VID Reference Voltage Circuit Adjustable Boot Voltage
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Solution Overview
Problem
Conventional boot voltage generation in computer systems is fixed during startup, limiting user control over the initial voltage value necessary for specific procedures, as the central processing unit has not transmitted the VID signal to the PWMVID reference voltage generator.
Innovation Solution
A VID reference voltage generation circuit with a preset voltage providing unit, a switch, and a VID input signal detection unit, where the detection unit generates a control signal to activate the switch, allowing the preset voltage providing unit to output an adjustable preset voltage when no VID signal is detected, utilizing a resistor-capacitor network to adjust the voltage division node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional PWMVID reference voltage generator is used, then the output voltage can be adjusted during normal operation via VID signal, but the boot voltage remains fixed and cannot be adjusted
Solution Approach 1:
The reference voltage generation circuit is designed to perform multiple functions: during normal operation it responds to VID signals for voltage adjustment, and during boot-up it generates an adjustable preset voltage when no VID signal is present. This multi-functionality allows the same circuit to handle both boot voltage generation and normal operation voltage regulation without requiring separate circuits.
Solution Approach 2:
The circuit is configured to detect the absence of a VID signal and automatically switch to preset voltage mode during boot-up before the CPU transmits any VID signal. This preliminary action ensures that the boot voltage is immediately available and adjustable without waiting for external control signals.
2Ease of operation
If the boot voltage is fixed by reference voltage and resistors, then the circuit structure remains simple, but the user cannot control the voltage value for specific procedures
Solution Approach 1:
The circuit transitions from a static fixed voltage configuration to a dynamic adjustable voltage system. During boot-up, the circuit can switch between different voltage division ratios using controllable switches, allowing the boot voltage to be dynamically adjusted based on user requirements while maintaining a relatively simple overall structure.
Solution Approach 2:
A detection unit serves as an intermediary between the absence of VID signal and the activation of preset voltage mode. This intermediary component automatically detects when no VID signal is present and triggers the appropriate voltage generation mode, providing user-friendly automatic control without complex manual intervention.
3Reliability
If the output voltage is determined by reference voltage and resistors during boot-up, then the circuit operates reliably, but specific procedures cannot be executed when boot voltage does not match required voltage value
Solution Approach 1:
The circuit changes the voltage output parameter during boot-up by switching between different resistor network configurations. When no VID signal is detected, the circuit activates a preset voltage mode that provides a specific voltage value (e.g., 0.5V to 1.5V) to ensure reliable execution of boot procedures that require specific voltage levels.
Data Source
AI summary
A voltage identification definition (VID) reference voltage generation circuit and a boot voltage generating method thereof are provided. In the boot voltage generating method, a VID reference voltage generation circuit is provided. The VID reference voltage generation circuit includes a preset voltage providing unit, a switch and a VID input signal detection unit. When the VID input signal detection unit detects no input of a VID signal, a control signal is generated to control the switch, such that the preset voltage providing unit provides an adjustable preset voltage.