Serial I/O Option Chain for DDR5 Interface Self-Testing
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Solution Overview
Problem
Current semiconductor design technologies face challenges in setting and testing options for I/O interface circuits of ultrahigh-speed memory devices like DDR5 SDRAM, particularly in achieving improved jitter, duty cycle, and reduced voltage fluctuations, which are difficult to implement due to the complexity and variability of 4-tap DFE technology, leading to increased chip size and testing costs.
Innovation Solution
A semiconductor device with a serial chain configuration that allows for setting and monitoring options for I/O interface characteristics without the need for separate test devices, using a serial input pad, interface circuits, and option setting circuits to configure a serial chain for high-speed operation and bit error rate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If simulation is used to evaluate options for parameters involved in the I/O interface circuit, then the options can be evaluated before real circuit implementation, but the simulated options are not only inaccurate but also require a long design period
Solution Approach 1:
The semiconductor device performs self-testing by using its own internal resources (serial chain, option setting circuits, interface circuits) to evaluate I/O interface options without requiring external test equipment. This self-service approach eliminates the need for lengthy external testing while providing accurate real-circuit performance data.
Solution Approach 2:
The testing function is extracted from the main operational function by utilizing the serial chain and option setting circuits that are already present in the device structure. These components are used dual-purpose: for normal operation configuration and for self-testing of I/O interface options, thereby avoiding additional external test equipment.
2Reliability
If all combinations of options are tested to ensure specification compliance, then complete verification is achieved, but the cost of testing is increased
Solution Approach 1:
The device performs self-verification by using its internal serial chain and option setting circuits to test I/O interface configurations. This eliminates the need for expensive external test equipment and reduces testing costs while maintaining comprehensive verification of specification compliance through automated internal testing.
Solution Approach 2:
The serial chain and option setting circuits serve multiple functions: they are used for both normal operational configuration of I/O interfaces and for comprehensive testing of all option combinations. This multi-functionality reduces the need for dedicated test equipment and lowers overall testing costs.
3Reliability
If a plurality of options are employed for parameters involved in an I/O interface circuit to meet specifications, then specification compliance is improved, but the chip size is increased
Solution Approach 1:
The serial chain and option setting circuits are designed to serve dual purposes: they configure I/O interface options during normal operation and simultaneously perform self-testing and verification. This multi-functionality eliminates the need for separate dedicated test structures, thereby reducing overall chip area while maintaining comprehensive option coverage for specification compliance.
Solution Approach 2:
The testing functionality is merged with the operational configuration structures (serial chain, option setting circuits). By combining these functions into a single integrated structure rather than having separate test hardware, the chip area is reduced while still enabling comprehensive testing of all I/O interface option combinations.
Data Source
AI summary
A semiconductor device includes a plurality of input/output (I/O) pads; a serial input pad; a serial output pad; a plurality of interface circuits respectively corresponding to the I/O pads; and a plurality of option setting circuits respectively corresponding to the interface circuits, suitable for setting options of the respective interface circuits, wherein the serial input pad, the interface circuits, the option setting circuits, and the serial output pad configure a serial chain.