The antifuse technology, routing architecture, logic mod- ule, design automation, programming, testing and use of ACTTM antifuse FPGA ‘s are described. FPGA Architectures Overview. In this short article we discuss modern FPGA architectures (SRAM-based, flash-based, antifuse- based) and their applications. Imperial College, Digital System Design. Actel FPGAs. ◇ Uses antifuse technology. ◇ Based on channelled gate array architecture as shown below.
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Antifuses may be used in programmable read-only memory PROM. Amorphous silicon is a material usually not used in either bipolar or CMOS processes and requires an additional manufacturing step. Certain programmable logic devices PLDssuch as structured ASICsuse antifuse technology to configure logic circuits and create a customized design from a standard Antiufse design.
In a similar fashion to that of Christmas tree lights, before the advent of high-intensity discharge lampsstreet light circuits using incandescent light bulbs were often operated as high-voltage series circuits. Views Read Edit View history. This technology has many applications. 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.
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 now applied to each of the remaining lamps.
This article needs additional citations for verification. When the bulb blows, the entire mains voltage is applied across the single blown lamp.
rpga From Wikipedia, the free encyclopedia. As the number of bonding pads is limited for a given size of the anrifuse, various multiplexing strategies are used for larger number of antifuses. May Learn how and when to remove this template message. 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.
This programming, performed after manufacturing, is permanent abtifuse irreversible. Also circuits built via the antifuse’s permanent conductive paths may be faster than similar circuits implemented in PLDs using SRAM technology. 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.
Dielectric antifuses employ a very thin oxide barrier between a pair of conductors. Unsourced material may be challenged and removed.
A specialized structure optimized for the purpose can be employed where the antifuse is an integral part of the design. Retrieved from ” https: Zener diodes can be used as antifuses. Because the series string would be rendered inoperable by a single lamp failing, each bulb has an antifuse installed within it.
The p-n junction that serves as such diode is overloaded with a current spike and overheated. In this way, the failed lamp was bypassed and illumination restored to the rest of the street. Their disadvantage, however, is lower area efficiency compared to other types.
antifuse Definition from PC Magazine Encyclopedia
They are historically used antifuze with bipolar processes, where the thin oxide needed for dielectric antifuses is not available. 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.
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.
The larger, traditional, C7 and C9 style lights are wired in parallel and are rated to operate directly at mains voltage. The antifuse is usually triggered using an approximately 5 mA current.
Formation of the conductive channel is performed by a dielectric breakdown forced by a high voltage pulse. Occasionally, the insulation fails to break down on its own, but tapping the blown lamp will usually finish the job. 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. 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.
They may be less susceptible to alpha particles which can cause circuits to malfunction. Please help improve this article by adding citations to reliable sources.