[AR] Re: Hydrogen, Flying to Orbit with Hydrogen, no, not propane.

  • From: Uwe Klein <uwe@xxxxxxxxxxxxxxxxxxx>
  • To: arocket@xxxxxxxxxxxxx
  • Date: Tue, 24 Dec 2019 09:30:56 +0100

Am 24.12.2019 um 05:54 schrieb Craig Fink:



On Thu, Dec 19, 2019 at 6:50 AM Uwe Klein <uwe@xxxxxxxxxxxxxxxxxxx
    My last big project was MIRO/Rosetta. so Yes and not/less today. :-)


Could we reprogram the MIRO/Rosetta to gather more information?

No.

for the reason up front that the orbiter has been "landed" and decommissioned.
The Wombles: don't litter :-)

in abstract terms because the PGA family used is Anti-Fuse.
i.e. nonvolatile and nonreprogrammable. ( why Xilinx RAM based parts were not used.)

finally that design is not very flexible.
Where the hardware baseline for previous spectrometers
were "rappelwerk" and run by a loadable program code:
mostly switch on/off/trigger commands and single branch instruction.
MIRO ran from a set of counters controlling the measurement cycle.
( and was a 4 path 4 FPGA  interleave design for speed with a central
control FPGA.)

My (terrestrial/aircraft flyable) baseline hardware using lattice ISPlsi parts was more flexible.
Dual ADC ( 8Bit) frontend, a 16 by 16 bit wide RAM based table adder/squarer ( table loadable. translation from input to output freely choosable.)
a 16 bit input to 48 bit wide accumulator. VME or Parport interface for access.

That was rather flexible.
up front the sequencing program, table data.

more involved changing the Firmware loaded into the lattice things.
other IO structure, trigger ( in, out) signals. ... )

I've used the same PCB for Chirptransform ( R/I HF input )
and Acousto optic spectronemter ( CCD control and readout )  front ends.


Uwe





Other related posts:

  1. Home
  2. arocket
  3. Archive
  4. 12-2019