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This lesson talks about the baseband circuit of Huawei models with independent baseband

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Huawei's models with independent basebands are nova 6 and Honor V30

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Let's take a look at the framework of Huawei's baseband

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First look at what components this circuit contains

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First of all, it revolves around the baseband CPU, and the baseband storage,

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which is the running memory of the baseband CPU

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This is the power supply of the baseband, this is a small power supply chip,

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which is the small power supply of the baseband

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It also has a 38.4 MHz crystal

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This charging chip mainly provides the main power supply to the baseband power supply

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The following is the clock chip, which mainly generates the clock signal

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The one on the right is the big CPU, that is, the main CPU

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In the lower right corner here is the radio frequency transceiver

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The baseband communicates with the RF transceiver on the Qlink bus

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Let's see how it works

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The baseband power supply converts the main power supply into various power supplies for the baseband running memory and baseband CPU

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The clock chip generates a clock signal to the baseband CPU

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At the same time, the baseband power supply resets the baseband CPU, and the baseband CPU loads the boot program to run

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If there is no problem with the operation, the maintenance signal will be output, PMU_HOLD

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Of course, the baseband power supply here also comes from a power supply generated by the clock chip, LDO 8,

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and a 0.75 volt power supply provided by the small power supply chip

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High-speed data is transmitted between the baseband CPU and the running memory through the CA or DQ bus

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The baseband CPU performs data communication with the large CPU through the PCIe bus,

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and performs data communication with the RF transceiver through the Qlink bus

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This is its reset signal

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This is its maintenance signal

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This is the control bus, the baseband CPU controls the baseband power supply

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This is the clock on signal

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This is the overall circuit structure of Huawei's baseband circuit

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In maintenance, there are many working conditions,

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including the power supply provided by the baseband power supply,

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the clock signal output by the clock chip, the power supply provided by the small power supply,

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the reset signal provided by the baseband power supply,

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and the data communication between the baseband CPU and the running memory,

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data communication between baseband CPU and large CPU, communication between baseband CPU and RF transceiver

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Failure of these operating conditions can result in no baseband failure

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This is the baseband circuit of Huawei's independent baseband

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That's all for this lesson