how-to-configure-an-fpga-part1

how-to-configure-an-fpga-part1 - Basic FPGA Configuration...

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FPGA and ASIC Technology Comparison - 1 © 2009 Xilinx, Inc. All Rights Reserved Basic FPGA Configuration Part 1
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Welcome If you are new to FPGA design, this module will help you understand the configuration process These configuration techniques apply to all of Xilinx’s newest FPGAs, including Spartan-6 and Virtex-6
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Describe the purpose of each of the FPGA configuration pins Explain the differences between the available configuration schemes Choose an appropriate FPGA configuration scheme for your application After completing this module, you will able to:
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© 2007 Xilinx, Inc. All Rights Reserved FPGA and ASIC Technology Comparison - 4 © 2009 Xilinx, Inc. All Rights Reserved Introduction What is configuration? Process for loading configuration data into the FPGA Configuration Data Source Configuration Data Source FPGA FPGA Control Logic (Optional) Control Logic (Optional)
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© 2007 Xilinx, Inc. All Rights Reserved FPGA and ASIC Technology Comparison - 5 © 2009 Xilinx, Inc. All Rights Reserved Introduction When does configuration happen? On power up On demand Why do FPGAs need to be configured? FPGA configuration memory is volatile Configuration data is stored in a PROM or other external data source What do you need to know about FPGA configuration? What happens during configuration How to set up various configuration modes and daisy chains
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© 2007 Xilinx, Inc. All Rights Reserved FPGA and ASIC Technology Comparison - 6 © 2009 Xilinx, Inc. All Rights Reserved FPGA FPGA FPGA Configuration Methods Xilinx Cables : JTAG Slave Serial Slave SelectMAP Microprocessor : JTAG Slave Serial Slave SelectMAP Xilinx PROMs : Slave/Master Serial Slave/Master SelectMAP Commodity Flash : Slave SelectMAP SPI* BPI* *SPI and BPI support is available in Spartan™-6, Virtex™-6, and some older FPGA families
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© 2007 Xilinx, Inc. All Rights Reserved FPGA and ASIC Technology Comparison - 7 © 2009 Xilinx, Inc. All Rights Reserved FPGA Configuration Process To understand the configuration process, you need to know about… Configuration pins – define the configuration mode Some configuration pins are inputs (active switches), while others are outputs (status indicators) Configuration modes – is the current configuration scheme FPGA designs can support multiple configuration modes This will require the user to build additional control logic to drive the configuration pins Be careful , many debugging issues involve multiple configuration modes being used at one time
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© 2007 Xilinx, Inc. All Rights Reserved FPGA and ASIC Technology Comparison - 8 © 2009 Xilinx, Inc. All Rights Reserved Configuration Pins Specific pins on the FPGA are used during configuration Some pins act differently depending on the configuration mode Example: CCLK is an output in some modes and an input in others Some pins are only used in specific configuration modes
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© 2007 Xilinx, Inc. All Rights Reserved FPGA and ASIC Technology Comparison - 9 © 2009 Xilinx, Inc. All Rights Reserved Configuration Pins Mode pins (3) Input pin(s) that select which configuration mode is being used PROGRAM_B
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