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Aztec PC Oscilloscope

Aztec PC Oscilloscope. Michael Mason Jed Brown Josh Price Andrew Youngs. Changes in Design since PRD. Spartan 3 Starter kit replaces Spartan 3E Kit Reason: Cheaper and more readily available. Better alternative for low-income students. Not hard to tweak code for the 3E. Siemens 8051

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Aztec PC Oscilloscope

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  1. Aztec PC Oscilloscope Michael Mason Jed Brown Josh Price Andrew Youngs

  2. Changes in Design since PRD • Spartan 3 Starter kit replaces Spartan 3E Kit • Reason: Cheaper and more readily available. Better alternative for low-income students. Not hard to tweak code for the 3E. • Siemens 8051 • Reason: Already known by us, provides enough. • PC Communication Serial and USB • Initially PC->Scope communication will be via serial cable to the uC. • Scope Data -> PC will de via serial/USB interface from the FPGA.

  3. Block Diagram Scope Serial M C SD R A M S C PC A/D USBController Spartan-3 eeprom

  4. USB Controller • UM232R • UART Interface supports 7/8 bit data, 1/2 stop bits, and Odd/Even/Mark/Space/No Parity • Transfer Data Rate 300k to 1Mega Baud (RS232) • FIFO receive and transmit buffers for high data throughput. • Integrated 3.3V level converter for USB I/O.

  5. Spartan-3 FPGA Board • Xilinx Devices: • Spartan-3 (XC3S200) • Clocks: 50 MHz crystal clock oscillator • Memory • 256Kx16 ISSI - 10 ns SRAM devices

  6. Spartan-3 Starter Kit • Connectors and Interfaces • Xilinx Spartan-3 FPGA w/ twelve 18-bit multipliers, 216Kbits of block RAM, and up to 500MHz internal clock speeds • -200, -400, and -1000 versions available • On-board 2Mbit Platform Flash (XCF02S) • 8 slide switches, 4 pushbuttons, 9 LEDs, and 4-digit seven-segment display • Serial port, VGA port, and PS/2 mouse/keyboard port • Three 40-pin expansion connectors • Three high-current voltage regulators (3.3V, 2.5V, and 1.2V) • 1Mbyte on-board 10ns SRAM (256Kb x 32)

  7. Spartan-3 Schematic

  8. Expansion Slot Schematic

  9. Microcontroller • Siemens 8051 • 16-bit addressable, 8-bit data, 64kB accessible external RAM • Basic control unit for enables, external peripherals (SPI with ADC) • Will interface with the computer for sending data and receiving user commands (RS-232).

  10. Microcontroller

  11. Voltage Regulator

  12. Latch, Decoder, EPROM, and SRAM from uC(32kx8 EPROM for program memory) (32kx8 SRAM for external memory)

  13. EEPROM from uC(16kbit serial)

  14. Serial Port

  15. Serial Peripheral Interfacing (SPI) • SCK (Serial Data Clock): Data is shifted/latched on the rising or falling edge of SCK (see next section). • MOSI (Master Output/Slave Input): Data is transmitted out of this pin if the chip is a Master and into this pin if the chip is a Slave. • CS (Chip Select, active low): Tells the peripheral that a transfer is about to begin.

  16. Analog to Digital Conversion • Differential Input • ADC: 3V peak to peak maximum input • Voltage Reference

  17. Input Stage • Capacitive Impedance matching • 1:1, 10:1 Attenuation • AC Coupling

  18. Single-Ended to Differential Stage

  19. Feedback Control 4 Gain Levels: 2, 4, 6, 10

  20. Gain Stage #2 • CLC5526: Digitally Controlled Variable Gain Amplifier • +30 dB to –12dB

  21. ADS807 • Internal Reference Voltage • Input: 3Vpp (V+ - V- <3V) • Clock Input from FPGA: 10k to 53M samples/sec • 12-bit Output Buffered, sent to FPGA

  22. Software – FPGA • Labview Module using VESA interface. • Communication via virtual COM port drivers. • Cause the USB device to appear as an addition com port available to the PC. • Applications can access the USB device in the same way as it would access a standard COM port.

  23. Software – User GUI • Initial development in both MATLAB and Labview • Labview has better interface modules but more difficult to program the GUI. • MATLAB is easier to program the GUI but the advanced controls will be more difficult • Use Labview to develop GUI with MATLAB as a fallback.

  24. Graphical User Interface • Inputs • Data will be inputted via USB from the FPGA board. • Data Format • 8 bit data transfer • 1 stop bit • 0 parity bits • Data speeds will be 300k – 1M baud

  25. Graphical User Interface - cont. • Outputs • Serial output to Microcontroller • Data will be 8 bit with 1 stop bit. (RS232) • Graphical Output to Monitor • Data Graphs • Controls to manipulate data graph and perform analysis. • Control inputs to be sent to micro controller.

  26. Parts List

  27. Updated Schedule

  28. Timeline – Milestone 1 • Micro controller • Programming Complete • Serial Interface Working • A/D Converter • Circuit design complete • Prototype complete and tested • FPGA • Programming mostly complete • USB interface started • Software • GUI preliminary programming, simple I/O • PCB • Schematics completed for 1st revision.

  29. Timeline – Milestone 2 • FPGA • Programming complete • Trigger mode enabled • Software • GUI updated to include all necessary functionality. • PCB 2 • 2nd Revision submitted and received. • Make sure PCB is working • A/D • Filtering implemented as necessary

  30. Timeline – Expo • Scope Working • All parts integrated • PCB completely tested and connected to FPGA board. • Extras • GUI interface updated as time allows • Documentation Completed • USB interface working • Data transmitting from FPGA to PC • GUI • Sending signals to micro controller • Updated graphing capabilities • PCB • 2nd revision submitted and tested. • A/D connection to FPGA • Data being received and stored

  31. Division of Labor • Mike • Software – GUI Interface, FPGA Programming • USB Interface • Assist Josh with microcontroller and Drew with A/D • Jed • FPGA Programming • Software Interface • Assist with A/D converter • Drew • A/D converter • Microcontroller Interface • FPGA Interface • Josh • Microcontroller • Interface with A/D converter • Serial Interface with Computer

  32. Questions ? ? ?

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