Reply by Nicholas Paul Collin Gloucester●May 13, 20092009-05-13
On 2009-05-11, hamze60 <hamze60@gmail.com> wrote:
|----------------------------------------------------------------------|
|"I want to design a space system and don't want to use airspace |
|expensive fpga. considering space radiation I want to make this system|
|fault tolerant. ACTEL is flash-based but in program lost condition |
|( even with low probability ) it should be reprogrammed so a |
|programing circuit is also needed. Xilinx or Altera are RAMbased but |
|they have very small size EPROMs to store both hardware configuration |
|and software, so using multiple of EPROMs is possible for redundancy. |
|can anybody suggest better solution or even a new idea?" |
|----------------------------------------------------------------------|
If you can trust yourself enough to not need a reconfigurable FPGA,
then consider
HTTP://AMS.Aeroflex.com/ProductPages/RH_fpga.cfm
Reply by Jacko●May 11, 20092009-05-11
On May 11, 11:06=A0am, hamze60 <hamz...@gmail.com> wrote:
> I want to design a space system and don't want to use airspace
> expensive fpga. considering space radiation I want to make this system
> fault tolerant. ACTEL is flash-based but in program lost condition
> ( even with low probability ) it should be reprogrammed so a
> programing circuit is also needed. Xilinx or Altera are RAMbased but
> they have very small size EPROMs to store both hardware configuration
> and software, so using multiple of EPROMs is possible for redundancy.
> can anybody suggest better solution or even a new idea?
How about quad redundancy. Each system quarter is design as a unified
singular design, and the 3 join ports are added. The majority
selection of status from the 3 join ports are compared to the actual
system quarter information, and an error causes a reload and copy
cycle.
The system join port has to be wide enough to encompass all the
registered memory, or has to have a reload interleave presenting this
memory/register information in a know addressed order. In this sense
it does not matter what is done to restart the failed system quarter,
just that it will be in error until it has reloaded, and may be
restarted in sync.
cheers jacko
Reply by ●May 11, 20092009-05-11
On May 11, 6:06=A0am, hamze60 <hamz...@gmail.com> wrote:
> I want to design a space system and don't want to use airspace
> expensive fpga
I guess there probably are FPGA's on the market whose value exceeds
the launch cost of their mass...
Reply by Allan Herriman●May 11, 20092009-05-11
On Mon, 11 May 2009 03:06:21 -0700, hamze60 wrote:
> I want to design a space system and don't want to use airspace expensive
> fpga. considering space radiation I want to make this system fault
> tolerant. ACTEL is flash-based but in program lost condition ( even with
> low probability ) it should be reprogrammed so a programing circuit is
> also needed. Xilinx or Altera are RAMbased but they have very small size
> EPROMs to store both hardware configuration and software, so using
> multiple of EPROMs is possible for redundancy. can anybody suggest
> better solution or even a new idea?
I want to design a space system and don't want to use airspace
expensive fpga. considering space radiation I want to make this system
fault tolerant. ACTEL is flash-based but in program lost condition
( even with low probability ) it should be reprogrammed so a
programing circuit is also needed. Xilinx or Altera are RAMbased but
they have very small size EPROMs to store both hardware configuration
and software, so using multiple of EPROMs is possible for redundancy.
can anybody suggest better solution or even a new idea?