ISUAL Associated Electronics Package C. Ingraham

Associated Electronics Package (AEP) Mechanical Layout Thermal Control Power System Data Processing Unit Mass Memory Imager Interface Spectrophotometer Interface Array Photometer Interface Digital Signal Processor NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Mechanical Layout (1) Seven Subassemblies Subass’y = PCB plus Aluminum Frame PCB Frame = Slice of Enclosure Top and Bottom Covers Bottom Subass’y has Mounting Ears Ten Skewer Rods Secure Stack NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Mechanical Layout (2) NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Mechanical Layout (3) I/O Connectors in Frame at Board Edge Stacking Connectors for Inter-Board Connections No Motherboard Needed Simple Mechanical Arrangement Fewer Connections Short Signal Paths Good Radiation and EMI Shielding Good Thermal Path Easy Assembly/Disassembly Allows Incremental Development NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Thermal Control Heat Transfer by Conduction Component Leads to PCB PCB to Frame Frame to Deck Hottest Subassembly at Deck Hottest Components at board edge near Frame At Least One Thermistor per Subass’y Each Thermistor at Hottest Component NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Power System (1) DC-to-DC Converters Power Circuit Switching Current Limiting Monitoring NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Power System (2) Low Voltage Power Supply (1) Input Filter d.c.-to-d.c. Converters Modular Devices 2680R Family Dual Redundant +/-12 volt Converter Dual Redundant +5 volt Converter Independent Inputs Shunt-Wired Outputs Ground Isolation Input Range Exceeds S/C Spec Output Filter NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Power System (3) Low Voltage Power Supply (2) Input Current Monitors Relay-Switched 28-V to Array Photometer Nominal or Redundant Power to Array Photometer Low-Z Thermal Path to Deck Two Temperature Monitors Contained in Shielded Cavity Proven In IMAGE FUV Instrument NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Power System (4) Power Controller Receives d.c. Power from LVPS Individually Switched Power Services Flexible Power Control Able to Isolate Abnormal Loads Voltage and Current Monitors Valuable Diagnostic Information Approx. 106 Analog Housekeeping Channels Fold-back Current Limiting Protects Load Protects Power System Two Thermal Monitors NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Data Processing Unit (DPU) (1) DPU Functions Receives Commands Sends Status Sends Telemetry Manages Mass Memory Manages Power System Controls Instrument NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Data Processing Unit (DPU) (2) DPU Organization 8085 CPU Rad Hard, Simple, Byte wide, Low Power Proven in Space Missions 16 Kilobytes PROM Baseline Flight Software Power Switched (High Power) 128 Kilobytes SRAM Flight Software Execution Settings, Stack, Tables Telemetry DMA Source NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Data Processing Unit (DPU) (3) DPU Block Diagram Spacecraft Interface (RS-422) DPU Board 8085 CPU Science Telemetry Sci Telem To Imager MCP, Imager Phosphor, SP & AP HVPS 4 PR HV Control (FPGA) Engr. Telemetry Engr. Telem 1 PR Daylight Sensor Command Rx Commands Diag. Port (EGSE) 1 PR To Imager To SP To AP Time Rx Timing CDI Sender 1 PR To Imager To SP 16 KB PROM STIM To DSP DSP Handshake 128 KB RAM To LVPS and Power Controller Power Control Logic 128 KB EEPROM To Mass Memory Mass Memory I/f NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Data Processing Unit (DPU) (4) DPU Organization (Continued) 128 Kilobytes EEPROM Operating Parameter Tables Static Settings Alternate Flight Software Versions Command Receiver Status Telemetry Transmitter Science Telemetry Transmitter Command & Data Interface NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Data Processing Unit (DPU) (5) DPU Organization (Continued) I/O for Instrument Control High Voltage Control Bank Switching and Memory Map Watchdog Reset Timer Diagnostic Test Port NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Data Processing Unit (DPU) (6) Command & Data Interface Three-Wire Serial Interface (Data, Clock, Strobe) Eight-Bit Address Plus 16-Bit Data 2 Mb/s; about 14 microseconds per command NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Mass Memory (MM) (1) One Gigabit Multi-Port Static RAM 128 Mbytes Accessible by 8- or 32-Bit Words Stores Raw and Compressed Science Data Multi-Port DSP DPU Array Photometer Spectrophotometer Imager NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

Mass Memory Block Diagram AEP Mass Memory (MM) (2) Mass Memory Block Diagram NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

Error Detection and Correction AEP Mass Memory (MM) (3) Low Power Error Detection and Correction Automatic 1-bit Error Correction 2-bit Error Detection Error Counters Latchup Detection Power Isolation? Controlled by DPU NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Mass Memory (MM) (4) Buffer Allocation Controlled by DPU Circular or Linear Continuous Fill Freeze on Event Anywhere in MM Several Binary Sizes NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Mass Memory (MM) (5) DSP MM Interface DPU MM Interface Fast, Memory Mapped, Direct Access, Read/Write High Priority DPU MM Interface Slower, Memory Mapped, Direct Access, Read/Write Low Priority Bank Switched into 8085 Memory Space Telemetry by PCVF Blocks NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Mass Memory (MM) (6) Imager MM Interface Fast, Sequential DMA Write Only Circular or Linear Buffer NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

Spectrophotometer MM Interface AEP Mass Memory (MM) (7) Spectrophotometer MM Interface Fast, Sequential DMA Write Only Circular Buffer Array Photometer MM Interface NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

Start Signal from DPU or Trigger Fast Transfer to Mass Memory AEP Imager Interface Controlled by DPU CDI Imager Status Start Signal from DPU or Trigger Fast Transfer to Mass Memory Buffers in Mass Memory NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Spectrophotometer Interface (1) Six Channels Integrates Charge from PMT 12-bit A/D Converter per Channel Sampled at 10 kHz per Channel Continuously Fed to MM Circular Buffer Digital Processing of Selected Channel for Sprite Trigger Adjustable Trigger Threshold NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Spectrophotometer Interface (2) Spectrophotometer Interface Block Diagram NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Array Photometer Interface +28 Volts from Power Controller DMA Channel to Mass Memory Circular Buffer in Mass Memory Interface Characteristics TBD NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000

AEP Digital Signal Processor (DSP) Fast, Direct Access to Mass Memory Command Block Interface with DPU Details per NCKU NCKU UCB Tohoku Assoc Elect Package C. Ingraham SDR 7 Jun 2000