Bus access method

Abstract

The invention discloses a method for accessing a bus, which comprises the following steps: receiving a command; judging whether the command is a bus master command or not, and generating a judging result; transmitting at least one interrupt event to switch a processor in a non-snoop state into a spoon state according to the judging result; and transmitting at least one bus master request so as toaccess the bus, wherein the interrupt event is earlier than the corresponding bus master request in the timing sequence.

Description

technical field [0001] The present invention relates to a method for accessing a bus, in particular to a method for accessing the bus controlled by a processor in a power-saving mode that is woken up in advance. Background technique [0002] In the known field, the standby time of a portable electronic product often determines the popularity of the electronic product. However, in a notebook computer, the performance of its processor is often directly proportional to its power consumption, that is, the notebook computer cannot process work with high performance while maintaining low power consumption. Generally, the power state of a processor can be divided into several states: C0, C1, C2, C3, C4, C3 pop-up / pop-down (C3 Pop-up / Pop-down) and other states, wherein when the processor is in the C0 state , which has the highest processing performance, and of course its corresponding power consumption is also the highest. The C1 state is an auto-halt state. In the C1 state, the ...

AI Technical Summary

Problems solved by technology

However, in a notebook computer, the performance of its processor is often directly proportional to its power consumption, that is to say, the notebook computer cannot handle work with high performance while maintaining low power consumption.

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