fpga based system design unit-2

Unit -2FPGA Technology FPGA resources - Logic Blocks and Interconnection Resources;

Economics and applications of FPGAs;

Implementation Process for FPGAs Programming Technologies - StaticRAM Programming, Anti Fuse Programming, EPROM and EEPROMProgramming Technology;

Commercially available FPGAs - Xilinx FPGAs, Altera FPGAs;

FPGA Design Flow Example - Initial Design Entry, Translation to XNFFormat, Partitioning, Place and Route,

Performance Calculation and Design Verification

5/8/2011Raghavendra S Solanky1

FPGA Resources Logic Blocks

Interconnection Resources


Logic Blocks The basic unit of FPGA that performs the combinational and

sequential logic functions.

The structure and content of a logic block are called itsArchitecture (Logic Block Architecture).

Logic Block Architecture – the choice of combinationaland sequential functions of the logic block and theirinterconnection with in block.


Logic Blocks Logic blocks are as simple as 2-input NAND gate. Other

blocks have more complex structure such as multiplexer or lookup tables.

Most logic blocks also contain some type of flip flop to aid in the implementation of sequential circuits.

Logic block architecture shows the effect on both the total chip area needed to build an FPGA and speed performance of circuits implemented in an FPGA.


Logic Block Architecture MUX – Based Lookup table - based


MUX Based Logic Block

Example


Lookup Table Based


Interconnected Resources


The structure and content of the interconnect in an FPGA is called its routing architecture.

Routing Architecture – Wire SegmentProgrammable Switches

SRAM, Anti-fuse, EPROM, EEPROM etc.

Made by

Unit -2FPGA Technology FPGA resources - Logic Blocks and Interconnection Resources

Economics and applications of FPGAs

Implementation Process for FPGAs Programming Technologies - StaticRAM Programming, Anti Fuse Programming, EPROM and EEPROMProgramming Technology

Commercially available FPGAs - Xilinx FPGAs, Altera FPGAs

FPGA Design Flow Example - Initial Design Entry, Translation to XNFFormat, Partitioning, Place and Route, Performance Calculation andDesign Verification



FPGA vs MPGA Advantages Lower prototype costs Shorter production time

Disadvantages Low speed Lower logic density - the amount of logic that can be

implemented in a single chip


FPGA vs MPGA


Applications of FPGA Application Specific Integrated Circuits (ASICs) Implementation of Random Logic Prototype ASIC Design Replacement of SSI Chips by FPGAS FPGA - Based Compute Engines DSP applications

Software-defined radio, Aerospace and Defence systems, Medicalimaging, Computer vision, Speech recognition, cryptography,bioinformatics, computer hardware emulation, radio astronomy,metal detection and a growing range of other areas.


Implementation Process for FPGAs Programming Technologies

Fuse Programming Anti Fuse Programming Static RAM Programming EPROM and EEPROM

Implementation Process

Programming TechnologyThe fundamental method of customization in an FPGA that provides the user-programmabilityExamples-


Fusible Link Technology


One time programmable

Low Resistant

Anti – Fuse Technology


high Resistant works as open circuit

Amorphous silicon acts as a Insulator(1 billion ohm)

One time programmable

SRAM based Technology


DRAM Technology ?

Reprogrammable

Advantage - Reprogram quickly and easilyDisadvantages- SRAM cell contain 6 transistor

Data lost when power is removed from the system.

EPROM Technology


EEPROM Technology


fpga based system design unit-2

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