Command Address Control Circuit for Reliable Multi-Cycle Signaling
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Solution Overview
Problem
The reduction in the number of pins or pads for transmitting and receiving command address signals in semiconductor systems poses challenges in ensuring reliable and error-free communication, particularly in integrated circuits where command address signals are transmitted and received over a limited number of pins or pads for multiple clock cycles.
Innovation Solution
A command address control circuit is introduced, comprising a command decoding circuit, an error decision circuit, and a shifting circuit, which detects the type and integrity of command address signals using reference clock signals, generates error detection signals, and shifts the signals accordingly to ensure accurate transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of pins or pads for transmitting and receiving command address signals is reduced, then the device complexity is reduced, but the reliability of command address signal transmission deteriorates
Solution Approach 1:
The patent applies preliminary action by implementing error detection and correction mechanisms before the command address signal transmission is complete. The receiving device performs parity checking and verifies signal integrity in advance, allowing the system to detect and correct errors without requiring additional physical pins or pads, thus maintaining reliability while reducing pin count
Solution Approach 2:
The patent implements feedback mechanisms where the receiving device sends back acknowledgment signals and error indicators to the transmitting device. This feedback loop allows for real-time verification of signal integrity and enables retransmission of corrupted signals, maintaining reliable communication with fewer pins by using time-domain redundancy instead of spatial redundancy
2Adaptability or versatility
If command address signals are transmitted through limited pins or pads for multiple clock cycles, then the adaptability is improved, but the measurement precision of command address signal integrity deteriorates
Solution Approach 1:
The patent performs preliminary error detection actions during the transmission process itself. Parity bits are calculated and transmitted alongside the command address signals, allowing immediate detection of integrity issues without requiring post-transmission analysis, thus maintaining measurement precision while enabling multi-cycle transmission through limited pins
Solution Approach 2:
The patent dynamically adjusts the transmission protocol based on detected errors. When errors are detected in command address signals transmitted over multiple clock cycles, the system can retransmit affected signals or adjust timing parameters, allowing flexible adaptation to maintain signal integrity precision despite the constraints of limited pins and multi-cycle transmission
Data Source
AI summary
A command address control circuit includes a command decoding circuit, an error decision circuit, and a shifting circuit. The command decoding circuit detects a type of command address signal set in synchronization with a reference clock signal. The error decision circuit detects whether an error is present in the command address signal set, and generates a block signal based on the type of command address signal set and the results of the detection of an error. The shifting circuit outputs the command address signal set as an internal command address signal set based on the reference clock signal and the block signal.