PoC.io.lcd.dotmatrix¶

entity lcd_dotmatrix is
  generic(
    CLOCK_FREQ : FREQ;
    DATA_WIDTH : positive;          -- Width of data bus (4 or 8)
    
    T_W        : time     :=  500 ns; -- Minimum width of E pulse
    T_SU       : time     :=   60 ns; -- Minimum RS + R/W setup time
    T_H        : time     :=   20 ns; -- Minimum RS + R/W hole time
    T_C        : time     := 1000 ns; -- Minimum cycle time
    
    B_RECOVER_TIME : time := 5 us  -- Recover time after cleared Busy flag
  );
  port(
    -- Global Reset and Clock
    clk, rst : in std_logic;
    
    skip_bf : in std_logic := '0';      -- Skip test for cleared busy flag
    
    -- Upper Layer Interface
    rdy : out std_logic;                     -- ready for command or data
    stb : in  std_logic;                     -- input strobe
    cmd : in  std_logic;                     -- command / no data selector
    dat : in  std_logic_vector(7 downto 0);  -- command or data word
    
    -- LCD Connections
    lcd_e     : out std_logic;  -- Enable
    lcd_rs    : out std_logic;  -- Register Select
    lcd_rw    : out std_logic;  -- Read /Write, Data Direction Selector
    lcd_dat_i : in  std_logic_vector(DATA_WIDTH-1 downto 0);  -- Data Input
    lcd_dat_o : out std_logic_vector(DATA_WIDTH-1 downto 0)   -- Data Output
  );
end entity;