---**********************************************************
---*** 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 ;