Proposal 11348 (STScI Edit Number: 1, Created: Friday, January 18, 2008 8:01:56 AM EST) - Overview
11348 - Science Data Buffer Check with Self-Test
Cycle: 17, Proposal Category: SM4/STIS
(Availability Mode: RESTRICTED)
INVESTIGATORS
Name
Dr. Alan D. Welty (PI)
Institution
Space Telescope Science Institute
E-Mail
welty@stsci.edu
VISITS
Visit Targets used in Visit
Configurations used in Visit
Orbits Used Last Orbit Planner Run
01
DARK
S/C
1
18-Jan-2008 08:01:50.0
OP Current
with Visit?
yes
02
DARK
S/C
1
18-Jan-2008 08:01:52.0
yes
13
DARK
S/C
1
18-Jan-2008 08:01:54.0
yes
3 Total Orbits Used
ABSTRACT
The STIS Science Buffer RAM is checked for bit flips during SAA passages. This is followed by a Control Section (CS) self-test consisting of
writing/reading a specified bit pattern from each memory location in Buffer RAM. The CS Buffer RAM self-test as well as the bit flip tests are all
done with the CS in Operate.
Supports Activity STIS-03
Proposal 11348 (STScI Edit Number: 1, Created: Friday, January 18, 2008 8:01:56 AM EST) - Overview
OBSERVING DESCRIPTION
Using the set buffer memory macro, write zeros into CS Buffer RAM prior to passage into the SAA and then dump buffer memory to SSR after exit
from the SAA to check for bit flips. This Buffer RAM check should be executed several times, spanning the SAA. Then use the CS self test macro to
conduct a pattern test of CS Buffer RAM and check the memory fail counter after the test has completed.
REAL TIME JUSTIFICATION
Realtime access to the engineering telemetry is needed to check the memory monitoring of the self test results in visit 13.
ADDITIONAL COMMENTS
Prerequisites: Successful execution of proposal 11347 and subsequent verification of the dumps from that program. This program is to be scheduled
24-36 hours after 11347.
Visits 01-02 should be scheduled as a pair, before and after a deep SAA passage.
A contingency Operations Request to suspend STIS must be in place. This can be the same one requested in proposal 11347: If it was used after
11347, this proposal will not execute as scheduled. If not, then it is still ready to be used after 11348 if necessary.
The next STIS proposal is to be scheduled 24-36 hours after this proposal is completed.
All exposures in this proposal require Special Commanding.
2
Proposal 11348, Visit 01, implementation
Diagnostic Status: No Diagnostics
Scientific Instruments: S/C
Special Requirements: GYRO MODE 3GOBAD
Comments: This exposure will set all of buffer RAM to zeros prior to a deep SAA passage, which will be followed by visit 02.
#
Label
Target
Config,Mode,Aperture
Spectral Els.
Opt. Params.
Special Reqs.
Groups
1
Set Buffer R DARK
S/C, DATA, NONE
SAA CONTOUR 05;
AM to 0
SPEC COM INSTR
EOSETCSRAM;
QASISTATES STIS
SI OPERATE OPER
ATE;
QASISTATES STIS
MA1 HOLD HOLD;
QASISTATES STIS
MA2 HOLD HOLD;
QASISTATES OMC
E SI HOLD HOLD
Comments: Prior to SAA entry (model 05), set every word of buffer RAM to 0.
Orbit Structure
Exposures
Visit
Proposal 11348 - Visit 01 - Science Data Buffer Check with Self-Test
3
Fri Jan 18 13:01:56 GMT 2008
Exp. Time/[Actual Dur.]
180.0 Secs
[==>]
Orbit
[1]
Proposal 11348, Visit 02, implementation
Diagnostic Status: No Diagnostics
Scientific Instruments: S/C
Special Requirements: GYRO MODE 3GOBAD; AFTER 01
Comments: This exposure will dump all of buffer RAM after a deep SAA passage before which visit 01 was executed.
#
Label
Target
Config,Mode,Aperture
Spectral Els.
Opt. Params.
1
Dump Buffe DARK
S/C, DATA, NONE
r RAM
Exposures
Visit
Proposal 11348 - Visit 02 - Science Data Buffer Check with Self-Test
Orbit Structure
Comments: After an SAA passage, dump buffer RAM using format 2.
4
Fri Jan 18 13:01:57 GMT 2008
Special Reqs.
Groups
SAA CONTOUR 05;
SPEC COM INSTR
EOCSFMT2DMP;
QASISTATES STIS
SI OBSERVE OBSE
RVE;
QASISTATES STIS
MA1 HOLD HOLD;
QASISTATES STIS
MA2 HOLD HOLD;
QASISTATES OMC
E SI HOLD HOLD
Exp. Time/[Actual Dur.]
300.0 Secs
[==>]
Orbit
[1]
Exposures
Visit
Proposal 11348 - Visit 13 - Science Data Buffer Check with Self-Test
Proposal 11348, Visit 13, implementation
Fri Jan 18 13:01:58 GMT 2008
Diagnostic Status: No Diagnostics
Scientific Instruments: S/C
Special Requirements: GYRO MODE 3GOBAD
Comments: CS Buffer Self Test.
If at the end of the CS buffer test, any of the Results Tables are non-zero entries, a status buffer message with the number of errors generated will be issued by the FSW. If this occurs, contact the GSFC Payload FSW
team for further analysis.
#
Label
Target
Config,Mode,Aperture
Spectral Els.
Opt. Params.
Special Reqs.
Groups
Exp. Time/[Actual Dur.]
Orbit
1
CS Self Test DARK
S/C, DATA, NONE
SAA CONTOUR 05;
1500.0 Secs
RT ANALYSIS;
[==>]
SPEC COM INSTR
EOCSSELFTST;
QASISTATES STIS
SI OPERATE OPER
ATE;
[1]
QASISTATES STIS
MA1 HOLD HOLD;
QASISTATES STIS
MA2 HOLD HOLD;
QASISTATES OMC
E SI HOLD HOLD
Comments: With the CS in Operate. perform a pattern read/write test of the CS Buffer RAM. Prior to the start of this test, set up memory monitors on the four bytes of the selftest error counter.
Orbit Structure
Realtime access to the engineering telemetry is needed to check the memory monitoring of the self test results.
5