Memory Termination Circuit for ODT Timing and Noise Control
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Solution Overview
Problem
In semiconductor integrated circuits, power-supply noise on bidirectional signal lines disrupts accurate data transmission and reception due to sudden fluctuations in power supply voltage, particularly when the receiver circuit switches off the ODT function, affecting subsequent data transmission.
Innovation Solution
A semiconductor integrated circuit with a termination circuit comprising a resistor and a switch, controlled by a control circuit to manage the ODT function, ensuring it remains on for a predetermined period after data reception to mitigate power-supply noise, thereby enabling accurate data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the receiver circuit switches off the ODT function after receiving data, then power consumption is reduced, but power-supply noise occurs on the bidirectional signal line due to sudden voltage fluctuation
Solution Approach 1:
The control circuit predicts the timing of subsequent data reception based on a predetermined period before the actual data arrival. By switching on the ODT function in advance of the predicted reception timing, the system prepares the signal line impedance in advance, preventing power-supply noise when the actual data reception occurs. This preliminary action ensures the ODT function is already active before noise-generating events occur.
Solution Approach 2:
The ODT function switching is made dynamic and adaptive rather than static. The control circuit continuously monitors reception timing and dynamically adjusts the ODT switching schedule based on predicted data arrival times. This dynamic control allows the system to optimize the balance between power consumption and noise reduction by switching the ODT function on only when and where needed, rather than keeping it continuously on or off.
2Reliability
If the ODT function is switched on continuously to reduce power-supply noise, then data transmission accuracy is improved, but power consumption increases
Solution Approach 1:
The control circuit predicts the timing of subsequent data reception based on a predetermined period before the actual data arrival. By switching on the ODT function in advance of the predicted reception timing, the system prepares the signal line impedance in advance, preventing power-supply noise when the actual data reception occurs. This preliminary action ensures the ODT function is already active before noise-generating events occur.
Solution Approach 2:
The ODT function is switched on and off periodically based on predicted data reception timing rather than continuously. The control circuit uses a predetermined period to anticipate when data will arrive and schedules ODT activation accordingly. This periodic switching maintains data transmission accuracy during critical reception windows while reducing power consumption during intervals when data transmission is not expected.
3Use of energy by moving object
If the receiver circuit switches off the ODT function to reduce power consumption, then power consumption is reduced, but subsequent data reception is influenced by power-supply noise
Solution Approach 1:
The control circuit predicts the timing of subsequent data reception based on a predetermined period before the actual data arrival. By switching on the ODT function in advance of the predicted reception timing, the system prepares the signal line impedance in advance, preventing power-supply noise when the actual data reception occurs. This preliminary action ensures the ODT function is already active before noise-generating events occur.
Solution Approach 2:
The control circuit uses feedback from reception timing information to adjust ODT switching decisions. By monitoring when data is actually received and using this information to predict future reception timing, the system creates a feedback loop that optimizes ODT control. This feedback mechanism ensures the ODT function is activated at the right times to protect data reception accuracy while minimizing unnecessary power consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces power-supply noise, ensuring accurate data transmission and reception by maintaining the ODT function on during data reception intervals, preventing noise interference and ensuring reliable data transfer.
Implementation Method 1
a first termination circuit that includes a first resistor and a first switch, the first resistor being provided between a first power supply terminal and the signal line, the first switch controlling a current flowing through the first resistor to be turned on and off
Implementation Method 2
a bidirectional signal line for bidirectionally transmitting data between the transmitter-receivers is equipped with a termination circuit which switches on an ODT function when receiving the data and switches off the ODT function when not receiving the data
Data Source
AI summary
Provided is a semiconductor integrated circuit according to an exemplary aspect of the present invention including first and second transmitter-receivers that execute transmission and reception of data through a signal line. The first transmitter-receiver includes a first termination circuit that includes a first resistor and a first switch, the first resistor being provided between a first power supply terminal and the signal line, the first switch controlling a current flowing through the first resistor to be turned on and off, and a control circuit that outputs a first control signal to the first termination circuit so that the first switch is turned on when the first transmitter-receiver receives data, the first switch is turned off when the first transmitter-receiver transmits the data, and the first switch is continuously on during a first predetermined period after receiving the data when the first transmitter-receiver further receives another data after receiving the data.