Name
Description
Active Heatsink
The CRB provides mounting provisions and a fan header for an active
thermal solution.
Fan Headers
The CRB provides one fan header.
Solder Down Anchors
The CRB provides solder down anchors for the CRB and chipset. This
includes active heatsink mounting holes.
Heatsinks
The processor and CRB use an active heatsink design with a built-in fan, and the PCH
uses a passive heatsink. The active heatsink is powered by the platform. For details on
the processor and PCH heatsink, see the Thermal/Mechanical Design Guidelines. The
passive heatsink for the Intel
®
Communications Chipset 89xx Series requires no
power.
Physical and Mechanical Board Specifications
The CRB is approximately 12 inches long by 12 inches wide. It provides non-plated
mounting holes with top and bottom ground rings and requires users to use the acrylic
stand provided to avoid shorts.
1.8
Real Time Clock (RTC), CMOS SRAM, and Battery
A coin-cell battery (B1B1 type CR2032) powers the real-time clock (RTC) and CMOS
memory. The battery has an estimated life of three years when it is not plugged into a
wall socket. When the platform 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 VSTBY applied.
If the battery and AC power fail, then at boot-up the system will prompt you to either
load optimized defaults or enter the BIOS and manually adjust the BIOS settings.
1.9
On-Board Peripheral Components
Table 4.
On-Board Peripheral Components
Ref Des
Location
Description
U5F1/U3E1
Clock Generator / Clock
Buffer
CK420 Clock Generator/ DB1900 Clock Buffer
U3A2
SuperI/O*
The SIO (WPCD376I) is driven by the PCH Low Pin Count
(LPC) bus.
U2K1/U2K2
SPI Flash
16 MB socket with footprint for 8-pin devices (primary boot,
Intel
®
Communications Chipset 89xx Series FW storage,
BIOS etc.)
S6A1
Power Button
System power button
S7A1
Reset Button
System reset button
U1K1
Port 80 Logic Device
Altera* EPM570_100P
DS2K1/DS2K2
Port 80 Code Display
Two digit, 7-segment LED character displays
continued...
Introduction—Crystal Forest
Intel
®
Xeon
®
Processor E3-1125C with Intel
®
Communications Chipset 8910 Development Kit
October 2012
User Guide
Order No.: 328009-001US
13