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library ieee;
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_arith.all;
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use ieee.std_logic_arith.all;
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use ieee.std_logic_unsigned.all;
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use ieee.std_logic_unsigned.all;
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use work.mips_pkg.all; -- Only needed if port debug_info is not OPEN
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-- FPGA i/o for Terasic DE-1 board
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-- FPGA i/o for Terasic DE-1 board
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-- (Many of the board's i/o devices will go unused in this demo)
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-- (Many of the board's i/o devices will go unused in this demo)
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entity c2sb_demo is
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entity c2sb_demo is
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port (
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port (
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signal mpu_sram_data_rd : std_logic_vector(15 downto 0);
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signal mpu_sram_data_rd : std_logic_vector(15 downto 0);
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signal mpu_sram_data_wr : std_logic_vector(15 downto 0);
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signal mpu_sram_data_wr : std_logic_vector(15 downto 0);
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signal mpu_sram_byte_we_n : std_logic_vector(1 downto 0);
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signal mpu_sram_byte_we_n : std_logic_vector(1 downto 0);
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signal mpu_sram_oe_n : std_logic;
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signal mpu_sram_oe_n : std_logic;
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signal debug_info : t_debug_info;
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-- Converts hex nibble to 7-segment
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-- Converts hex nibble to 7-segment
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-- Segments ordered as "GFEDCBA"; '0' is ON, '1' is OFF
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-- Segments ordered as "GFEDCBA"; '0' is ON, '1' is OFF
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function nibble_to_7seg(nibble : std_logic_vector(3 downto 0))
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function nibble_to_7seg(nibble : std_logic_vector(3 downto 0))
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return std_logic_vector is
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return std_logic_vector is
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begin
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begin
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sram_oe_n => mpu_sram_oe_n,
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sram_oe_n => mpu_sram_oe_n,
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uart_rxd => rxd,
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uart_rxd => rxd,
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uart_txd => txd,
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uart_txd => txd,
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debug_info => debug_info,
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clk => clk,
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clk => clk,
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reset => reset
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reset => reset
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);
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);
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io_rd_data(31 downto 22) <= switches;
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io_rd_data(31 downto 22) <= switches;
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-- red leds (light with '1') -- some CPU control signals
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-- red leds (light with '1') -- some CPU control signals
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red_leds(0) <= '0';
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red_leds(0) <= debug_info.cache_enabled;
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red_leds(1) <= '0';
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red_leds(1) <= debug_info.unmapped_access;
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red_leds(2) <= '0';
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red_leds(2) <= '0';
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red_leds(3) <= '0';
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red_leds(3) <= '0';
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red_leds(4) <= '0';
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red_leds(4) <= '0';
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red_leds(5) <= '0';
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red_leds(5) <= '0';
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red_leds(6) <= '0';
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red_leds(6) <= '0';
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