March 2008 ALQ155 AAG Clinic ALQ155 AAG Conversion Clinic Team Members David Gedge Nate Decker William Sackett Spencer LittleAdvisors Dr. Priyank Kalla Thomas Dixon Special Thanks to Craig Gordon, Tim Price, and Ryan Yoshida

March 2008 ALQ155 AAG Clinic 2008 Recap on the HAFB Clinic Military aircraft use Line Replaceable Units (LRU’s)

March 2008 ALQ155 AAG Clinic 2008 CAPRE The airforce uses a program on a laptop called CAPRE to communicate with and configure LRU’s on planes.

March 2008 ALQ155 AAG Clinic 2008 The Big Picture To adapt to newer technologies, older tools are being upgraded. PAM PIM LRU

March 2008 ALQ155 AAG Clinic 2008 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

March 2008 ALQ155 AAG Clinic 2008 How does that affect us? To address these changes, we altered: USB Firmware USB Firmware CAPRE Software CAPRE Software FPGA Bitmap FPGA Bitmap

March 2008 ALQ155 AAG Clinic 2008 FPGA The PIM is talks to several different LRU’s To facilitate this, the core is an FPGA -Xilinx Spartan3 The FPGA executes a bitmap generated through VHDL by Xilinx ISE

March 2008 ALQ155 AAG Clinic 2008 Creating the Bitmap Pre-existing VHDL code was available from past clinics Pre-existing VHDL code was available from past clinics FPGA pinout for the Spartan3 had changed FPGA pinout for the Spartan3 had changed A new user constraint file (UCF) was needed 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 Using the schematics from both the older and newer PIM designs the older UCF was translated into the new file

March 2008 ALQ155 AAG Clinic 2008 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

March 2008 ALQ155 AAG Clinic 2008 Disable unused peripherals We do not need to use RAM RS Each device is disabled with a control signal.

March 2008 ALQ155 AAG Clinic 2008 New VHDL Signals

March 2008 ALQ155 AAG Clinic 2008 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

March 2008 ALQ155 AAG Clinic 2008 Capacitor Banks

March 2008 ALQ155 AAG Clinic 2008 VHDL Power-up Delays A counter is used to delay each enable signal leading to each bank of capacitors Pswitch: , , ,

March 2008 ALQ155 AAG Clinic 2008 The Result Error message: LRU is not responding

March 2008 ALQ155 AAG Clinic 2008 Feedback Questions or Comments?