Every generation of processors is different, so this knowledge is completely useless to ordinary users (except enthusiasts). Even chip-level repairs only need to check whether the signal is normal according to the specific model of motherboard or CPU. No need to study, so there will be less articles.
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When we press the start button, the first thing to start is the power supply (because if Without power supply, all accessories on the motherboard will not work). However, in order to ensure safe use, the power supply part has adopted a series of safety protection measures; therefore, there will be a delay between the start-up and stabilization of the switching power supply. After waiting for each group of voltages to stabilize, each part of the power supply will output a detection signal. , when this signal is high level, it means that the voltage of this part is normal. These parts include the input voltage and the output voltage of each group. The result of the sum of these signals is a POWER GOOD signal (also called POWER OK or PWR OK signal); if the motherboard cannot receive this signal, the clock chip will continue to send reset (RESET) signals to the CPU (similar to when we press the RESET key Quite), the CPU will not work. When the CPU receives the normal POWER GOOD signal, will the motherboard and CPU start up? In fact, at this time, the motherboard also needs to send the VID0-VID3 signals provided by the CPU to the corresponding ports of the power management module according to the defined combination of the VID0-VID3 pins of the CPU; if the motherboard BIOS has the function of setting the CPU voltage, The motherboard will generate a new VID signal based on the corresponding relationship between the set voltage and VID and send it to the power management module chip. The power management module will convert it into a reference voltage through the DAC voltage according to the setting, and then conduct it in turn through the field effect transistor. On and off, the energy is sent to the CPU through the inductor coil, and finally the output voltage is used through the adjustment circuit to be equivalent to the set voltage value.
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Part of the CPU pin is connected to the VID signal pin of the PWM controller chip. When the motherboard starts, the CPU core voltage will be set The VID signal is sent to the VID pin of the PWM controller chip. The DAC digital-to-analog conversion and setting circuit will compile and convert the VID digital signal of the initial voltage sent by the CPU and send out the reference voltage used when setting the voltage. The pulse width modulation signal output circuit adjusts the duty cycle of the pulse signal according to this reference voltage value, allowing the MOSFET tubes to turn on in turn to generate the rated CPU core voltage. The sampling circuit retrieves the voltage feedback signal from the output end and compares it with the reference voltage. If there is a deviation, it adjusts the time interval for the MOSFET tubes to turn on by controlling the width of the pulse signal to obtain the corrected CPU core voltage. Finally, the function of the protection circuit is to monitor the output and, if the voltage is too high or too low, suspend the CPU to ensure its safety. If we cut off the initial VID signal sent from the CPU to the PWM controller chip, set the core voltage we need through the motherboard hard jumper or BIOS, and then convert it into the corresponding VID signal before sending it to the DAC in the PWM controller chip Digital-to-analog conversion and setting circuit, at this time the motherboard will output the corresponding CPU core voltage according to the user's settings. Such a motherboard has the function of accurately adjusting the CPU core voltage.
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Answer: Water and Fire Soldier - Magic Apprentice Level 5-18 20:43
Training profession, agreement Can I request to change the liquidated damages?
Ordinary employees have not been trained (they have not been before and they will not be in the future). Nor is it a job involving confidential information.
However, there is an item in the labor contract that “involves confidential information and if you leave before the expiration of the term, you will be compensated 1,000 yuan; if you have received training and leave before the expiration of the term, you will be compensated with 1,000 yuan”
Answer: I am an idiot - Magic Apprentice Level 5-19 23:10
czxt.bbs.ful.cn
Operating System Forum
This is a good place, take a look.
Answer: qdinglin - Probation Level 5-22 19:13