CONV-BLK-XM-UT3 Lattice

Block Convolutional Encoder Users Guide June 2010 IPUG31 03.5Table of Contents Chapter 1. Introduction .......................................................................................................................... 4 Quick Facts ........................................................................................................................................................... 4 Features ................................................................................................................................................................ 6 Chapter 2. Functional Description ........................................................................................................ 7 General Description .............................................................................................................................................. 7 Convolutional Encoding ............................................................................................................................... 7 Punctured Codes ......................................................................................................................................... 8 Continuous and Block Encoding .................................................................................................................. 9 Zero Flushing and Tail Biting Termination Modes........................................................................................ 9 Functional Description........................................................................................................................................... 9 Encoder........................................................................................................................................................ 9 Puncture Unit ............................................................................................................................................. 10 Input Memory ............................................................................................................................................. 10 Control Unit ................................................................................................................................................ 10 Interfacing to the Block Convolutional Encoder Core.......................................................................................... 10 Signal Descriptions ............................................................................................................................................. 11 Timing Diagrams ................................................................................................................................................. 12 Chapter 3. Parameter Settings ............................................................................................................ 19 Block Convolutional Encoder Parameters........................................................................................................... 20 Code Rate.................................................................................................................................................. 20 Operation Mode ......................................................................................................................................... 21 Puncture Support ....................................................................................................................................... 21 Termination Mode ...................................................................................................................................... 21 Block Length Options................................................................................................................................. 21 Generator Polynomials............................................................................................................................... 21 Chapter 4. IP Core Generation............................................................................................................. 22 Licensing the IP Core.......................................................................................................................................... 22 Getting Started.................................................................................................................................................... 22 IPexpress-Created Files and Top Level Directory Structure............................................................................... 25 Instantiating the Core.......................................................................................................................................... 26 Running Functional Simulation ........................................................................................................................... 26 Synthesizing and Implementing the Core in a Top-Level Design ....................................................................... 27 Hardware Evaluation........................................................................................................................................... 28 Enabling Hardware Evaluation in Diamond:............................................................................................... 28 Enabling Hardware Evaluation in ispLEVER:............................................................................................. 28 Updating/Regenerating the IP Core .................................................................................................................... 28 Regenerating an IP Core in Diamond ........................................................................................................ 28 Regenerating an IP Core in ispLEVER ...................................................................................................... 29 Chapter 5. Support Resources ............................................................................................................ 30 Lattice Technical Support.................................................................................................................................... 30 Online Forums............................................................................................................................................ 30 Telephone Support Hotline ........................................................................................................................ 30 E-mail Support ........................................................................................................................................... 30 Local Support............................................................................................................................................. 30 Internet....................................................................................................................................................... 30 References.......................................................................................................................................................... 30 LatticeEC/ECP ........................................................................................................................................... 30 LatticeECP2M ............................................................................................................................................ 30 LatticeECP3 ............................................................................................................................................... 31 2010 Lattice Semiconductor Corp. All Lattice trademarks, registered trademarks, patents, and disclaimers are as listed at www.latticesemi.com/legal. All other brand or product names are trademarks or registered trademarks of their respective holders. The specifications and information herein are subject to change without notice. IPUG31 03.5, June 2010 2 Block Convolutional Encoder Users Guide