Implicit Precharge Signal Generation Circuit for Semiconductor Devices
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Solution Overview
Problem
Semiconductor devices face inefficiencies in performing successive active operations due to the need for separate precharge commands, which can lead to mis-operations and require additional input lines and pins, increasing costs and layout area.
Innovation Solution
Incorporating an implicit precharge signal generation circuit that generates a precharge signal in response to a flag signal from an external control signal, allowing for internal precharge operations between successive active commands without the need for a separate precharge command, thus reducing the requirement for additional input lines and pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate precharge commands are used between successive active operations, then precharge operations can be performed, but operation speed deteriorates and additional input lines and pins are required
Solution Approach 1:
The system performs precharge operations automatically through implicit precharge signal generation based on command detection, eliminating the need for separate precharge commands. The memory device self-manages the precharge timing by detecting successive active commands and generating internal precharge signals, thereby improving operation speed without sacrificing precharge reliability.
Solution Approach 2:
The system detects successive active commands in advance and generates implicit precharge signals before the next active operation begins. This preliminary precharge action ensures that bit lines are properly prepared for the next operation, maintaining reliability while enabling faster successive operations without requiring additional external precharge commands.
2Reliability
If separate precharge commands are used, then precharge operations can be performed, but device complexity increases due to additional input lines and pins
Solution Approach 1:
The existing command input lines and pins are made multi-functional by enabling them to convey both active commands and precharge command information. The system interprets the absence or specific pattern of precharge commands to trigger implicit precharge operations, allowing the same physical interface to support both operation types without requiring dedicated precharge input lines or pins.
Solution Approach 2:
The memory device automatically detects when precharge is needed by monitoring successive active commands and generates internal precharge signals without requiring external precharge commands. This self-service mechanism eliminates the need for additional input lines and pins while ensuring reliable precharge operations are performed at appropriate times.
Data Source
AI summary
A semiconductor device includes an information signal conversion circuit suitable for generating a flag signal from an external control signal in response to an information signal, and an implicit precharge signal generation circuit suitable for generating an implicit precharge signal for performing a precharge operation between successive active operations, in response to the flag signal.