Sprinkler Buddy Presentation #9: “Layout and a New Feature” 4/4/2007 Team M3 Panchalam Ramanujan Sasidhar Uppuluri Devesh Nema Kalyan Kommineni Kartik Murthy Design Manager: Bowei Gai “Low Cost Irrigation Management For Everyone ! ”

Current Status Determine Project Develop Project Specifications Plan Architectural Design Determination of all components in design Detailed logical flowchart Design a Floor Plan Create Structural Verilog Make Transistor Level Schematic Layout (~85% done..all modules LVS, Some Global Routed, FSMs are incomplete) Testing (Extraction, LVS, and Analog Sim.) Glitches removed from all logic

Updated Design Size Block (# used)Size (um) 40:20 Muxes (4)20 x 80 60:20 Muxes (2)20 x 120 Counter (2)12 x 17 KC ROM (4 parts)181 x 8 P ROM (1)70 x 8 Metric Storage SRAMS (2) 181 x 60 Constant Storage ROM (1) 181 x 8 Floating Point Adder (4) 96x151 Floating Point Multiplier (2) 89 x Bit Registers (8)50 x um x 361 um ~ 1 : aspect ratio.129 mm^2 area.232 Density

Layout: Progress All Big Modules LVS Separate Operation Modes wired Hourly Update, Computation Mode, and Feed Back are done Daily Update is wired with the exception of the feedback loop 3/6 FSMs are not complete Sizes estimated Space left

Layout : Entire Chip

Power Logic

Gating Sections Chip separated into 7 virtual VDD/GND sections 1 in HU, 3 in DU, 3 in CM Distributes load and reduces power rail bounce

Power Rail Bounce “Understanding and Minimizing Ground Bounce During Mode Transition of Power Gating Structures”, Kim et al

Hourly Update Operation

Daily Update Operation

Computation Operation

Approximate Savings Components that remain on Feedback Mode (3407T) Registers (1944T) FSMs (1514T) SRAMs (4304T) 63.1% of all Transistors are shut off most of the day

Layout : Power Gate Transistors Density:.05 transistors/um 2 V DD Gating

Layout : Power Gate Transistors Density:.06 transistors/um 2 GND Gating

Design Challenges and Implementation Decisions For The Past Week Design Challenge Translation to HW Low Power Power Gating to reduce leakage current Sacrificed Density for Power Savings

Problems/Questions FSM routing was much more complex than expected

For Next Time Finish