Use Block RAM & ROM in FPGA

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rezvania

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Hello everyone
I want to use block RAM & ROM without using IP cores. Can I do it? if yes how can I do it?
Thanks for your responses
 

Thanks,
But when I active using DSP48A cores (in SP6) it consume 450 DSP core from 50 totally core! and when I choose "Automatic", it doesn't use it. also I choose using of RAM and ROM but it doesn't use them. I must change in my code or I do other things? Thank you again
 

for example I use array for a ROM.
PHP: 
type ROM is  array (3 downto 0) of std_logic_vector(7 downto 0) := 
x"12",x"a3",x"b0", x"12";

and I want to implement this array by block ROM or RAM. But I don't know how to do this by XST. Could you help me?
 

thats not a rom, its not even correct VHDL (a type declaration cannot be initialised). Post the full code
 

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