-- 0x00000000: Main memory (1 MB)
-- 0xc0002000: UART0 (for host communication)
entity soc is
- generic (
- MEMORY_SIZE : positive;
- RAM_INIT_FILE : string;
- RESET_LOW : boolean
+ generic (
+ MEMORY_SIZE : positive;
+ RAM_INIT_FILE : string;
+ RESET_LOW : boolean
);
- port(
- rst : in std_ulogic;
- system_clk : in std_logic;
+ port(
+ rst : in std_ulogic;
+ system_clk : in std_logic;
- -- UART0 signals:
- uart0_txd : out std_logic;
- uart0_rxd : in std_logic
+ -- UART0 signals:
+ uart0_txd : out std_logic;
+ uart0_rxd : in std_logic
);
end entity soc;
architecture behaviour of soc is
- -- wishbone signals:
- signal wishbone_proc_out: wishbone_master_out;
- signal wishbone_proc_in: wishbone_slave_out;
-
- -- Processor signals:
- signal processor_adr_out : std_logic_vector(63 downto 0);
- signal processor_sel_out : std_logic_vector(7 downto 0);
- signal processor_cyc_out : std_logic;
- signal processor_stb_out : std_logic;
- signal processor_we_out : std_logic;
- signal processor_dat_out : std_logic_vector(63 downto 0);
- signal processor_dat_in : std_logic_vector(63 downto 0);
- signal processor_ack_in : std_logic;
-
- -- UART0 signals:
- signal uart0_adr_in : std_logic_vector(11 downto 0);
- signal uart0_dat_in : std_logic_vector( 7 downto 0);
- signal uart0_dat_out : std_logic_vector( 7 downto 0);
- signal uart0_cyc_in : std_logic;
- signal uart0_stb_in : std_logic;
- signal uart0_we_in : std_logic;
- signal uart0_ack_out : std_logic;
-
- -- Main memory signals:
- signal main_memory_adr_in : std_logic_vector(positive(ceil(log2(real(MEMORY_SIZE))))-1 downto 0);
- signal main_memory_dat_in : std_logic_vector(63 downto 0);
- signal main_memory_dat_out : std_logic_vector(63 downto 0);
- signal main_memory_cyc_in : std_logic;
- signal main_memory_stb_in : std_logic;
- signal main_memory_sel_in : std_logic_vector(7 downto 0);
- signal main_memory_we_in : std_logic;
- signal main_memory_ack_out : std_logic;
-
- -- Selected peripheral on the interconnect:
- type intercon_peripheral_type is (
- PERIPHERAL_UART0, PERIPHERAL_MAIN_MEMORY, PERIPHERAL_ERROR,
- PERIPHERAL_NONE);
- signal intercon_peripheral : intercon_peripheral_type := PERIPHERAL_NONE;
-
- -- Interconnect address decoder state:
- signal intercon_busy : boolean := false;
+ -- wishbone signals:
+ signal wishbone_proc_out: wishbone_master_out;
+ signal wishbone_proc_in: wishbone_slave_out;
+
+ -- Processor signals:
+ signal processor_adr_out : std_logic_vector(63 downto 0);
+ signal processor_sel_out : std_logic_vector(7 downto 0);
+ signal processor_cyc_out : std_logic;
+ signal processor_stb_out : std_logic;
+ signal processor_we_out : std_logic;
+ signal processor_dat_out : std_logic_vector(63 downto 0);
+ signal processor_dat_in : std_logic_vector(63 downto 0);
+ signal processor_ack_in : std_logic;
+
+ -- UART0 signals:
+ signal uart0_adr_in : std_logic_vector(11 downto 0);
+ signal uart0_dat_in : std_logic_vector( 7 downto 0);
+ signal uart0_dat_out : std_logic_vector( 7 downto 0);
+ signal uart0_cyc_in : std_logic;
+ signal uart0_stb_in : std_logic;
+ signal uart0_we_in : std_logic;
+ signal uart0_ack_out : std_logic;
+
+ -- Main memory signals:
+ signal main_memory_adr_in : std_logic_vector(positive(ceil(log2(real(MEMORY_SIZE))))-1 downto 0);
+ signal main_memory_dat_in : std_logic_vector(63 downto 0);
+ signal main_memory_dat_out : std_logic_vector(63 downto 0);
+ signal main_memory_cyc_in : std_logic;
+ signal main_memory_stb_in : std_logic;
+ signal main_memory_sel_in : std_logic_vector(7 downto 0);
+ signal main_memory_we_in : std_logic;
+ signal main_memory_ack_out : std_logic;
+
+ -- Selected peripheral on the interconnect:
+ type intercon_peripheral_type is (
