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Hello everyone, today we will learn about the standby conditions
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in the standard timing of Loongson's LS7A1000 chipset
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First, let's take a look at this timing diagram
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In this timing diagram, the condition in the previous part is the standby condition
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The first one is called RTC_3V, which is the power supply of the RTC circuit, normally 3.3V,
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usually provided by a button battery, or by the standby power supply in the motherboard
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The second condition RTC_RTCRSTn, this is the reset signal of the RTC circuit, 3.3V
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The third condition is ACPI_3V3, which is the main standby power supply 3.3V
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VDD_RSM which is also the main standby power supply 1.1 volts
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Next, RTC_RSMRSTn is the good signal of the main standby power supply, 3.3V
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The name of this signal is followed by the letter "n", indicating that this signal is active low
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For example, ACPI_BATLOWn, this signal is a low battery indicator signal
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It includes battery power supply and power supply, the accurate meaning of this signal should be PWRLOWn
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Whether it is battery-powered or power-powered, when this signal is low,
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it means that the battery is low, normally 3.3V
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The signal name is followed by "n" to indicate active low
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ACPI_PWRBTNn is the power switch signal
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During normal standby, it is 3.3V high level
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When we press the switch, it will be pulled down to low level,
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and it will return to high level after releasing the switch
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We call this a "high-low-high" transition
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Next, VSB_GATEn is the main power and Standby power switching signal
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Well, these are the standby conditions for the Loongson LS7A1000 chipset