GE VR11, Справочное руководство

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CHAPTER 7
Function Blocks
Chapter Scope
This section gives a brief overview of the VR11 VME Single Board Computer
onboard devices software interfaces.
Processor
The Intel Core / Core 2 processor family provides high performance with low
power and features Enhanced Intel SpeedStep® technology which
provides the
ability to dynamically adjust the power and performance of the processor based
on CPU demand. This results in optimal performance without compromising
the power performance of the VR11.
The processor die is thermally protected by two thermal monitor features.
When reaching a maximum safe operating temperature the Thermal Control
Circuit in the processor activates a frequency reducing feature and reduces the
voltage and frequency dynamically. If this feature is active, the VR11 will
indicate it with short clicks at the speaker. In case of a catastrophic die
overheating (above 125 °C), the VR11 switches off the processor core voltage.
Recovery from this catastrophic event can be done with a power off-on cycle
only.
Memory Controller
The dual channel memory controller in the VR11 supports double data rate
synchronous DRAM (DDR2) with a data bus width of 64 bits + ECC. One, two
or four banks are provided by the VR11 with a size of either 512 MByte or
1024 MByte. This results in a minimum memory size of 512 MByte and a
maximum size of 4 GByte.
Interrupt Controller
The Interrupt controller on a standard PC consists of two 82C59A devices with
eight interrupt request lines each. The two controllers are cascaded so that 14
external and two internal interrupt sources are available. The master interrupt
GE Intelligent Platforms – VR11, VP11 Hardware Reference Manual, Second Edition Page 67