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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In the same fashion as with the Christmas lights described above, if the lamp failed, the entire voltage of the street lighting circuit thousands of volts was imposed across the insulating film in the cutout, causing it to rupture.

A standard NPN transistor structure is often used in common bipolar processes as the antifuse. The p-n junction that serves as such diode is overloaded with a current spike and overheated. Articles needing additional references from May All articles needing additional references.

The insulation of the antifuse wire withstands the ordinary low voltage imposed across a functioning lamp but rapidly breaks down under the full mains voltage, giving the antifuse action. Dielectric antifuses employ a very thin oxide barrier between a pair of conductors. This page was last edited on 7 Julyat 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.

Views Read Edit View history. Retrieved from ” https: Amorphous silicon is a material usually not used in either bipolar or CMOS processes and requires an additional manufacturing step. 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.

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FPGAs in computer

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. 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.

fpgqs By using this site, you agree to the Terms of Use and Privacy Policy. By this approach, it is possible only to lower the value of the resulting resistor.

An antifuse is an electrical device that performs the opposite function to a fuse. Antifuses are best known for their use in mini-light or miniature style low-voltage Christmas tree lights.

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.

Their disadvantage, however, is lower area efficiency compared to other types. The terminals of the antifuses are usually accessible as bonding pads and the trimming process is performed before wire-bonding and encapsulating the chip.

They may be less susceptible to alpha particles which can cause circuits to malfunction. When the bulb blows, the entire mains voltage is applied across the single blown lamp. 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. Progfamming programming, performed after manufacturing, is permanent and irreversible. This technology has many applications. Formation of the conductive channel is performed by a dielectric breakdown forced by a high voltage pulse.

For example a precision resistor can be manufactured by forming several series resistors with Zeners in parallel oriented to be nonconductive during antfiuse operation of the device and then shorting selected Zeners to antjfuse the unwanted resistors.

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The resulting resistance of the junction is in the range of 10 ohms. The conductive shunt therefore does not compromise integrity and reliability of the semiconductor device.

Because the series string would be rendered inoperable by a single lamp failing, each bulb has an antifuse installed within it.

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 prohramming out. Zener zap is frequently employed in mixed-signal circuits for trimming values of analog components. It is therefore necessary to shift the manufacturing tolerances so that the lowest-value typically made is equal to or larger than the desired value.

Antifuse – Wikipedia

The larger, traditional, C7 and C9 style lights are wired in parallel and are rated to operate directly at mains voltage. 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.

Zener diodes can be used as antifuses. In a similar fashion to that of Christmas tree lights, before the advent of high-intensity discharge lampsprogrammign light circuits using incandescent light bulbs were often operated as high-voltage series circuits.

Ordinarily for operation from mains voltagesthe lamps are wired in series.

Each bit contains both a fuse and an antifuse and is programmed by triggering one of the two. May Learn how and when to remove this template message.

Antifuses may be used in programmable read-only memory PROM. Please help improve this article by adding citations antiifuse reliable sources.