EPM7256BFC256-5

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Complex Programmable Logic Devices (CPLDs) are highly integrated logic-gate chips that allow for flexible design of digital logic. The popular Xilinx Virtex-7 range of CPLDs underpin a wide range of applications, particularly in the field of embedded computing. This article will focus on one Xilinx Virtex-7 device, in particular the EPM7256BFC256-5, and will discuss its application field and working principle.

The EPM7256BFC256-5 is a high-density CPLD with 256 macrocell user-defined logic blocks, configurable through Xilinx’s conventional ISE (Integrated Software Environment). This device is particularly suited to very high-speed clocking and/or complex logic designs and provides very dense interconnecting routing. It is also fast and power efficient, making it an ideal candidate for applications requiring high performance or low power.

The key feature of the EPM7256BFC256-5 is its ability to deliver fast and precise digital feedback control. This involves the use of an oscillator and a programmable timer. The digital circuit will respond to pulses from the external oscillator and use that data to determine the timing of subsequent pulses. Using this mechanism the control loop can be tuned very precisely, enabling high frequency and extremely accurate control in real-time applications.

In addition to its use in digital feedback control, the EPM7256BFC256-5 has a wide range of application fields. These include field programmable gate arrays (FPGAs). This includes programmable logic controllers (PLCs), industrial process control systems, and a wide range of communication and data acquisition systems. It can also be used in medical imaging, automotive, aerospace and military systems.

The EPM7256BFC256-5 has a working principle which is similar to that of other CPLDs, with configurable logic blocks driving the I/O pins to give the desired logic operation. In this case, the logic blocks are connected through a combination of programmable interconnects and programmable lookup tables. External pins are connected to a programmed logic array cell (PLEC), where input and output signals can be tapped. To configure the logic blocks, the user simply selects the inputs, outputs and timing values, and the logic blocks are then configured accordingly. The logic structure that is developed is written to the device in the form of configuration bits.

The timing of the I/O pins on the EPM7256BFC256-5 can also be configured. This is done by programming the delay values between the input and output pins. This can be used to slow down the logic or to speed up the logic, depending on the application. The delay values can be shifted with the use of a programming algorithm so that the logic will still function correctly even when the frequency of the external clock used is changed.

In conclusion, the Xilinx Virtex-7 EPM7256BFC256-5 is a widely used CPLD that has numerous applications in a variety of fields. It has a fast digital feedback control system and can also be used as an FPGA. Its working principle is based on configurable logic blocks and programmable interconnects, allowing for both high performance and low power operation. It is therefore an ideal candidate for use in a variety of embedded applications.

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