Memory I/O Buffer Temperature Compensation
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Solution Overview
Problem
Conventional memory devices, such as synchronous SRAMs, lack a mechanism to control the data valid window (DVW) effectively across varying temperatures, leading to unreliable data access due to temperature-induced changes in propagation speed, which complicates synchronization and can result in impractically small DVW at higher operating speeds.
Innovation Solution
A temperature-compensated circuit and multi-stage input-output (I/O) buffer are used to dynamically adjust the number of delay elements in the data path based on sampled temperature, ensuring a substantially constant DVW by enabling or disabling delay elements in response to temperature variations, thereby compensating for changes in transistor speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If memory devices operate at higher clock speeds, then data access speed is improved, but data valid window becomes insufficient and unreliable
Solution Approach 1:
The patent implements dynamic adjustment of the data valid window by enabling or disabling delay elements in the I/O buffer based on temperature conditions. The system transitions from a static fixed window to a dynamic adjustable window that adapts to changing operating conditions, allowing the valid window to expand or contract as needed to maintain reliability at high speeds.
Solution Approach 2:
The patent changes the parameter of delay element configuration in response to temperature variations. By monitoring temperature and adjusting the number of active delay elements, the system modifies the timing characteristics of the data valid window to compensate for temperature-induced speed changes, thereby maintaining reliable data access across different thermal conditions.
2Device complexity
If temperature variations are not compensated, then device complexity remains low, but data valid window becomes adversely affected
Solution Approach 1:
The patent segments the I/O buffer into multiple stages with individual delay elements that can be independently controlled. This segmentation allows selective activation of delay elements based on temperature conditions, providing fine-grained control over the data valid window timing without requiring a complete redesign of the entire buffer system.
Solution Approach 2:
The patent incorporates temperature monitoring and uses this feedback to adjust the configuration of delay elements in the I/O buffer. The system continuously monitors temperature conditions and responds by enabling or disabling specific delay elements, creating a closed-loop control mechanism that maintains data valid window stability despite temperature variations.
3Reliability
If delay elements are added to extend data valid window, then data access reliability is improved, but data access time increases
Solution Approach 1:
The patent dynamically adjusts the number of active delay elements based on temperature conditions and data access requirements. Rather than always using maximum delay elements to ensure reliability, the system activates only the necessary number of delay elements for current operating conditions, optimizing the balance between reliability and access time in real-time.
Solution Approach 2:
The patent applies partial action by using only the necessary number of delay elements rather than always activating all available delay elements. This allows the system to provide sufficient reliability for current operating conditions without unnecessarily adding excessive delay, thereby optimizing the trade-off between reliability and access time.
Data Source
AI summary
A memory architecture and a method of operating the same can provide a substantially constant data valid window (DVW) irrespective of a temperature for the memory device. Generally, a memory device can receive an access request, determine a temperature of the memory device, and switch a number of delay elements in an output buffer in response to the temperature of the memory device. In one embodiment, a memory device can have a multi-stage input-output (I/O) buffer and an automatic temperature compensated circuit that samples a temperature of the memory and then switches a number of delay elements in the I/O buffer into a data path between the memory and the output to provide a substantially constant DVW over changes in temperature.