Test Mode Initialization Circuit Layout for Semiconductor Die Area Reduction
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Solution Overview
Problem
Conventional semiconductor die circuits require significant surface area for test-mode signal routing due to the placement of test-mode blocks far from address blocks, leading to inefficient use of space and increased die size.
Innovation Solution
A new circuit layout that includes local test-mode blocks with latches and decoders positioned near address blocks, utilizing a multiplexer to route test-mode signals in series on a single bus line, reducing the need for extensive signal routing and minimizing surface area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If test-mode blocks are positioned far from address blocks to consolidate test-mode signals, then signal routing is simplified, but die surface area increases significantly
Solution Approach 1:
The patent divides the centralized test-mode block into distributed local test-mode blocks positioned near each address block. Each local block independently handles test-mode signal latching and decoding, eliminating the need for long-distance signal routing across the die while maintaining functional separation of test operations from normal address operations.
Solution Approach 2:
The patent transitions from a single centralized test-mode block to multiple distributed local blocks across the die surface. This spatial distribution transforms the routing problem from requiring long horizontal/vertical traces to using local short-distance connections, effectively solving the contradiction by changing the dimensional arrangement of test-mode functionality.
2Adaptability or versatility
If test-mode signals are routed over long distances across the die, then all test-mode signals can be centralized, but surface area is wasted
Solution Approach 1:
The patent segments the monolithic test-mode block into multiple smaller local test-mode blocks distributed throughout the die. Each local block serves its nearby address block, eliminating the need for long-distance signal routing while maintaining the ability to distribute test-mode signals flexibly across different regions of the die.
Solution Approach 2:
Each local test-mode block is self-sufficient, containing its own latching and decoding circuitry to handle test-mode signals locally. This self-service approach eliminates the need for centralized signal distribution infrastructure, allowing each region to independently manage its test-mode operations without requiring extensive interconnect routing.
3Device complexity
If a centralized test-mode block is used to manage all test signals, then signal generation is simplified, but the block must be positioned far from address blocks requiring significant routing area
Solution Approach 1:
The patent breaks down the centralized test-mode block into multiple distributed local test-mode blocks. Each local block contains simplified latching and decoding circuitry, distributing the functional complexity across the die rather than concentrating it in one location, thereby reducing the routing area required while maintaining manageable structural complexity.
Solution Approach 2:
The patent redistributes test-mode functionality from a single point (centralized block) to multiple points (distributed local blocks) across the die surface. This dimensional transformation converts the routing requirement from long-distance point-to-point connections to short-distance local connections, dramatically reducing the area consumed by signal routing.
Data Source
AI summary
A die includes: a plurality of efuses, for respectively generating a plurality of test-mode signals; a control unit, coupled to a first control signal, for generating a plurality of control bits; a multiplexer, coupled to the plurality of test-mode signals and the control unit, for muxing the plurality of test-mode signals in series in response to the plurality of control bits; at least an address block, for receiving a specific test-mode signal; and at least a local test-mode block coupled to the address block. The local test-mode block comprises: a latch, for latching a specific test-mode signal and releasing the latched test-mode signal to the address block in response to a second control signal; a first decoder, for releasing the specific test-mode signal to the latch in response to the plurality of control bits; and a second decoder, for generating the second control signal to the latch.