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ALQ155 AAG Conversion Clinic
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Title: ALQ155 AAG Conversion Clinic
1
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
2
Recap on the HAFB Clinic
- Military aircraft use Line Replaceable Units
(LRUs)
3
CAPRE
- The airforce uses a program on a laptop called
CAPRE to communicate with and configure LRUs on
planes.
4
The Big Picture
- To adapt to newer technologies, older tools are
being upgraded.
LRU
5
Programmable 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
6
How does that affect us?
- To address these changes, we altered
- USB Firmware
- CAPRE Software
- FPGA Bitmap
7
FPGA
- The PIM is talks to several different LRUs
- To facilitate this, the core is an FPGA
- -Xilinx Spartan3
- The FPGA executes a bitmap generated through VHDL
by Xilinx ISE
8
Creating the Bitmap
- Pre-existing VHDL code was available from past
clinics - FPGA pinout for the Spartan3 had changed
- A new user constraint file (UCF) was needed
- Using the schematics from both the older and
newer PIM designs the older UCF was translated
into the new file
9
An 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
10
Disable unused peripherals
- We do not need to use
- RAM
- RS232
- 1553
- Each device is disabled with a control signal.
11
New VHDL Signals
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Problem Power Failure
- Problem
- After loading the FPGA, the USB chip would
sometimes lose its data - Cause
- A bank of capacitors was drawing power
- Solution
- Introduce delays into the power-up sequence
13
Capacitor Banks
14
VHDL Power-up Delays
- A counter is used to delay each enable signal
leading to each bank of capacitors - Pswitch 11110111,11100111,11000111,10000111
15
The Result
- Error message LRU is not responding
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Feedback
- Questions or Comments?
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