+ PERIPHERAL_UART0, PERIPHERAL_MAIN_MEMORY, PERIPHERAL_ERROR,
+ PERIPHERAL_NONE);
+ signal intercon_peripheral : intercon_peripheral_type := PERIPHERAL_NONE;
+
+ -- Interconnect address decoder state:
+ signal intercon_busy : boolean := false;
begin
address_decoder: process(system_clk)
- begin
- if rising_edge(system_clk) then
- if rst = '1' then
- intercon_peripheral <= PERIPHERAL_NONE;
- intercon_busy <= false;
+ begin
+ if rising_edge(system_clk) then
+ if rst = '1' then
+ intercon_peripheral <= PERIPHERAL_NONE;
+ intercon_busy <= false;
+ else
+ if not intercon_busy then
+ if processor_cyc_out = '1' then
+ intercon_busy <= true;
+
+ if processor_adr_out(31 downto 24) = x"00" then -- Main memory space
+ intercon_peripheral <= PERIPHERAL_MAIN_MEMORY;
+ elsif processor_adr_out(31 downto 24) = x"c0" then -- Peripheral memory space
+ case processor_adr_out(15 downto 12) is
+ when x"2" =>
+ intercon_peripheral <= PERIPHERAL_UART0;
+ when others => -- Invalid address - delegated to the error peripheral
+ intercon_peripheral <= PERIPHERAL_ERROR;
+ end case;
else
- if not intercon_busy then
- if processor_cyc_out = '1' then
- intercon_busy <= true;
-
- if processor_adr_out(31 downto 24) = x"00" then -- Main memory space
- intercon_peripheral <= PERIPHERAL_MAIN_MEMORY;
- elsif processor_adr_out(31 downto 24) = x"c0" then -- Peripheral memory space
- case processor_adr_out(15 downto 12) is
- when x"2" =>
- intercon_peripheral <= PERIPHERAL_UART0;
- when others => -- Invalid address - delegated to the error peripheral
- intercon_peripheral <= PERIPHERAL_ERROR;
- end case;
- else
- intercon_peripheral <= PERIPHERAL_ERROR;
- end if;
- else
- intercon_peripheral <= PERIPHERAL_NONE;
- end if;
- else
- if processor_cyc_out = '0' then
- intercon_busy <= false;
- intercon_peripheral <= PERIPHERAL_NONE;
- end if;
- end if;
+ intercon_peripheral <= PERIPHERAL_ERROR;
end if;
+ else
+ intercon_peripheral <= PERIPHERAL_NONE;
+ end if;
+ else
+ if processor_cyc_out = '0' then
+ intercon_busy <= false;
+ intercon_peripheral <= PERIPHERAL_NONE;
+ end if;
end if;
- end process address_decoder;
-
- processor_intercon: process(all)
- begin
- case intercon_peripheral is
- when PERIPHERAL_UART0 =>
- processor_ack_in <= uart0_ack_out;
- processor_dat_in <= x"00000000000000" & uart0_dat_out;
- when PERIPHERAL_MAIN_MEMORY =>
- processor_ack_in <= main_memory_ack_out;
- processor_dat_in <= main_memory_dat_out;
- when PERIPHERAL_NONE =>
- processor_ack_in <= '0';
- processor_dat_in <= (others => '0');
- when others =>
- processor_ack_in <= '0';
- processor_dat_in <= (others => '0');
- end case;
- end process processor_intercon;
-
- processor: entity work.core
- port map(
- clk => system_clk,
- rst => rst,
-
- wishbone_out => wishbone_proc_out,
- wishbone_in => wishbone_proc_in
- );
- processor_adr_out <= wishbone_proc_out.adr;
- processor_dat_out <= wishbone_proc_out.dat;
- processor_sel_out <= wishbone_proc_out.sel;
- processor_cyc_out <= wishbone_proc_out.cyc;
- processor_stb_out <= wishbone_proc_out.stb;
- processor_we_out <= wishbone_proc_out.we;
- wishbone_proc_in.dat <= processor_dat_in;
- wishbone_proc_in.ack <= processor_ack_in;
-
- uart0: entity work.pp_soc_uart
- generic map(
- FIFO_DEPTH => 32
- ) port map(
- clk => system_clk,
- reset => rst,
- txd => uart0_txd,
- rxd => uart0_rxd,
- wb_adr_in => uart0_adr_in,
- wb_dat_in => uart0_dat_in,
- wb_dat_out => uart0_dat_out,
- wb_cyc_in => uart0_cyc_in,
- wb_stb_in => uart0_stb_in,
- wb_we_in => uart0_we_in,
- wb_ack_out => uart0_ack_out
- );
- uart0_adr_in <= processor_adr_out(uart0_adr_in'range);
- uart0_dat_in <= processor_dat_out(7 downto 0);
- uart0_we_in <= processor_we_out;
- uart0_cyc_in <= processor_cyc_out when intercon_peripheral = PERIPHERAL_UART0 else '0';
