Filter
Top Products
32 Intel Server Board S875WP1-E Product Guide
Real-Time Clock, CMOS SRAM, and Battery
The real-time clock provides a time-of-day clock and a multi-century calendar with alarm features.
The real-time clock supports 256 bytes of battery-backed CMOS SRAM in two banks that are
reserved for BIOS use.
A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer
is not plugged into a wall socket, the battery has an estimated life of three years. When the
computer is plugged in, the standby current from the power supply extends the life of the battery.
The clock is accurate to ± 13 minutes/year at 25 ºC with 3.3 VSB applied.
The time, date, and CMOS values can be specified in the BIOS Setup program. The CMOS values
can be returned to their defaults by using the BIOS Setup program.
✏ NOTE
If the battery and AC power fail, custom defaults, will be loaded into CMOS
RAM at power-on if they defaults have been previously saved.
Recovering the CMOS
In the unlikely event that the CMOS should be corrupt, it can be cleared by using a jumper setting
on the server board. To recover the CMOS and return the settings to the default value:
1. Power down the server and unplug all AC power cables.
2. Remove the cover from the chassis.
3. Move the jumper at jumper block J8G1 to cover pins 2 and three. For the location of jumper
block J8G1, see the figure below.
TP00200
J8G1
312
Figure 5. Location of Clear CMOS Jumper