CASSINI In Space

 

Helix Nebula Banner Image
CASSINI

Cassini MIMI Investigation at Fundamental Technologies

 

 Historical MIMI Memos and Notes

 

Data Processing Unit

 

J. Dandouras, MIMI team meeting, October 1994

 

Memory Map of EPU

 

(Click on figure for larger version.)

 

 

Memory Map of CPU

 

(Click on figure for larger version.)

 

 

EPU Interrupts

 

Normal Mode of Operation

 

NMI CPU Watchdog timer time-expired
E11   
E12 Commun. Port (CPU to EPU Command or Data available)
E13 Test Port Interrupt (Bus B)
E14 CHEMS data available
E15 INCA data available

 

Backup Mode of Operation

 

NMI  
E11 BIU Interrupts *
E12 Housekeeping data available and LEMMS interrupts **
E13 Test Port Interrupt (Bus B)
E14 CHEMS data available
E15 INCA data available

 

* BIU Interrupts: RTI, DTSTART, BIU_STDINTn, BIU_BCRTF, WD_XPIRD, WP_VILTN
** LEMMS Interrupts: Sensor data available, STP_CKL_ECHO, ABS_POS

 

CPU Interrupts

 

Normal Mode of Operation

 

NMI EPU Watchdog timer time-expired
E11 BIU Interrupts *
E12 Commun. Port (EPU to CPU Command or Data available)
E13 Test Port Interrupt (Bus A)
E14 Housekeeping data available and LEMMS interrupts **
E15  

 

Backup Mode of Operation

 

NMI  
E11 BIU Interrupts *
E12 Housekeeping data available and LEMMS interrupts **
E13 Test Port Interrupt (Bus A)
E14 CHEMS data available
E15 INCA data available

 

* BIU Interrupts: RTI, DTSTART, BIU_STDINTn, BIU_BCRTF, WD_XPIRD, WP_VILTN
** LEMMS Interrupts: Sensor data available, STP_CKL_ECHO, ABS_POS

 

 

Return to DPU main table of contents page.

Return to Historical MIMI Notes and Memos main page.

Return to Cassini MIMI table of contents page.
Return to Fundamental Technologies Home Page.



Updated 8/8/19, Cameron Crane

QUICK FACTS

Manufacturer: The Cassini spacecraft was manufactured by NASA's Jet Propulsion Laboratory, and the Huygens Probe was manufactured by Thales Alenia Space.

Mission Duration: The Cassini-Huygens mission launched on October 15 1997, and ended on September 15 2017.

Destination: Cassini's destination was Saturn and its moons. The destination of the Huygens Probe's was Saturn's moon Titan.

Orbit: Cassini orbited Saturn for 13 years before diving between its rings and colliding with the planet on September 15th, 2017.