ALTSYNCRAM vs ALTDPRAM

[manojkhandelwal]

Hi,
reading data sheets is not helping, so can anyone please explain the difference between "altsyncram" and "altdpram" ?

Thanks,
manoj

 

[FvM]

Asuming you are referring to Altera block RAM IP ("MegaFunctions"), both are just aliases for the same library.

 

[manojkhandelwal]

Hi FvM,
Thanks for such early reply!!!!

Now,do they have something to do with synchronous and asynchronous RAM...
i mean to say that ALTSYNCRAM refers to synchronous ram and ALTDPRAM refers to an asynchronous one.....?
or both refers to synchronous RAM.......there must be some difference..

Thanks in advance,
Mnaoj

 

[TrickyDicky]

all rams in fpga are synchronous

 

[manojkhandelwal]

oh sorry, i mean to say synchronous read and asynchronous read...

 

[FvM]

You need to refer to hardware properties of the respective FPGA family. The libraries can only provide existing hardware functionality. With Altera all block RAM uses registered read addresses, in so far reads are synchronous.

Some FPGA families are however offering limited capacity of MLAB RAM, which is actually implemented in logic cell LUTs. It offers asynchronous operation as an option, if I remember right.