Memory Array PPR Logic for Conflicting Repair Mode Signals
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Solution Overview
Problem
The existing methods for post package repair in memory arrays, such as soft post package repair (sPPR) and hard post package repair (hPPR), can cause errors when both commands are received simultaneously, leading to incorrect execution of repair operations.
Innovation Solution
A post package repair method and device that utilize two logic circuits to receive and process signals for different PPR modes, generating valid signals based on the received signals, ensuring that only one mode is executed at a time to prevent errors, by using a mode transfer signal to determine which valid signal contains valid information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both sPPR and hPPR commands are received simultaneously, then the system can handle multiple repair requests, but execution errors occur due to conflicting repair operations
Solution Approach 1:
The patent applies preliminary action by generating valid signals in advance based on the mode transfer signal before executing repair operations. The logic circuits pre-determine which PPR command (sPPR or hPPR) should be executed by creating valid signals that indicate the authoritative command, preventing execution errors before they occur. This is evident in the embodiment where valid signals are generated based on the mode transfer signal prior to command execution.
2Productivity
If the system executes repair operations quickly, then productivity is improved, but error prevention mechanisms may be bypassed
Solution Approach 1:
The patent uses valid signals as intermediaries between the PPR command inputs and the execution logic. These valid signals act as mediators that resolve conflicts between simultaneous sPPR and hPPR commands without slowing down the execution process. The execution logic simply follows the valid signal indication, maintaining high speed while ensuring correctness. This intermediary mechanism is clearly shown in the embodiment where valid signals bridge the command reception and execution stages.
3Reliability
If the system adds complex logic to prevent simultaneous execution errors, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the PPR command execution into distinct functional blocks: first logic circuit for receiving PPR signals, second logic circuit for generating valid signals, and execution logic for carrying out repairs. This segmentation organizes the complexity into manageable, independent modules that can be implemented using standard logic circuit components. Each segment has a clear, simple function, making the overall system easier to implement and verify despite handling multiple repair modes.
Data Source
AI summary
A post package repair (PPR) method is disclosed. The PPR method includes the following operations: receiving a first PPR signal and a second PPR signal, in which the first PPR signal corresponds to a first PPR mode, and the second PPR signal corresponds to a second PPR mode; generating a first valid signal and a second valid signal according to the first PPR signal and the second PPR signal, in which only one of the first valid signal and the second valid signal comprises a valid information when both of the first PPR signal and the second PPR signal comprise an enabled information; in which when the first valid signal comprises the valid information, the first PPR mode is executed, and when the second valid signal comprises the valid information, the second PPR mode is executed.