Forum Discussion
Altera_Forum
Honored Contributor
Honored ContributorNumber of gates ?
Hi all.
From the datasheet i got from internet for FPGA Cyclone IV (EP4CE6E22I7N) do not mention the number of gates. What does its means? If compared with flex 6000 family(EPF6016TI144-3), its do mentioned the number of gates but not the total RAM bits. It's like vice versa between the two FPGA. Can someone explains it to me please. Is it related between number of gates with total number of RAM? p/s : Attached is a comparaison i made between 3 FPGA (i need to replace the left one) Thanks and Regards13 Replies
Altera_ForumIt is not unlimited, but different designs may have different "max gates" just by the way they are designed. The important figure is the LUT usage.
For RAM - FPGAs have built in rams that are separate from the LUTs. but they can also be configered to use LUTs as ram. Total memory bits also includes max LUT ram uage IIRC. But its not as simple as total bits, as usage can be affected by how efficiently you use the rams in your design. A more sensible question to ask would be what your project is? often it is the IOs needed, memory requirements or built in multiplier requirements that drive the FPGA choice rather than LUT usage (as the others are a lot easier to calculate before you implement your design).- Altera_Forum
Hi and thanks for your answer.
Does it means there is no limitation for the number of gates? or how does it go? How about the total RAM bits? is it reflected with the number of gates? Thanks and regards - Altera_Forum
FPGAs for a long time have used multiple input LUTs. Each LUT can be configured to contain between one and several "gates", so the total gate count is pretty meaningless.
