DINO Peer Review 29 October 2015 Command and Data Handling Li, Michael Jayaraman, Vijay Bhatia, Vishal Winkelman, Martin

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium2 Introduction Command and Data Handling subsystem is responsible for computing and control of subsystem functions. The core of this subsystem is a single-board computer powered by the Intel PXA255 Processor.

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium3 Design Requirements C&DH must not exceed 7 Watts. Maximum ½ kg. External watchdog timer. External reset. 3.8” x 3.6” x 4” minimum profile Must run Linux 32MB RAM minimum 8MB FLASH minimum

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium4 Interfaces SubsystemRequirements COMM 1 dedicated RS-232 serial port to TNC. 1 RS-232 serial port to initialize radios. ScienceTwo USB ports for cameras. ADCS9 channel ADC (12-bit precision minimum) Tip-Mass1 RS-232 serial port for RF module. Structures 13 binary inputs to monitor states of certain deployment mechanisms Power1 R-232 serial port Thermal32 channel ADC for thermistors SoftwareKernel, BSP etc…

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium5 Arcom Viper PXA Mhz CPU SDRAM: 64M FLASH: 16M 256K Battery Backed SRAM Real-Time Clock Watchdog Timer Interfaces: –2 USB v1.1 –5 Serial Ports –Compact Flash Drive Support –Ethernet: 10/100BaseT –JTAG –8 GPIO –PC/104

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium6 Power Consumption Part Power Consumption (Watts) Flight Computer1.6 Wireless Interface2.4 Miscellaneous Interfaces1(max) Total5 (max)

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium7 Specifications (Viper overview) Power Requirements: + 5V only supply (typical) +5V (standby mode) Operating Temperature: -20°C to +70°C -40°C to +85°C (extended) Form Factor: PC104

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium8 Design Options MIP405 RPXLITE VIPER

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium9 OPTIONS CONSIDERED Option 1 : MIP405 Integrated embedded IBM PowerPC processor 375 DMIPS at 266MHz or PPC405GPr with 608 DMIPS at 400MHz Power consumption Typically < 5.0 Watts Ethernet, USB and 128MB SDRAM Pros 128MB on-board soldered SDRAM (ECC support), up to 4MB on-board soldered Flash. SRAM, EPROM, Flash and Disk-On-Chip modules can be added for keeping a redundant copy of the Flight Operating System as a back up in case of failure. Cons Higher power consumption. Doesn’t come with pre-loaded version of RedBoot Linux !!

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium10 OPTIONS CONSIDERED Option 2 : RPX Lite Integrated single-board computer based on the Motorola MPC823 version. Capable of providing the user with a bandwidth of up to 80MHz. Mechanical specifications of the PC104 standard 32, or 64 Mbytes SDRAM16 2, 4, 8, or 16 Mbytes Flash 0, 32, 128, 512 Kbytes NVRAM/RTC SCC2 - 10BaseT (RJ-45) Ethernet port Pros The Dino team could get some help from the 3CS team as this has been previously used in the 3CS project. Cons Processor speed – 80MHz. Much less compared to the Viper. Cost Per Unit ~$900. Much more expensive compared to other SBCs. Poor technical support.

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium11 Reasons For Design Decision Ultra Low power consumption of 1.6Watts. Has most number of Serial ports as compared to the other boards. Provides 8 General Purpose I/O pins with expansion possibilities. Meets all interface and design requirements. Good processing speed of 400MHz. Low Cost – Only $400!! Lead Time of around 1-2 Weeks. As the board is pretty new, it would be easily available in the market until Dec Dr. Sam Siewert and his team of researchers from the ECE department (CU) are using the same Viper board in their research. He would be a great source of information regarding Viper incase the C&DH team needs his advice

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium12 Other Unexplored Options EBC-C3 Winsystems SBC up to 700MHz via Eden processor. SAT-520PLUS Winsystems SBC featuring 133MHz processor.

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium13 Testing Plans UART TEST – TX/RX verified on a terminal Ethernet controller test – try pinging an IP address on the same network and say one IP outside the network (proposed to be used when we run short of the serial ports esp. for debugging and loading code on to the board…) RAM test – try writing all 0s and all 1s and read them back. Try writing alternate 1s and 0s and try reading back and verifying the data Flash test – similar to the RAM test. Test with the actual viper board. test with a potentiometer which varies the voltage to the A/D converter. JTAG Interface can be used to troubleshoot system hangs

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium14 Testing Plans (cont.) Test individual I/O pins. Test USB – Probe bus and detect cameras Test FPGA - Assert certain pins, test schematic. Radiation Tolerance tests (industry supported?)

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium15 Budget ComponentQuantity Unit Price Total Price Flight Computer2$410.00$ Interface Board However many fits on a sheet~$ Board Support Software1$ A/D board1~$ Total: ~$

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium16 System Block Diagram

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium17 Thermal Interface Sensors in different parts of DINO Temp. Sensor Flight Computer ADC Sensor select for temperature reading MUXMUX Digital Temp. readings select Temp. Sensor +5V 10k

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium18 Temperature Sensors Temperature-controlled Variable Resistor Voltage proportional to temperature change

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium19 Watchdog and Reset Decoder Built-in watchdog on Viper Reset decoder will be implemented in FPGA

DINO Peer Review 29 October 2015 Colorado Space Grant Consortium20 Issues and Concerns Radiation Shielding (How much, what kind…) BSP Software Licensing Testing Platform (Development Kit?)