Memory Impedance Calibration Using Environment-Based Initial Values
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Solution Overview
Problem
Current ZQ calibration in Dynamic Random Access Memory (DRAM) consumes excessive power and system time due to fixed initial resistance values that need to be adjusted, impacting memory performance.
Innovation Solution
An impedance calibration circuit comprising a parameter module for environment detection, an initial value generation module to produce environment-specific initial calibration values, and a calibration module to perform impedance calibration using these values, reducing power consumption and calibration time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed initial resistance values are used for ZQ calibration, then the calibration process is simple, but power consumption and calibration time increase excessively
Solution Approach 1:
The patent applies preliminary action by detecting environment parameters (temperature, voltage, frequency) before the ZQ calibration process and using these parameters to pre-calculate initial calibration values. This preliminary detection and calculation phase allows the main calibration process to start from a closer initial point, significantly reducing the time and power required for calibration while maintaining accuracy.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the initial calibration values based on detected environment parameters. Instead of using fixed initial values, the system modifies the initial calibration parameters according to temperature, voltage, and frequency conditions, enabling faster convergence during calibration and reducing overall calibration time and power consumption.
2Device complexity
If fixed initial resistance values are used for ZQ calibration, then the circuit design is simple, but power consumption increases
Solution Approach 1:
The patent reduces power consumption by performing environment parameter detection and initial value calculation before the main calibration process. This preliminary action ensures that the calibration starts from an optimized initial point, reducing the number of iteration cycles needed and thereby lowering overall power consumption during calibration operations.
Solution Approach 2:
The system dynamically changes initial calibration parameters based on detected environment conditions (temperature, voltage, frequency). By adapting initial values to current environmental parameters, the calibration process requires fewer adjustment steps, directly reducing power consumption while maintaining calibration accuracy.
3Loss of time
If environment-specific initial calibration values are used, then calibration time is reduced, but device complexity increases
Solution Approach 1:
The patent introduces environment parameter detection modules and initial value calculation logic as preliminary steps before calibration. These additional components enable the system to quickly determine appropriate initial values based on temperature, voltage, and frequency conditions, significantly reducing calibration time while adding only moderate complexity through modular detection and calculation units.
Data Source
AI summary
An impedance calibration circuit, an impedance calibration method, and a memory are provided. The impedance calibration circuit includes a parameter module, an initial value generation module, and a calibration module. The parameter module is configured to perform environment detection processing and output an environment parameter signal; the initial value generation module is configured to receive the environment parameter signal, and output an initial calibration value based on the environment parameter signal when the calibration instruction signal is received; and the calibration module is configured to receive the initial calibration value, and perform impedance calibration processing based on the initial calibration value when the calibration instruction signal is received.