How to create a RAM block without using a clock?

[kalaiyarasan]

Is it possible to create a RAM without using a clock.
thanks in advance

 

[rca]

Re: RAM Block

yes, that's called asynchronous ram

 

[kalaiyarasan]

Re: RAM Block

thanks for ur reply . Is it really possible.
suppose i want to write continuously for more than 5 times. how long i want to make my write enable high.
Is there any possible that junk values enter the memory.
Any synchronization problem. if any means how to solve that

 

[vipinlal]

Re: RAM Block

Dual Port RAM Asynchronous Read/Write

see the above link.It is possible to read/write the RAM without a clock.But the necessary signals like Address,Data_in etc has to be generated and supplied to the RAM block.This will need a clock.

May be you can try something like this(I am not sure about whether it will work or any possible glitches):

type RAM_t is array (0 to 255) of integer;
signal RAM_t : RAM;

process(clk)
..
for i in 0 to 3 loop
RAM(i) <= data_to_be_written(i);
end loop;
end process;

check if 4 values are written to RAM at a time.May be this is a dangerous scheme.But anyway you can check it.