- uart0_stb_in <= processor_stb_out when intercon_peripheral = PERIPHERAL_UART0 else '0';
-
- main_memory: entity work.pp_soc_memory
- generic map(
- MEMORY_SIZE => MEMORY_SIZE,
- RAM_INIT_FILE => RAM_INIT_FILE
- ) port map(
- clk => system_clk,
- reset => rst,
- wb_adr_in => main_memory_adr_in,
- wb_dat_in => main_memory_dat_in,
- wb_dat_out => main_memory_dat_out,
- wb_cyc_in => main_memory_cyc_in,
- wb_stb_in => main_memory_stb_in,
- wb_sel_in => main_memory_sel_in,
- wb_we_in => main_memory_we_in,
- wb_ack_out => main_memory_ack_out
- );
- main_memory_adr_in <= processor_adr_out(main_memory_adr_in'range);
- main_memory_dat_in <= processor_dat_out;
- main_memory_we_in <= processor_we_out;
- main_memory_sel_in <= processor_sel_out;
- main_memory_cyc_in <= processor_cyc_out when intercon_peripheral = PERIPHERAL_MAIN_MEMORY else '0';
- main_memory_stb_in <= processor_stb_out when intercon_peripheral = PERIPHERAL_MAIN_MEMORY else '0';
-
+ end if;
+ end if;
+ end process address_decoder;
+
+ processor_intercon: process(all)
+ begin
+ case intercon_peripheral is
+ when PERIPHERAL_UART0 =>
+ processor_ack_in <= uart0_ack_out;
+ processor_dat_in <= x"00000000000000" & uart0_dat_out;
+ when PERIPHERAL_MAIN_MEMORY =>
+ processor_ack_in <= main_memory_ack_out;
+ processor_dat_in <= main_memory_dat_out;
+ when PERIPHERAL_NONE =>
+ processor_ack_in <= '0';
+ processor_dat_in <= (others => '0');
+ when others =>
+ processor_ack_in <= '0';
+ processor_dat_in <= (others => '0');
+ end case;
+ end process processor_intercon;
+
+ processor: entity work.core
+ port map(
+ clk => system_clk,
+ rst => rst,
+
+ wishbone_out => wishbone_proc_out,
+ wishbone_in => wishbone_proc_in
+ );
+ processor_adr_out <= wishbone_proc_out.adr;
+ processor_dat_out <= wishbone_proc_out.dat;
+ processor_sel_out <= wishbone_proc_out.sel;
+ processor_cyc_out <= wishbone_proc_out.cyc;
+ processor_stb_out <= wishbone_proc_out.stb;
+ processor_we_out <= wishbone_proc_out.we;
+ wishbone_proc_in.dat <= processor_dat_in;
+ wishbone_proc_in.ack <= processor_ack_in;
+
+ uart0: entity work.pp_soc_uart
+ generic map(
+ FIFO_DEPTH => 32
+ )
+ port map(
+ clk => system_clk,
+ reset => rst,
+ txd => uart0_txd,
+ rxd => uart0_rxd,
+ wb_adr_in => uart0_adr_in,
+ wb_dat_in => uart0_dat_in,
+ wb_dat_out => uart0_dat_out,
+ wb_cyc_in => uart0_cyc_in,
+ wb_stb_in => uart0_stb_in,
+ wb_we_in => uart0_we_in,
+ wb_ack_out => uart0_ack_out
+ );
+ uart0_adr_in <= processor_adr_out(uart0_adr_in'range);
+ uart0_dat_in <= processor_dat_out(7 downto 0);
+ uart0_we_in <= processor_we_out;
+ uart0_cyc_in <= processor_cyc_out when intercon_peripheral = PERIPHERAL_UART0 else '0';
+ uart0_stb_in <= processor_stb_out when intercon_peripheral = PERIPHERAL_UART0 else '0';
+
+ main_memory: entity work.pp_soc_memory
+ generic map(
+ MEMORY_SIZE => MEMORY_SIZE,
+ RAM_INIT_FILE => RAM_INIT_FILE
+ )
+ port map(
+ clk => system_clk,
+ reset => rst,
+ wb_adr_in => main_memory_adr_in,
+ wb_dat_in => main_memory_dat_in,
+ wb_dat_out => main_memory_dat_out,
+ wb_cyc_in => main_memory_cyc_in,
+ wb_stb_in => main_memory_stb_in,
+ wb_sel_in => main_memory_sel_in,
+ wb_we_in => main_memory_we_in,
+ wb_ack_out => main_memory_ack_out
+ );
+ main_memory_adr_in <= processor_adr_out(main_memory_adr_in'range);
+ main_memory_dat_in <= processor_dat_out;
+ main_memory_we_in <= processor_we_out;
+ main_memory_sel_in <= processor_sel_out;
+ main_memory_cyc_in <= processor_cyc_out when
+ intercon_peripheral = PERIPHERAL_MAIN_MEMORY else '0';
+ main_memory_stb_in <= processor_stb_out when
+ intercon_peripheral = PERIPHERAL_MAIN_MEMORY else '0';
+
end architecture behaviour;
projects / microwatt.git / commitdiff