May FIFO be read and writen simultaneously ?

[vvsvv]

FIFO was made by BlockRAM out of Spartan2 (xilinx) ,
may this FIFO be read and be writen at the same time ?

thanks.

 

[it_boy]

Spartan2 block rams are true dual port memories.
So, fifo can be designed which can be read/written simultaneously.

 

[cube007]

Spartan2 block rams are true dual port memories.
So, fifo can be designed which can be read/written simultaneously.

Just to clarify: It is not possible to read/write from/to the same address at the same time. Of course there is no FIFO implementation which supports this useless mode.

 

[guybrush]

You can read the fifo while writing if the number of word in the fifo is greater than one. When the fifo has one only word, there is the risk of collision of the read and write address.

 

[maestor]

Hi,

Yeah, Fifos based in BlockRAM can be read and write simultaneously, synchronous and asynchronous ones.

You have to monitor the 'empty' signal before popping out the next word and that's it.

Just bear in mind that writting an async Fifo is not trivial (sync is peanuts).

-maestor