Development of Hard Intellectual Property core for Convolution Encoder

Guide:Prof. Usha Mehta Prepared By:-

Archit (09bec101)Aalay (09bec025)

StepsSelection of IP-Core and its theory

and study of IP-coreVHDL and Verilog codingImplementing code on FPGA kitLayout MICROWIND software toolComparison and readings

Review 1Selection of IP-Core and its theory

and study of IP-coreVHDL and verilog code for state

machine apprach

About convolution codesError Correcting CodeSequential CodesConstraint length (k) (trade-off)Rate of Coder (r) (trade-off)Why so named ?Applications (wireless communication)Popular Codes (k=7; r=1/2)

ApplicationsWireless Standards : W-LAN, Wi-Max etc.Satellite communicationCellular Standards : GSM, CDMA, 3G etc.

Standard Polynomials

Example

Block Diagram View

State Machine View

Constraint length 7

Constraint length 7

Review 2Both VHDL and Verilog codes are ready with

block diagram approachConstraint Length 7; Rate ½Results showing comparison with Coregen(Core

Generation)Each component is made in microwindDimension of Each Component madeAlso a C code for convolution coder is made to

easy testing

Proposed CodeVHDLVerilogRTL view

Proposed code

Proposed Code

Proposed Code

Coregen

Coregen

Comparison with Coregen

Components requiredNo of components

No of Transistors

DFF 6 16

XOR2 4 4

XOR_regular 1 6

Layouts of each component

Layouts of DFF

Layouts of 2 input Xor

XOR_2

Complements Available

Layouts of 2 input Xor

XOR Regular

Complements Not Available

Design schematic

Comparison with Verilog Compilation

Using Verilog coding 63 NMOS 51 PMOS 114 Total Buffers not provided Metalization 3 levels Area = 575.28 µm Highly rectangular

Proposed Hard IP 60 NMOS 60 PMOS 120 total Bufferes provided Metalization 2 layers Area 186.3 square µm Almost square

Review 3Floor PlanningComplete LayoutSPICE simulation

Floor Planning

Floor Planning

Floor Planning

Pinout

Final Layout

Simulation

Spice NetlistExported from MicrowindGot introduced to Tanner, Mentor Graphics

and SPICE syntaxReadings are taken from Mentor Graphics

Readings

Maximum AveragePower dissipation 0.622 mW 0.130 mW

Idd 0.519 mA 0.109 mAX to Z1 48.706 ps 38.347 psX to Z2 66.721 ps 40.2042 ps

Clk to Z1 49.974 ps 36.343 psClk to Z2 57.999 ps 38.493 ps

Core Size : 186.3 sq. umSupply : 1.2 V

SummaryXilinx ISE: – Verilog, RTL, Spartan 3 kit

DSCH: – Gate level, Transistor level

Microwind: – Floor planning, Layout

Mentor Graphics: – SPICE Simulation

ConclusionGreat learnings – VLSI Industry– Coregen Implementation– Verilog Coding

Better than Xilinx CoregenBetter than direct Verilog Implementation

ReferencesBasics Of CMOS Cell Design– Etienne Sicard, Sonia Delmas Bendhia

CMOS VLSI DESIGN : A Circuit and System Perspective– Neil H. E. Weste, David Harris, Ayan Banerjee

CMOS Digital Integrated Circuit,3/E– Sung-Mo-Kang, Yusuf Leblebici

ReferencesSpice User Manual Draft 10T-Spice 12 user guide– Tanner EDA tools

Open Source Semiconductor Core Licesing– Harvard Journal of Law and Technology

Digital Design 4th Edition– Morris Mano

Questions ??

Thank you !Prof. Usha Mehta Mr. Dharmesh Patel Mr. Prasann Shukla

Nirma University and All Professors– 4 years of great learning