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313079-001 Datasheet(PDF) 86 Page - Intel Corporation |
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313079-001 Datasheet(HTML) 86 Page - Intel Corporation |
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86 / 104 page  Features 86 Dual-Core Intel® Xeon® Processor 5000 Series Datasheet RESET# will cause the processor to immediately initialize itself, but the processor will stay in Stop-Grant state. A transition back to the Normal state will occur with the de- assertion of the STPCLK# signal. A transition to the Grant Snoop state will occur when the processor detects a snoop on the front side bus (see Section 7.2.4.1). While in the Stop-Grant state, SMI#, INIT#, BINIT# and LINT[1:0] will be latched by the processor, and only serviced when the processor returns to the Normal state. Only one occurrence of each event will be recognized upon return to the Normal state. While in Stop-Grant state, the processor will process snoops on the front side bus and it will latch interrupts delivered on the front side bus. The PBE# signal can be driven when the processor is in Stop-Grant state. PBE# will be asserted if there is any pending interrupt latched within the processor. Pending interrupts that are blocked by the EFLAGS.IF bit being clear will still cause assertion of PBE#. Assertion of PBE# indicates to system logic that it should return the processor to the Normal state. 7.2.4 Enhanced HALT Snoop or HALT Snoop State, Stop Grant Snoop State The Enhanced HALT Snoop state is used in conjunction with the Enhanced HALT state. If the Enhanced HALT state is not enabled in the BIOS, the default Snoop state entered will be the HALT Snoop state. Refer to the sections below for details on HALT Snoop state, Stop Grant Snoop state and Enhanced HALT Snoop state. 7.2.4.1 HALT Snoop State, Stop Grant Snoop State The processor will respond to snoop or interrupt transactions on the front side bus while in Stop-Grant state or in HALT Power Down state. During a snoop or interrupt transaction, the processor enters the HALT/Grant Snoop state. The processor will stay in this state until the snoop on the front side bus has been serviced (whether by the processor or another agent on the front side bus) or the interrupt has been latched. After the snoop is serviced or the interrupt is latched, the processor will return to the Stop-Grant state or HALT Power Down state, as appropriate. 7.2.4.2 Enhanced HALT Snoop State The Enhanced HALT Snoop state is the default Snoop state when the Enhanced HALT state is enabled via the BIOS. The processor will remain in the lower bus ratio and VID operating point of the Enhanced HALT state. While in the Enhanced HALT Snoop state, snoops and interrupt transactions are handled the same way as in the HALT Snoop state. After the snoop is serviced or the interrupt is latched, the processor will return to the Enhanced HALT state. 7.3 Enhanced Intel SpeedStep® Technology The Dual-Core Intel Xeon Processor 5000 series support Enhanced Intel SpeedStep Technology. This technology enables the processor to switch between multiple frequency and voltage points, which results in platform power savings. Enhanced Intel SpeedStep Technology requires support for dynamic VID transitions in the platform. Switching between voltage/frequency states is software controlled. |
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