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The FPGA configuration data is stored in files called bitstreams that have the. An on-board вЂњmodeвЂќ jumper (JP1) and a media selection jumper (JP2) select between the programming modes. Typical currents depend strongly on FPGA configuration and the values provided are typical of medium size/speed designs.ДЄ programming file can be transferred from a USB memory stick attached to the USB HID port.ДЇigure 2.1 Nexys A7 Configuration OptionsДЇigure 2.1 shows the different options available for configuring the FPGA. Table 1.1 provides additional information. Voltage regulator circuits from Analog Devices create the required 3.3V, 1.8V, and 1.0V supplies from the main power input. In other cases, the minimum voltage is 3.6V. The minimum voltage of the battery pack depends on the application: if the USB Host function (J5) is used, at least 4.6V needs to be provided. Since the main regulator on the Nexys A7 cannot accommodate input voltages over 5.5VDC, an external battery pack must be limited to 5.5VDC. Many suitable supplies can be purchased from Digilent, through Digi-Key, or other catalog vendors.ДЄn external battery pack can be used by connecting the batteryвЂ™s positive terminal to the center pin of JP3 and the negative terminal to the pin labeled J12, directly below JP3. The supply must use a coax, center-positive 2.1mm internal-diameter plug, and deliver 4.5VDC to 5.5VDC and at least 1A of current (i.e., at least 5W of power). In these instances, an external power supply or battery pack can be used.ДЄn external power supply can be used by plugging into to the power jack (J13) and setting jumper JP3 to вЂњWALLвЂќ. Also, some applications may need to run without being connected to a PCвЂ™s USB port. A few demanding applications, including any that drive multiple peripheral boards, might require more power than the USB port can provide. Our out-of-box demo draws ~400mA of current from the 5V input rail. In order to power the board from USB port set jumper JP3 to вЂњUSBвЂќ. The USB port can deliver enough power for the vast majority of designs. An overview of the Nexys A7 power circuit is shown in Figure 1.1. A power-good LED (LD22), driven by the вЂњpower goodвЂќ output of the ADP2118 supply, indicates that the supplies are turned on and operating normally.

Jumper JP3 (near the power jack) determines which source is used.ДЄll Nexys A7 power supplies can be turned on and off by a single logic-level power switch (SW16).

The Nexys A7 board can receive power from the Digilent USB-JTAG port (J6) or from an external power supply.

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