Transcript Peer Review 7/29/03 - Colorado Space Grant Consortium

DINO Peer Review
7 April 2016
Command and
Data Handling
Li, Michael
Jayaraman, Vijay
Bhatia, Vishal
Winkelman, Martin
DINO Peer Review
7 April 2016
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.
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Design Requirements
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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
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Interfaces
Subsystem
Requirements
COMM
• 1 dedicated RS-232 serial port to TNC.
• 1 RS-232 serial port to initialize radios.
Science
Two USB ports for cameras.
ADCS
9 channel ADC (12-bit precision minimum)
Tip-Mass
1 RS-232 serial port for RF module.
Structures
13 binary inputs to monitor states of certain deployment
mechanisms
Power
1 R-232 serial port
Thermal
32 channel ADC for thermistors
Software
Kernel, BSP etc…
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Arcom Viper
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PXA255 400Mhz CPU
SDRAM: 64M
FLASH: 16M
256K Battery Backed SRAM
Real-Time Clock
Watchdog Timer
Interfaces:
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2 USB v1.1
5 Serial Ports
Compact Flash Drive Support
Ethernet: 10/100BaseT
JTAG
8 GPIO
PC/104
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Power Consumption
Part
Power Consumption
(Watts)
Flight Computer
1.6
Wireless Interface
2.4
Miscellaneous Interfaces
1(max)
Total
5 (max)
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Specifications (Viper overview)
Power Requirements:
• 1.6W @ + 5V only supply (typical)
• 200mW @ +5V (standby mode)
Operating Temperature:
• -20°C to +70°C
• -40°C to +85°C (extended)
Form Factor: PC104
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Design Options
• MIP405
• RPXLITE
• VIPER
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OPTIONS CONSIDERED
Option 1 : MIP405
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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 !!
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OPTIONS CONSIDERED
Option 2 : RPX Lite
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Integrated single-board computer based on the Motorola MPC823 version.
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Capable of providing the user with a bandwidth of up to 80MHz.
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Mechanical specifications of the PC104 standard
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32, or 64 Mbytes SDRAM16
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2, 4, 8, or 16 Mbytes Flash
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0, 32, 128, 512 Kbytes NVRAM/RTC
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SCC2 - 10BaseT (RJ-45) Ethernet port
Pros
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The Dino team could get some help from the 3CS team as this has been
previously used in the 3CS project.
Cons
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Processor speed – 80MHz. Much less compared to the Viper.
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Cost Per Unit ~$900. Much more expensive compared to other SBCs.
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Poor technical support.
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Reasons For Design Decision
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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 2005.
• 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
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Other Unexplored Options
• EBC-C3 Winsystems SBC up to 700MHz via
Eden processor.
• SAT-520PLUS Winsystems SBC featuring
133MHz processor.
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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
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Testing Plans (cont.)
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Test individual I/O pins.
Test USB – Probe bus and detect cameras
Test FPGA - Assert certain pins, test schematic.
Radiation Tolerance tests (industry supported?)
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Budget
Component
Quantity
Flight
Computer
2
Interface
Board
Unit
Price
Total
Price
$410.00
$820.00
However many
fits on a sheet
~$200.00
~$200.00
Board
Support
Software
1
$1000.00
$1000.00
A/D board
1
~$100.00
~$100.00
Total:
~$2000.00
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System Block Diagram
Flight Computer (Arcom Viper)
Intel 400 MHz PXA255 XScale
PC/104
PC/104 TTL Digital I/O
Current/Voltage
Monitors for Mechanism
Deployment
PC/104
USB (2)
Serial Ports
FPGA
(Reset Logic)
A/D Converters
ADCS
Sensors
Reset
Radio/TNC
(2 COM)
Interface
Board
Thermal
Sensors
(~32)
Science
(Cameras)
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Power
Subsystem
Tip Mass
RF Module
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Thermal Interface
Flight Computer
Sensor select for temperature
reading
Digital Temp. readings
select
ADC
10k
Temp.
Sensor
Sensors in
different
parts of
DINO
M
U
X
+5V
Temp.
Sensor
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Temperature Sensors
Voltage
proportional to
temperature
change
Temperature-controlled
Variable Resistor
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Watchdog and Reset Decoder
• Built-in watchdog on Viper
• Reset decoder will be implemented in FPGA
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Issues and Concerns
• Radiation Shielding (How much, what kind…)
• BSP Software Licensing
• Testing Platform (Development Kit?)
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