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10 www.xilinx.com AC701 Evaluation Board

UG952 (v1.1) January 30, 2013

Chapter 1: AC701 Evaluation Board Features

The default mode setting is M[2:0] = 001, which selects Master SPI at board power-on.

Refer to the

Configuration Options, page 75 for more information about the mode switch

SW1.

For full details on configuring the FPGA, see UG470, 7 Series FPGAs Configuration User

Guide

Encryption Key Backup Circuit

FPGA U1 implements bitstream encryption key technology. The AC701 board provides the

encryption key backup battery circuit shown in

Figure 1-4. The rechargeable 1.5V lithium

button-type battery B1 is soldered to the board with the positive output connected to

FPGA U1 VCCBATT pin G14. The battery supply current I

BATT

specification is 150 nA max

when board power is off. B1 is charged from the VCC1V8 1.8V rail through a series diode

with a typical forward voltage drop of 0.38V. and 4.7 KΩ current limit resistor. The nominal

charging voltage is 1.62V.

X-Ref Target - Figure 1-3

Figure 1-3: SW1 Default Settings

Table 1-2: AC701 Board FPGA Configuration Modes

Configuration

Mode

SW1 DIP switch

Settings (M[2:0])

Bus

Width

CCLK

Direction

Master SPI 001 x1, x2, x4 Output

JTAG 101 x1 Not Applicable

R339

1.21K 1%

1/10W

R338

1.21K 1%

1/10W

R337

1.21K 1%

1/10W

FPGA_3V3

SW1

SDA03H1SBD

FPGA_M2

FPGA_M1

FPGA_M0

UG952_c1_03_011713

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 106 107

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