ANTIFUSE PROGRAMMING FPGAS PDF

FPGA (Field Programmable Gate Array) is an integrated circuit FPGA devices are produced by a number of semiconductor basic modes of programming: Antifuse-based FPGAs are different from the previous ones in that they can be. That is where the Field Programmable Gate Arrays (FPGAs) become of interest! They are hardware The antifuse programming technology is the simplest one. ❖The Programming technology. ❖The basic logic cells. ❖The I/O logic cells. ❖ Programmable interconnect. ❖Software to design and program the FPGA.

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Often a special bulb with no antifuse and often a slightly different rating so it blows first as the voltage gets too high known as a “fuse bulb” is incorporated into the string of lights to protect against the possibility of severe overcurrent if too many bulbs fail.

By using this site, you agree to the Terms of Use and Privacy Policy. The larger, traditional, C7 and C9 style lights are wired in parallel and are rated to operate directly at mains voltage.

As the number of bonding pads is limited for a given size of the chip, various multiplexing strategies are used for larger number of antifuses. May Learn how and when to remove this template message.

FPGAs in computer

This rapidly causes the antifuse to short out the blown bulb, allowing the series circuit to resume functioning, albeit with a larger proportion of the mains voltage progdamming applied to each of the remaining lamps. A specialized structure optimized for the purpose can be employed where the antifuse tpgas an integral part of the design. Antifuses are widely used to permanently program integrated circuits ICs. The resulting resistance of the junction is in the range of 10 ohms.

From Wikipedia, the free encyclopedia. An antifuse is an electrical device that performs the opposite function to a fuse. When the failed lamp was finally changed, a new piece of film was also installed, once again separating the electrical contacts in the cutout. When a sufficiently high voltage is applied across the amorphous silicon it is turned into a polycrystalline silicon-metal alloy with a low resistancewhich is conductive.

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Each bit contains both a fuse and an antifuse and is programmed by triggering one of the two. In some cases a combined circuit with zeners and transistors can be used to form a zapping matrix; with additional zeners, the trimming which uses voltages higher than the normal operational voltage of the chip can be performed even after packaging the chip. They are historically used especially with bipolar processes, where the thin oxide needed for dielectric antifuses is not available.

They may be less susceptible to alpha particles which can cause circuits to malfunction. Unlike Christmas lights, the circuit usually contained an automatic device to regulate the electric current flowing in the circuit, preventing the current from rising as additional lamps burned out. Zener zap is frequently employed in mixed-signal circuits for trimming values of analog components. The terminals of the antifuses are usually accessible as bonding pads and the pdogramming process is performed before wire-bonding and encapsulating the chip.

Their disadvantage, however, is lower area efficiency compared to other types. QuickLogic Corporation refers to their antifuses as “ViaLinks” because blown fuses create a connection between two crossing layers of wiring on the chip in the same way that a via on a printed circuit board creates a connection between copper layers. Occasionally, the insulation fails progra,ming break down on its own, but tapping the blown lamp will usually finish the job. Antifuses may be used in programmable read-only memory PROM.

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The antifuse is usually triggered using an approximately 5 mA current. This programming, performed after manufacturing, is permanent and irreversible.

Whereas a fuse starts with a low resistance and is designed to permanently break an electrically conductive path typically when the current through the path exceeds a specified limitan antifuse starts with a high resistance and is designed to permanently create an electrically conductive path typically when the voltage across the antifuse exceeds a certain level.

The antifuse is made using wire with a high resistance coating and this wire is coiled over the two vertical filament support wires inside the bulb. This article needs additional citations for verification.

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Antifuse – Wikipedia

In the same fashion as with the Christmas lights described above, if the lamp failed, the entire voltage of the ptogramming lighting circuit anrifuse of volts was imposed across the insulating film in the cutout, causing it to rupture. For example a precision resistor can be manufactured by forming several series resistors with Zeners in parallel oriented to be nonconductive during normal operation of the device and then shorting selected Zeners to shunt the unwanted resistors.

Each individual street-lamp was equipped with a film cutout ; a small disk of insulating film that separated two contacts connected to the two wires leading to the lamp. A standard NPN transistor structure is often used in common bipolar processes as the antifuse. Retrieved from ” https: In this way, the failed lamp was bypassed and illumination restored to the rest of the street. Ordinarily for operation from mains voltagesthe lamps are wired in series.

Articles needing additional references from May All articles needing additional references. Please help improve this article by adding citations to reliable sources. This technology has many applications. The p-n junction that serves as such diode is overloaded with a current spike and overheated.

Antifuses are best known for their use in mini-light or miniature style low-voltage Christmas tree lights. When the bulb blows, the entire mains voltage is applied across the single blown lamp.

The parallel resistors cannot have too low value as that would sink the zapping current; a series-parallel combination of resistors and antifuses is employed in such cases. Because the series string would be rendered inoperable by a single lamp failing, each bulb has an antifuse installed within it.

Formation of the conductive channel is performed by a dielectric breakdown forced by a high voltage pulse. This page was last edited on 7 Julyat Certain programmable logic devices PLDssuch as structured ASICsuse antifuse technology to configure logic circuits and create a customized design from a standard IC design.

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