Need VHDL memory managing example

[555lin]

Guys, I've encountered a problem of creating and managing a RAM.
Could you please give an example of using a memory to store 256 bits
of data, for example, a key, and managing with write enable, clk signals.

 

[Iouri]

VHDL memory example

you can use signal declaration

signal key: std_logic_vector(255 downto 0);

to write

key(4) <= din_bit

to read

dout_bit <= key(8)

something like this