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Virtual Wallet

Virtual Wallet. A handheld device that saves time and money through smart budget management and simplifies shopping experience. Gates Winkler Yin Shen Jordan Fei Project Manager: Prajna Shetty 18-525 12/02/2009. Outline. Product Proposal Market Appeal System Description Schematics

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Virtual Wallet

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  1. Virtual Wallet A handheld device that saves time and money through smart budget management and simplifies shopping experience Gates Winkler Yin Shen Jordan Fei Project Manager: Prajna Shetty 18-525 12/02/2009

  2. Outline • Product Proposal • Market Appeal • System Description • Schematics • Simulation Results • Layout Evolution • Retrospection Slide 2 Virtual Wallet December 2, 2009

  3. Product Description • Handheld system that customers pick up upon entering store. • Virtual Wallet retrieves information stored on customer’s SecurOne card. • Allows user to set a budget and monitor his/her shopping • Notifies user if they go over budget. • Accesses database and applies existing membership discounts • Allows online bill payment and self-checkout • Virtual Wallet has functionality to remove items and increase budget if user goes over. Item 1 Item 2 checkout Slide 3 Virtual Wallet December 2, 2009

  4. Design Objectives • Minimize cost by optimizing area. • Utilize extremely regular layout • Robust verification at all design levels • Behavioral Verilog • Structural Verilog • Schematics Slide 4 Virtual Wallet December 2, 2009

  5. Connection to SecurOne • SecurOne system is an identification card and reader system. • Card contains access to user’s personal information, such as bank accounts. • Other 18-525 group designed secure reader system. • Reader will be a component of the Virtual Wallet so that the device can get personal information of the user for checkout. Slide 5 Virtual Wallet December 2, 2009

  6. Market Appeal • The SecurOne card will be used in every shopping center. • This device can be implemented in any store, as it connects to a store’s unique database. • Saves shopping time and eliminates checkout lines. Slide 6 Virtual Wallet December 2, 2009

  7. System Description Slide 7 Virtual Wallet December 2, 2009

  8. System Specification • 30-bit Integer arithmetic units cumulatively calculates amount spent • Budget and price calculations are done in cents, with the display placing an appropriate decimal. • The RFID obtained by Virtual Wallet is fed to the online database to obtain information about a product and its price Slide 8 December 2, 2009 Virtual Wallet

  9. Select bank account and input budget Begin shopping Price of items bought is added to total Scan card and confirm identity If total goes over budget Apply coupons if possible Remove items to go back under budget Increase budget if possible Flow Diagram Slide 9 Virtual Wallet December 2, 2009

  10. Functional Design SRAM: Memory to store 32 8-bit item RFID tag. Other information looked up from Online store database. Second SRAM stores budget. Adder: Adding block. 30-bit addition Subtractor: Subtracting block. Will handle discounts and item removals. As items are removed the SRAM remembers the items removed so they will not be added into total costs Registers: Budget and Total registers store values Comparator: Takes in the budget entered by the user and total after each item is scanned checks to see if one is over the budget Touchscreen: User Input (not implemented) Display: (not implemented) Interface to Online Database: Data lines Slide 10 Virtual Wallet December 2, 2009

  11. Functional Design keypad Checks RFID tag against store database to get price etc. Interfacing logic for Database and Display Input FSM Store Database Budget register Item SRAM Make notes in subtractor RFID total register Budget FSM Display Adder Subtractor Comparator battery Battery FSM Discount FSM SecurOne Database SecurOne card USER ID SecureOne Slide 11 Virtual Wallet December 2, 2009

  12. Initial Select Account Not enough in account Display error Connect to SecureOne Don’t input budget Set budget to max in account Input Budget Check account Start Shopping Enough in account Budget stored in memory Input FSM Slide 12 Virtual Wallet December 2, 2009

  13. Don’t go over Initial Check SecureOne Database. Pay Checkout Go over Check SRAM Make note in subtractor Total not over budget Remove item Over Added another item Remove item Make note in subtractor Total still over budget Remove item Budget FSM Slide 13 December 2, 2009 Virtual Wallet

  14. Initial Get nothing Scanned item No discount Check Database Make note in subtractor discount Check SRAM Discount FSM Slide 14 Virtual Wallet December 2, 2009

  15. Good Battery Battery Good When Plugged in Battery Starts Charging and returns to the correct State when unplugged Battery Low Battery Low Battery Charging Low Battery Battery FSM Slide 15 Virtual Wallet December 2, 2009

  16. Virtual Wallet Top Module Binary to BCD converter and controlling logic SRAM BCD to Binary converter and controlling logic FSMs Control logic Arithmetic and control logic Slide 16 Virtual Wallet December 2, 2009

  17. Verification Slide 17 Virtual Wallet December 2, 2009

  18. Verification Process • Designed blocks in Behavioral Verilog to test design. • After individual blocks simulated, top level control logic made to test all pieces together. • From Verilog design, built schematics for individual blocks. • Tested individual blocks to determine functionality. • After each block was confirmed worked, top level schematic tied pieces together with control logic. • Tested with multiple vectors to determine functionality. • 1 ns clock • Tested different functions, such as input budget, remove item, writing to SRAM, etc. Slide 18 Virtual Wallet December 2, 2009

  19. Budget Budget of $50 is input, converted to binary (110010), and stored in budget register shifted ten bits higher Slide 19 Virtual Wallet December 2, 2009

  20. SRAM Wrote 5 values into SRAM Values of bit and bit_bar are shown here as data is written. Slide 20 Virtual Wallet December 2, 2009

  21. SRAM Slide 21 Virtual Wallet December 2, 2009

  22. SRAM Slide 22 Virtual Wallet December 2, 2009

  23. Arithmetic Total goes over budget, over signal goes high Remove item to send total back under budget Addition: price of new items added to total Slide 23 Virtual Wallet December 2, 2009

  24. Layout Evolution Slide 24 Virtual Wallet December 2, 2009

  25. Initial Floorplan Slide 25 Virtual Wallet December 2, 2009

  26. Improved Floorplan Slide 26 Virtual Wallet December 2, 2009

  27. Final Layout FSMs control logic Arithmetic: adder subtractor total register SRAM Binary/BCD converters Comparator Slide 27 Virtual Wallet December 2, 2009

  28. Final LayoutTop Half Slide 28 Virtual Wallet December 2, 2009

  29. Final LayoutBottom Half Slide 29 Virtual Wallet December 2, 2009

  30. Design Specifications • Area ~ 56980μm2 • 370μm X 154μm • Aspect Ratio: 1:2.4 • Transistor count: 18532 • Density: 0.32527 transistors/μm2 Slide 30 Virtual Wallet December 2, 2009

  31. Retrospection • Overall the project was completed without too much difficulty or variance from the original plan. • The floorplan design changed significantly from the original version to the final layout. • Had to account for 30-bit routing • Some parts were deemed unnecessary • Issues with modelSIM made caused full structural verilog tests impossible • Logic which looped onto itself had to be replaced with behavioral verilog. • Some library naming issues came up due to having to share pieces between the three of us. Slide 31 Virtual Wallet December 2, 2009

  32. In Conclusion • Virtual Wallet provides a safe and secure way to increase shopping efficiency. • User is able to check out with Virtual Wallet when done shopping • Can be implemented in any store from large chains to mom and pop businesses. Slide 32 Virtual Wallet December 2, 2009

  33. Thank you • Questions/Comments? Slide 33 Virtual Wallet December 2, 2009

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