CAS Latency Setting Circuit for Dynamic Memory Testing
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Solution Overview
Problem
Conventional semiconductor memory apparatuses are inefficient in testing various CAS latency values, as they require manual changes to the mode register set during each test, making it cumbersome to verify proper operation across different system environments.
Innovation Solution
A CAS latency setting circuit that allows for dynamically changing the initially-set CAS latency value in response to control signal pulses during a test mode, enabling selective output of either normal or test CAS latency values based on the current mode, using a test CAS latency setting unit with a counter section and setting signal generation to adjust the latency values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual changes to the mode register set are made during each test, then various CAS latency values can be tested, but testing efficiency deteriorates due to the cumbersome process
Solution Approach 1:
The patent implements a test mode that dynamically changes the CAS latency value in response to control signal pulses, transforming the static CAS latency setting into a dynamic one. This allows the semiconductor memory apparatus to automatically cycle through different CAS latency values during testing, eliminating the need for manual mode register changes and significantly improving testing efficiency while maintaining the ability to test various latency values
2Adaptability or versatility
If the CAS latency value is changed during testing, then verification under different conditions is enabled, but the initial settings are altered
Solution Approach 1:
The patent segments the CAS latency setting function into two distinct modes: a normal mode that preserves the initial CAS latency setting for regular operation, and a test mode that temporarily enables dynamic CAS latency changes for verification purposes. This segmentation allows the system to maintain stable initial settings while enabling flexible testing when needed, as the test mode changes are confined to a specific operational context and do not permanently alter the default configuration
Data Source
AI summary
A semiconductor memory apparatus includes a CAS latency setting circuit configured to change an initially-set CAS latency value in response to control signal pulses which are sequentially applied, during a test mode without changing settings of a mode register set during each test.