Transmit/Receive Unit Dynamic Termination for Signal Integrity
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Solution Overview
Problem
As the fan-out/fan-in of parallel test circuits increases, maintaining signal integrity and DUT isolation becomes difficult, and there is a need to balance high fan-out/fan-in requirements with the modularity of lower order circuits, especially in applications where increased fan-out/fan-in is not always necessary.
Innovation Solution
The method involves using a test system coupled to multiple parallel test circuits, each with transmit/receive units that can be dynamically configured as transmitting or non-transmitting units, actively terminating the transmission line network to ensure signal integrity and directionality, and adjusting signal delay between units to maintain signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan-out/fan-in of parallel test circuits is increased, then the capability to test more DUT I/O blocks simultaneously is improved, but signal integrity and DUT isolation become difficult to maintain
Solution Approach 1:
The patent divides the test circuit into multiple independent transmit/receive units, each capable of operating independently. Each unit has its own driver, receiver, and termination resistor, allowing the system to maintain signal integrity even as the overall fan-out/fan-in capability increases by distributing the signal load across multiple segmented units rather than a single monolithic circuit.
Solution Approach 2:
The patent implements dynamic configuration where transmit/receive units can be selectively activated or deactivated based on testing requirements. The control system enables or disables specific units, allowing the circuit to adapt its effective fan-out/fan-in ratio dynamically. This dynamic capability allows the system to maintain signal integrity by activating only the necessary units for a given test scenario, rather than all units being permanently active.
2Productivity
If the fan-out/fan-in of parallel test circuits is increased, then the capability to test more DUT I/O blocks simultaneously is improved, but DUT isolation becomes difficult to maintain
Solution Approach 1:
The patent segments the test circuit into independent transmit/receive units, each with dedicated drivers and receivers. This segmentation ensures that signal paths to different DUT I/O blocks remain electrically isolated from each other, maintaining DUT isolation even as the overall fan-out/fan-in capability increases. Each unit operates independently without interfering with other units' signal paths.
3Productivity
If a single parallel test circuit is used with high fan-out/fan-in, then the modularity of lower order circuits is reduced, but the capability to handle high fan-out requirements is improved
Solution Approach 1:
The patent implements a modular architecture where the test circuit is divided into multiple identical or similar transmit/receive units that can be independently configured and controlled. This segmentation maintains modularity by allowing each unit to be designed and tested separately, then combined to achieve high fan-out/fan-in capability. The control system manages these modular units to provide the necessary functionality without requiring a completely custom high-order circuit design.
Data Source
AI summary
In one embodiment, apparatus for transmitting and receiving data includes a transmission line network having at least three input/output terminals; at least three transmit/receive units, respectively coupled to the at least three input/output terminals; and a control system. The control system is configured to, depending on a desired direction of data flow over the transmission line network, i) dynamically place each of the transmit/receive units in a transmit mode or a receive mode, and ii) dynamically enable and disable an active termination of each transmit/receive unit. Methods for using this and other related apparatus to transmit and receive data over a transmission line network are also disclosed.