Hello,
I am just now learning VHDL and am wondering how I work write code to use one single 8bit in/out pins, which is mapped to 4 internal 8bit registers, which can either be read or written too. It of course would has a 2 bit address select. I know how to do the entity declaration, I'm not quite sure how to do the arch process. Here is what I am thinking, please tell me if I am doing this wrong.
Note also that this is just an example on not my actual project.
entity myMemory is port (Clk : in std_logic; DataIo :inout std_logic_vector (7 downto 0) Bus :=(others=>'Z'); OutEn : in std_logic_vector; --Enables the output buffers. Write : in std_logic; --Write to memory " Active low" Read : in std_logic; --Read from memory "Active low" Addr : in std_logic_vector (1 downto 0)); end myMemory; architecture Behavioral of myMemory is signal Reg0 : std_logic_vector (7 downto 0); signal Reg1 : std_logic_vector (7 downto 0); signal Reg2 : std_logic_vector (7 downto 0); signal Reg3 : std_logic_vector (7 downto 0); begin process(Clk) begin if(Clk'event and Clk='1') then case Addr is when "00"=>
if(Read='0' and Write='1' and 'OutEn='1') then DataIo