Fpga Dram; Internal Real-Time Clock; Cmos Battery; File System - National Instruments NI cRIO-9039 User Manual

to the chassis grounding terminal. Solder the other end of the wire to the cable
shield. Use shorter wire for better EMC performance.
For more information about ground connections, visit
.
emcground

FPGA DRAM

The cRIO-9039 contains onboard dynamic random-access memory (DRAM) that is directly
accessible from the LabVIEW FPGA VI. The DRAM supplements the internal block RAM of
the FPGA and provides high-bandwidth memory that you can use in your LabVIEW FPGA
application.
Find DRAM memory integrity and memory throughput examples for LabVIEW FPGA in the
NI Example Finder. The NI Example Finder is located on the Help menu in the LabVIEW
Help.
Refer to the specifications on
theoretical bandwidth. Refer to LabVIEW Help for information on effectively using the
DRAM interface.

Internal Real-Time Clock

The cRIO-9039 contains an internal real-time clock that maintains system time when the
cRIO-9039 is powered off. The system clock of the cRIO-9039 is synchronized with the
internal real-time clock at startup. You can set the real-time clock using the BIOS setup utility
or MAX, or you can set the clock programmatically using LabVIEW.
Refer to the specifications on

CMOS Battery

The cRIO-9039 contains a CMOS battery. The CMOS battery is a lithium cell battery that
stores the system clock information when the cRIO-9039 is powered off. There is only a slight
drain on the CMOS battery when power is applied to the cRIO-9039 power connector. The
rate at which the CMOS battery drains when power is disconnected depends on the ambient
storage temperature. For longer battery life, store the cRIO-9039 at a cooler temperature and
apply power to the power connector. Refer to the specifications on
expected battery lifetime.
The
CMOS BATTERY IS DEAD
battery is dead. The cRIO-9039 still starts, but the system clock is reset to the date and time of
the BIOS release. The battery is not user-replaceable. If you need to replace the CMOS
battery, contact NI. Refer to the specifications on
battery disposal.

File System

LabVIEW mounts USB devices and SD cards to the
symbolic links
/u
To prevent any file corruption to external storage devices, verify that any file IO operations
with the specific drive finish before removing the device. Refer to the LabVIEW Help for more
information.
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warning appears onscreen during the power-on self test if the
, , , or to the media mount point, starting with
/v /w /x
ni.com/info and enter the Info Code
for the DRAM density and the maximum
for the real-time clock accuracy specifications.
ni.com/manuals
ni.com/manuals for information about
directory and creates
media/sdx1
for the
if it is available.
/u