PC4-PRESTO • CompactPCI
®
PlusIO • 4
th
Generation Intel
®
Core™-4xxx Processor
Real-Time Clock
The PC4-PRESTO has a time-of-day clock and 100-year calendar, integrated into the QM87 PCH. A
battery on the board keeps the clock current when the computer is turned off. The PC4-PRESTO uses
a holder to keep a BR2032 lithium coin cell, giving an autonomy of more than 5 years. Under normal
conditions, replacement should be superfluous during lifetime of the board.
Alternately a BR2032 battery can be soldered in the board when board coating or shock/vibration is
an interest.
In applications were the use of a battery is not permitted, a SuperCap can be soldered instead of the
battery.
SPI Flash
The UEFI and iAMT firmware is stored in flash devices with Serial Peripheral Interface (SPI). Up to
16MByte of code, firmware and user data may be stored nonvolatile in these SPI Flashes.
The SPI Flash contents can be updated by a DOS or Linux based tool. This program and the latest
PC4-PRESTO UEFI binary are available from the EKF website. Read carefully the enclosed instructions.
If the programming procedure fails e.g. caused by a power interruption, the PC4-PRESTO may no
more be operable. In this case you would possibly have to send in the board, because the Flash
device is directly soldered to the PCB and cannot be changed by the user.
© EKF -30- ekf.com
