RF Triangulator: Indoor/Outdoor Location Finding 18-525 Architecture Proposal Giovanni Fonseca David Fu Amir Ghiti Stephen Roos Design Manager: Myron Kwai

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RF Triangulator Indoor/Outdoor Location
Finding 18-525 Architecture Proposal Giovanni
FonsecaDavid FuAmir GhitiStephen RoosDesign
Manager Myron Kwai

• Overall Project Objective
• Design a Radio-Frequency indoor/outdoor
  navigation system, utilizing the existing
  wireless infrastructure.
• Design Stage Objective
• Major Layout Blocks, Better Floorplans

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Status

• Structural Verilog complete.
• Schematics complete except for calc FSM
  (debugging).
• Layout of basic components complete.
• Major Layouts
• Mirror Adder Done
• Multiplier 90 done
• SRAM Done (testing)
• Divider 80 done
• FPU Prenorm Postnorm 60 done

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Transistor counts

• BETTER!!! Total 28,388 transistors
• Top Three 6,500 trans.
• 3 x FPU Add/Sub Unit 1500 trans.
• Control Registers Muxes 2000 trans.
• Calc 17,950 trans.
• 2 x FPU Add/Sub Unit 1500 trans.
• 1 x FPU Mult/Div Unit 5000 trans.
• 1 x Logshifter 200 trans.
• 1 x Comparator 800 transistors.
• FSM Logic 850 transistors
• 25 x 12-bit M-S En Reg 6600 trans. total
• 8-1,6-1,4-1,2-1 Mux Sets 3000 trans. total
• Lookup 3,938 trans.
• Control Registers Muxes 2000 trans.
• Control Logic 163 trans.
• SRAM 6k trans
• count not including SRAM, with SRAM 36k

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Top Three Module Floorplan
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New Mult/Div Layout
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New Mult/Div Explanation

• Old Div used simple shift subtract algorithm
  which is applied iteratively, one cycle per bit
• New Div will use the multiplier to produce
  rolled-out subtractions and shifts. This not
  only makes the design smaller, but also takes
  care of clocking issues ?

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SRAM Cell Layout
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SRAM in Layout
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SRAM Floorplan
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New Mirror Adder Layout
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Questions/Concerns

• Muxing and Routing is our biggest problem, but
  hopefully, the new design of Div/Mult will help
• Our transistor count is still too high
• How should we layout 8to1 muxes?
• Should we move averaging to the output of the
  calc module?
• Overall floorplan needs to be reconsidered