FSM ***
+--**********************************************************
+
+ process (PCI_CLOCK, PCI_RSTn)
+ begin
+ if PCI_RSTn = '0' then COMM_STATE <= "0000";
+
+ elsif (PCI_CLOCK'event and PCI_CLOCK = '1') then
+
+ case COMM_STATE is
+
+ when ST_IDLE_COMM =>
+ if IO_READ = '1' then COMM_STATE <= ST_IO_READ;
+
+ elsif CONF_READ = '1' then COMM_STATE <= ST_CONF_READ;
+
+ elsif IO_WRITE = '1' then COMM_STATE <= ST_IO_WRITE;
+
+ elsif CONF_WRITE = '1' then COMM_STATE <= ST_CONF_WRITE;
+
+ else COMM_STATE <= ST_IDLE_COMM;
+ end if;
+
+ when ST_IO_READ => if DEVSELn = '1' then COMM_STATE <= ST_IDLE_COMM; end if;
+ when ST_CONF_READ => if DEVSELn = '1' then COMM_STATE <= ST_IDLE_COMM; end if;
+ when ST_IO_WRITE => if DEVSELn = '1' then COMM_STATE <= ST_IDLE_COMM; end if;
+ when ST_CONF_WRITE => if DEVSELn = '1' then COMM_STATE <= ST_IDLE_COMM; end if;
+
+ when others => COMM_STATE <= ST_IDLE_COMM;
+
+ end case; -- COMM_STATE
+ end if; -- CLOCK
+ end process; -- PROCESS
+
+ IO_RD_COM <= COMM_STATE(3);
+ CF_RD_COM <= COMM_STATE(2);
+ IO_WR_COM <= COMM_STATE(1);
+ CF_WR_COM <= COMM_STATE(0);
+
+end architecture COMM_FSM_DESIGN ;
+
projects / raggedstone / blobdiff