MILESTONE 13 Short Final Presentation

Project DescriptionWe aimed to implement a general discrete-signal network that appears, in various forms, inside many digital signal processing (DSP) applications.[1] Specifically, the circuit is a comb filter followed by a second-order recursive network (referred to henceforth as a biquad).

Project Description (Huh?)What does that mean?Comb = selective additive delayBiquad = Feedback loop with multiply and adds.

Overall effect is to implement 22 distinct functions based on the input coefficients.

MarketingMotivation

Marketing System IntegrationHow Does Our Circuit Fit Into the Bigger Picture?Focus on Audio/Video ApplicationsAudio:Digital Radios / MP3 Players (i.e. Motorola, Lucent, Texas Instruments)Digital Music Synthesis / Sampling (i.e. Yamaha, Korg)Noise Reduction (i.e. Dolby) Video:Comb Filter to separate color and brightness (i.e. Sony, Toshiba)Others:Motor Control Functions such as RPM (i.e. Ford, GE)

Design ProcessHow did you get from description to actual implementation?

Behavioral/AlgorithmicDescriptionHow exactly does it work?

Dataflow Example of function 1 of 22: The Moving Averager

Our circuit implements a simple moving average over 8 or 16 data points.

An average is simply the sum of a data set divided by the number of data points. The moving average takes a set number of data points to be used and as new data comes in, old data "falls off" the end of the calculation.

For example

Dataflow A Moving Averager Smoothes a Signal to Reduce Noise

DataflowA moving average over 8 data points:

4 1 6 3 9 5 0 6 7 2 1 801.01.1251.3752.253.03.03.6254.754.1254.754.6254.25

Emulations C Code

Emulations - Soft-IPTop Level VerilogVerified Complex Function

Floorplan Evolution

Road to Verification fp_mult verilog vs. schematicVSIM 1> run # x xxxxxx xxxxx * x xxxxxx xxxxx = x xxxxxx xxxxx # 0 000000 00000 * 0 000000 00000 = 0 000000 00000 # 0 011110 00000 * 1 011101 11000 = 1 011100 11000 # 0 100001 00100 * 0 100000 01000 = 0 100010 01101 # 0 100001 01110 * 0 100000 00001 = 0 100010 01111 # 0 100001 11100 * 0 100000 11110 = 0 100011 11010 # 0 100100 11110 * 0 100010 11000 = 0 101000 10110 # 1 100100 11110 * 1 100010 11000 = 0 101000 10110 # 0 100001 00010 * 0 100001 11110 = 0 100100 00000 # ** Note: $finish : fp_mult_tb0.v(41) # Time: 9 ns Iteration: 0 Instance: /tester

Road to Verification fp_add verilog vs. schematicVSIM 1> # x xxxxxx xxxxx + x xxxxxx xxxxx = x xxxxxx xxxxx # 0 000000 00000 + 0 000000 00000 = 0 000000 00000 # 0 011110 00000 + 1 011101 11000 = 0 011011 00000 # 0 100001 00100 + 0 100000 01000 = 0 100001 11000 # 0 100001 01110 + 0 100000 00001 = 0 100001 11110 # 0 100001 11100 + 0 100000 11110 = 0 100010 01101 # 0 100100 11110 + 0 100010 11000 = 0 100101 00110 # 1 100100 11110 + 1 100010 11000 = 1 100101 00110 # 0 100001 00010 + 0 100001 11110 = 0 100010 10000 # ** Note: $finish : fp_add_tb0.v(40) # Time: 9 ns Iteration: 0 Instance: /tester

Road to Verification Top Level StructuralVerified all of the functions for the Swiss Army Knife in Schematic.Plotted outputs using custom made code & MatLab.From plots it is evident that the accuracy is excellent.

Issues Encountered

Issues EncounteredMisunderstanding of DSP terms and main blocks represented in IEEE paper.

Booth encoding was time consuming and problematic.

Imaginary numbers proved less of a difficulty than we initially thought.

Issues correctly identifying the source of errors in analog simulation.

SpecsPin SpecsInputs (76 pins)X[n] : 12 pinsa1, a2, b0, b1, b2: 5 * 12 = 60 pinsvdd, gnd, N, c1 : 4 * 1 = 4 pinsOutputs (12 pins)Y[n] : 12 pinsTOTAL: 88 pins

SpecsPart SpecsFp_add:Transistors: 2,274 Area: 103.5450m x 124.200m = 12,860.29m2Density: 0.18Fp_mult:Transistors: 2,464Area: 95.5450m x 141.750m = 13,543.50m2Density: 0.18Comb:Transistors: 6,290Area: 99.360m x 151.290m = 15,032.17m2Density: 0.42

SpecsChip SpecsTransistors:34,564Area: 434.520m x 395.460m = 171,835.28m2Density0.20

LayoutLayer MasksFull chip layout

Layout - Overlay

ConclusionsJakeLayout?NickLayout / Sims?DarrenVerilog / Matlab / C / DSP?CraigVerilog / schematic / layout?