Semiconductor Memory Column Address Selective Delay Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor memory devices face challenges in ensuring a sufficient timing margin between the column select signal and the column address signal, particularly during write operations, especially under varying PVT conditions, which can lead to increased address access time and potential delays in data transfer.
Innovation Solution
A semiconductor memory device incorporating a discrimination signal generating circuit and a selective delay circuit that adjusts the delay value of the column address signal based on the operation type (write or read), ensuring a sufficient timing margin by increasing the delay during write operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the delay time of the column select signal is increased to improve address access time during write operations, then the timing margin between column address and column select signals is improved, but the address access time increases
Solution Approach 1:
The delay circuit selectively applies different delay amounts to the column address signal based on the operation type (read or write). During write operations, a first delay amount is applied to ensure proper timing margin, while during read operations, a second delay amount (different from the first) is applied. This dynamic adjustment of delay parameters based on operational context resolves the contradiction by optimizing timing margin only when necessary.
Solution Approach 2:
The invention changes the delay parameter of the column address signal based on the operation type. A delay control circuit generates different delay control signals for read and write operations, causing the delay circuit to apply different delay amounts. This parameter change allows the system to maintain sufficient timing margin during write operations while minimizing address access time during read operations.
2Speed
If the column select signal is activated earlier to reduce address access time, then speed is improved, but the timing margin between column address and column select signals becomes insufficient
Solution Approach 1:
The delay circuit dynamically adjusts the delay amount applied to the column address signal based on the operation type. During read operations, a smaller delay amount is applied to enable faster address access, while during write operations, a larger delay amount is applied to ensure sufficient timing margin. This dynamic behavior allows the system to optimize for speed when timing margin is less critical.
Solution Approach 2:
The delay control circuit generates different delay control signals depending on whether the operation is a read or write operation. This causes the delay circuit to change the delay parameter of the column address signal, enabling the system to achieve faster address access during read operations while maintaining adequate timing margin during write operations.
3Reliability
If a fixed delay is applied to the column address signal, then timing margin is ensured under all conditions, but address access time increases for read operations
Solution Approach 1:
Rather than applying a fixed delay to the column address signal, the invention uses a delay circuit that dynamically adjusts the delay amount based on the operation type. During write operations, a larger delay is applied to ensure timing margin, while during read operations, a smaller delay is applied to maintain high data transfer efficiency. This dynamic adjustment resolves the contradiction between reliability and productivity.
Solution Approach 2:
The delay control circuit changes the delay parameter of the column address signal based on the operation type (read or write). This parameter change allows the system to apply sufficient delay during write operations to ensure timing margin while minimizing delay during read operations to maintain high productivity and data transfer efficiency.
Data Source
AI summary
A semiconductor memory device can ensure a sufficient margin between a column select signal and a column address signal when a delay time of the column select signal is increased to improve an address access time during a write operation. The semiconductor memory device includes a discrimination signal generating circuit configured to generate a discrimination signal activated in a write operation of the device, and a selective delay circuit configured to selectively delay a column address in response to the discrimination signal.