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Forum: FPGA, VHDL & Verilog RAMs and ROMs on FPGA Boards


Author: Ario Kian (ario_kian)
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there are different kinds of RAMs like SDRAMs ans ROMs like EEPROM on 
FPGA boards , why ?
FPGAs have these memories inside of them , why there are more Memories 
on Boards?

Author: Achim S. (Guest)
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Ario K. wrote:
> there are different kinds of RAMs like SDRAMs ans ROMs like EEPROM on
> FPGA boards , why ?

cause different kinds of applications require different kinds of memory 
(different capacity, different bandwidth, different data retention, ...)

Ario K. wrote:
> FPGAs have these memories inside of them , why there are more Memories
> on Boards?

for those applications, where the FPGA-internal memory is not sufficient 
(typically insufficient capacity).

Author: Lothar Miller (lkmiller) (Moderator)
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Ario K. wrote:
> there are different kinds of RAMs like SDRAMs ans ROMs like EEPROM on
> FPGA boards , why ?
Different requierements for storage...
Even your mobile phone and your tablet or your PC have different kind of 
memories: RAM, ROM, FLASH, Memory-Cards, Memory-Sticks, ...

> FPGAs have these memories inside of them , why there are more Memories
> on Boards?
Memory inside a FPGA is usually SRAM based. SRAM is volatile memoy and 
it is expensive memory (lots of transistors per bit). Memory outside the 
FPGA can be larger, cheaper and it could be permanent/non-volatile.

: Edited by Moderator

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