[AR] Re: LEO radiation shielding
- From: Uwe Klein <uwe@xxxxxxxxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Fri, 06 Dec 2019 10:02:24 +0100
Am 06.12.2019 um 06:07 schrieb Henry Spencer:
However, FPGAs don't get you away from "more design work equals more
opportunities for mistakes". There's been at least one spacecraft lost
(the WIRE infrared-astronomy mission) because of FPGA design screwups.
I've been lucky in this respect, 5 designs flown, no burps. :-)
simulation tools are very usefull.
Simulations tend to break on interaction with outside things.
One aspect being simulation of the periphery to be shoddy
or not done at all :-)
A big thing is getting to grips with the design software.
Those have bugs and indiosyncrasies too.
Once you have established a working system and know the bugs
and have worked out methods to go around those ...
shoot anyone who tries to update the software ( this just In NEW!!!!
<pavlov dripping> ) on the devel system.
With the early lattice design software (ISPLSI 1016,24,32 ) Series 1990+)
I found another unpleasant caveat:
The fitter worked better in incremental mode.
Smallish changes on an existing design ( like fixing errors )
would be fitted
while starting the same design from new would founder.
Uwe
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