VL-EPU-3311 Reference Manual
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Board Features
CPU
The Intel Atom E38xx SoC features integrated 3D graphics, video encode and decode, and
memory and display controllers in one package. The following CPU configurations are
available:
VL-EPU-3311-EAP: Intel Atom 3815 – 1.46 GHz, Single Core
VL-EPU-3311-EBP: Intel Atom 3827 – 1.75 GHz, Dual Core
VL-EPU-3311-EDP: Intel Atom 3845 – 1.91 GHz, Quad Core
CPU Die Temperature
The CPU die temperature is affected by numerous conditions, such as CPU utilization, CPU
speed, ambient air temperature, air flow, thermal effects of adjacent circuit boards, external heat
sources, and many others.
The thermal management for the Intel Atom E38xx series of processors consists of a sensor
located in the core processor area. The processor contains multiple techniques to help better
manage thermal attributes of the processor. It implements thermal-based clock throttling and
thermal-based speed step transitions. There is one thermal sensor on the processor that triggers
Intel's thermal monitor (the temperature at which the thermal sensor triggers the thermal monitor
is set during the fabrication of the processor). Triggering of this sensor is visible to software by
means of the thermal interrupt LVT entry in the local APIC. (See the
System RAM
The Osprey has soldered-on SDRAM with the following characteristics:
Table 2: Osprey Memory Characteristics
Board Model
Memory Type
Capacity
Data Rate
VL-EPU-3311-EAP
DDR3L
2 GB
1066 MT/s – Single Channel
VL-EPU-3311-EBP
DDR3L
2 GB
1333 MT/s – Dual Channel
VL-EPU-3311-EDP
DDR3L
4 GB
1333 MT/s – Dual Channel
Flash Storage
The Osprey provides on-board eMMC Flash storage on certain models of the product:
VL-EPU-3311-EAP: none
VL-EPU-3311-EBP: 4 GB
VL-EPU-3311-EDP: 8 GB
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