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ALQ155 AAG Conversion Clinic. Team Members David Gedge Nate Decker William Sackett Spencer Little Advisors Dr. Priyank Kalla Thomas Dixon Special Thanks to Craig Gordon, Tim Price, and Ryan Yoshida. ALQ155 AAG Clinic 2008. 1. Recap on the HAFB Clinic. - PowerPoint PPT Presentation
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ALQ155 AAG Clinic 2008 March 2008March 2008ALQ155 AAG Clinic 2008 1
ALQ155 AAG Conversion ClinicALQ155 AAG Conversion Clinic
Team MembersTeam Members• David Gedge• Nate Decker• William Sackett• Spencer Little
AdvisorsAdvisors• Dr. Priyank Kalla• Thomas Dixon
Special Thanks to Special Thanks to Craig Gordon, Tim Price, Craig Gordon, Tim Price,
and Ryan Yoshidaand Ryan Yoshida
ALQ155 AAG Clinic 2008 March 2008March 2008
Recap on the HAFB ClinicRecap on the HAFB Clinic
Military aircraft use Line Replaceable Units (LRU’s)
ALQ155 AAG Clinic 2008 March 2008March 2008
CAPRECAPRE
The airforce uses a program on a laptop called CAPRE to communicate with and configure LRU’s on planes.
ALQ155 AAG Clinic 2008 March 2008March 2008
The Big PictureThe Big Picture
To adapt to newer technologies, older tools are being upgraded.
PAMPIM LRULRU
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Programmable Interface ModuleProgrammable Interface Module
• The PIM 2.0 is our focus
• PIM hardware has changed from 1.1 to 2.0
• New FPGA• New USB chip• New peripherals
ALQ155 AAG Clinic 2008 March 2008March 2008
How does that affect us?How does that affect us?
To address these changes, we altered:To address these changes, we altered:• USB FirmwareUSB Firmware
• CAPRE SoftwareCAPRE Software
• FPGA BitmapFPGA Bitmap
ALQ155 AAG Clinic 2008 March 2008March 2008
FPGAFPGA
The PIM is talks to several different LRU’sThe PIM is talks to several different LRU’s
To facilitate this, the core is an FPGATo facilitate this, the core is an FPGA
-Xilinx Spartan3-Xilinx Spartan3
The FPGA executes a bitmap generated through The FPGA executes a bitmap generated through VHDL by Xilinx ISEVHDL by Xilinx ISE
ALQ155 AAG Clinic 2008 March 2008March 2008
Creating the BitmapCreating the Bitmap
• Pre-existing VHDL code was available from past Pre-existing VHDL code was available from past clinicsclinics
• FPGA pinout for the Spartan3 had changedFPGA pinout for the Spartan3 had changed
• A new user constraint file (UCF) was neededA new user constraint file (UCF) was needed
• Using the schematics from both the older and Using the schematics from both the older and newer PIM designs the older UCF was translated newer PIM designs the older UCF was translated into the new fileinto the new file
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An Extra StepAn Extra Step
• Default bitmaps created by the Xilinx bitgen are the wrong format for loading onto the FPGA
• We correct this using a Xilinx tool called PromGen
ALQ155 AAG Clinic 2008 March 2008March 2008
Disable unused peripheralsDisable unused peripherals
• We do not need to use• RAM• RS232• 1553• Each device is disabled with a control signal.
ALQ155 AAG Clinic 2008 March 2008March 2008
New VHDL SignalsNew VHDL Signals
ALQ155 AAG Clinic 2008 March 2008March 2008
Problem: Power FailureProblem: Power Failure
Problem:Problem:
After loading the FPGA, the USB chip would After loading the FPGA, the USB chip would sometimes lose its datasometimes lose its data
Cause:Cause:
A bank of capacitors was drawing powerA bank of capacitors was drawing power
Solution:Solution:
Introduce delays into the power-up sequenceIntroduce delays into the power-up sequence
ALQ155 AAG Clinic 2008 March 2008March 2008
Capacitor BanksCapacitor Banks
ALQ155 AAG Clinic 2008 March 2008March 2008
VHDL Power-up DelaysVHDL Power-up Delays
A counter is used to delay each enable signal leading to each bank of capacitors
Pswitch: 11110111,11100111,11000111,10000111
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The ResultThe Result
Error message: LRU is not respondingError message: LRU is not responding
ALQ155 AAG Clinic 2008 March 2008March 2008
FeedbackFeedback
Questions or Comments?Questions or Comments?
