Xilinx AC701 User Manual page 14

Chapter 1: AC701 Evaluation Board Features
For full details on configuring the FPGA, see 7 Series FPGAs Configuration User Guide (UG470)
[Ref
Encryption Key Backup Circuit
FPGA U1 implements bitstream encryption key technology. The AC701 board provides the
encryption key backup battery circuit shown in
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
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 1-4
I/O Voltage Rails
In addition to Bank 0, there are eight I/O banks available on the Artix-7 device. The voltages applied
to the FPGA I/O banks used by the AC701 board are listed in
Table 1-3: FPGA Bank Voltage Rails
Bank 0
Bank 12
Bank 13
Bank 14
Bank 15
Bank 16
Bank 33
14
Send Feedback
6].
Figure 1-4: Encryption Key Backup Circuit
Power Supply Rail
U1 FPGA Bank
Net Name
FPGA_3V3
VCCO_VADJ
FPGA_1V8
FPGA_3V3
VCCO_VADJ
VCCO_VADJ
FPGA_1V5
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Figure 1-4. The rechargeable 1.5V lithium
specification is 150 nA maximum when
BATT
NC
1
VCC1V8 (1.8V)
D6
40V
3
200 mW
BAS40-04
2
1
R83
4.70K 5%
1/10W
2
FPGA_VBATT
1
B1
+
1.5V
Seiko
TS518SE_FL35E
2
GND
UG952_c1_04_092812
Voltage
3.3V
2.5V
1.8V
3.3V
2.5V
2.5V
1.5V
Table 1-3.
AC701 Evaluation Board
UG952 (v1.4) August 6, 2019