3-Feb-2015
Figure 11 – XADC Power Configuration
2.10.8 Battery Backup - Device Secure Boot Encryption Key
Zynq power rail V
CCBATT
is a 1.0V to 1.89V voltage typically supplied by a battery. This supply is
used to maintain an encryption key in battery-backed RAM for device secure boot. The encryption
key can alternatively be stored in eFuse which does not require a battery.
As specified in the Zynq TRM, if the battery is not used, connect V
CCBATT
to either ground or
V
CCAUX
. On PicoZed, V
CCBATT
is connected to net FPGA_VBATT and is tied through a 0 Ω resistor
(R14) to the PicoZed V
CCAUX
supply, which is 1.8V. However, FPGA_VBATT is also extended to
the end user carrier card. To apply an external battery to Zynq from the end user carrier card, the
0-ohm resistor, R14, should be removed from the PicoZed System-On-Module.
2.10.9 Cooling Fan
An unpopulated-header JP1, labeled FAN, is available in the event a fan is needed for high
performance designs. This header provides two ground connections and one connection to the
VIN voltage. PicoZed 7010/7020 also provides a resistor option for a 3.3V fan via JT3. Two
mounting holes (MTG[3:4]) near the Zynq device are provided where an active or passive heat
sink might be secured.
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