Xilinx KCU116 - Chapter 3: Board Component Descriptions; Overview; Component Descriptions; Kintex Ultrascale+ XCKU5 P-2 FFVB676 E Device

KCU116 Board User Guide 16
UG1239 (v1.2) September 28, 2018 www.xilinx.com
Chapter 3
Board Component Descriptions
Overview
This chapter provides a detailed functional description of the board’s components and
features. Table 2-1, page 10 identifies the components, references the respective schematic
page numbers, and links to the corresponding detailed functional description in this
chapter. Component locations are shown in Table 2-1, page 10.
Component Descriptions
Kintex UltraScale+ XCKU5P‐2FFVB676E Device
[Figure 2-1, callout 1]
The KCU116 board is populated with the Kintex
®
UltraScale+
™
XCKU5P-2FFVB676E device.
For more information on Kintex UltraScale+ FPGAs, see Kintex UltraScale+ FPGAs Data
Sheet: DC and AC Switching Characteristics (DS922) [Ref 1].
Encryption Key Battery Backup Circuit
The XCKU5P device U1 implements bitstream encryption key technology. The KCU116
board provides the encryption key backup battery circuit shown in Figure 3-1. The Seiko
TS518FE rechargeable 1.5V lithium button-type battery B1 is soldered to the board with the
positive output connected to the XCKU5P device U1 VCCBATT pin Y9. The battery supply
current I
BATT
specification is 150 nA maximum when the board power is off. B1 is charged
from the SYS_1V8 1.8V rail through a series diode with a typical forward voltage drop of
0.38V and 4.7 K current limit resistor. The nominal charging voltage is 1.42V.
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