On-Die Termination Timing for Faster Memory Signal Reception
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Solution Overview
Problem
Existing signal transmitting and receiving apparatuses and memory devices face performance degradation due to the simultaneous enablement and disablement of on-die termination circuits, which leads to preamble and postamble times that hinder efficient signal transmission and reception, especially in mobile electronic devices with increasing operating system sizes.
Innovation Solution
The implementation of independently controlled on-die termination circuits for signal lines and read data strobe pins, allowing for differential enable and disable timing to prevent performance degradation by enabling the first on-die termination circuit before the second, thereby allowing signal transmission and reception without waiting for the second circuit to be enabled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If on-die termination circuits are simultaneously enabled for signal lines and read data strobe pins, then signal integrity is improved, but preamble time increases reducing transmission efficiency
Solution Approach 1:
The termination control is segmented into separate control signals for signal lines (ODTSEL_S) and read data strobe pins (ODTSEL_RD). This allows independent enablement of termination circuits for different signal types, enabling the signal line termination to be activated before the read data strobe termination, thus reducing preamble time while maintaining signal integrity for both signal types.
Solution Approach 2:
The termination circuit for signal lines is enabled in advance (preliminarily) before the termination circuit for read data strobe pins. This preliminary action ensures that the signal line is ready to receive signals immediately when data transfer begins, eliminating the need to wait for the read data strobe termination to be enabled, thereby reducing preamble time.
2Device complexity
If on-die termination circuits are simultaneously disabled, then device complexity is reduced, but postamble time increases reducing reception efficiency
Solution Approach 1:
The disable control is segmented into separate control signals for signal lines (ODTSEL_S) and read data strobe pins (ODTSEL_RD). This segmentation enables the signal line termination to be disabled before the read data strobe termination, allowing the device to reduce complexity through independent control while minimizing postamble time by maintaining necessary termination longer for the read data strobe signal.
Solution Approach 2:
The termination control system is made dynamic by allowing different enable and disable timing for different signal types. The control circuit can adaptively adjust the termination state based on the specific signal being transmitted or received, enabling flexible timing control that reduces postamble time while maintaining signal integrity.
3Productivity
If termination circuits are enabled later, then productivity is improved, but signal integrity deteriorates due to reflection
Solution Approach 1:
The termination circuit for signal lines is enabled preliminarily before data transmission begins, ensuring that the signal line is properly terminated and ready to receive signals without reflection. This preliminary enablement maintains signal integrity while allowing the system to proceed with data transfer immediately, thus maintaining high productivity.
Solution Approach 2:
By segmenting the termination control into separate controls for different signal types, the system can enable termination for signal lines at the optimal time for high-speed data transmission, while independently managing the termination for read data strobe pins. This segmentation allows productivity to be maximized for data transmission while maintaining signal integrity through appropriate termination timing.
Data Source
AI summary
A signal transmitting and receiving apparatus including: a first on-die termination circuit connected to a first pin through which a first signal is transmitted or received and, when enabled, the first on-die termination circuit is configured to provide a first termination resistance to a signal line connected to the first pin; a second on-die termination circuit connected to a second pin through which a second signal is transmitted or received and, when enabled, the second on-die termination circuit is configured to provide a second termination resistance to a signal line connected to the second pin; and an on-die termination control circuit configured to independently control an enable time and a disable time of each of the first on-die termination circuit and the second on-die termination circuit.