MEX Observations Temporarily Suspended, Solid-state memory problems |
MEX Observations Temporarily Suspended, Solid-state memory problems |
Nov 2 2011, 01:20 AM
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#1
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Senior Member Group: Members Posts: 1419 Joined: 26-July 08 Member No.: 4270 |
MEX Observations Temporarily Suspended
http://www.spaceref.com/news/viewsr.rss.html?pid=38935 -------------------- -- Hungry4info (Sirius_Alpha)
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Feb 15 2012, 09:39 AM
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#2
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Member Group: Members Posts: 247 Joined: 17-February 07 From: ESAC, cerca Madrid, Spain. Member No.: 1743 |
MEX back to full science operations now. After a lot of work.
http://sci.esa.int/science-e/www/object/in...fobjectid=50026 -------------------- --
cndwrld@yahoo.com |
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Feb 17 2012, 03:55 AM
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#3
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Senior Member Group: Members Posts: 1582 Joined: 14-October 05 From: Vermont Member No.: 530 |
This is a great writeup, btw. Came here to link to it! I'm still curious what causes the SSMM errors, though. A comment here: http://www.spaceflightnow.com/news/n1202/15marsexpress/ ... suggests that the memory system is having bit errors. Though in the way ESA describes it-- "errors during the transfer of data from the MTL(in the SSMM) to the command cache"-- I wonder if the errors occur not in the memory, but somewhere in a bus between the SSMM and the command cache in the CPU. They also suggest the redundant memory controller didn't do any better. Page 127 here has a memory system diagram for VEX, pretty much like MEX: http://dedead.free.fr/projet/01-%20VEX.T.A...CN.00349-02.pdf That doesn't really help show which bus could be the culprit, though, because they're basically all redundant. I suppose it could be multi-bit-errors in the flash percolating all the way through either memory controller. Except the system should catch those. So I can talk in circles and not know what's really going wrong here. And I'm curious. Anyone know of any other sources? |
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