Die-to-Die Interposer Links With Simultaneous Bidirectional Traces
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Solution Overview
Problem
Existing die-to-die communication systems are limited by the number of conductive traces due to surface area constraints, which restricts bandwidth and increases complexity, necessitating a solution that reduces trace count while maintaining or enhancing bandwidth.
Innovation Solution
Implementing simultaneous bi-directional (SBD) data lanes using a single conductive trace with paired transceivers for each lane, employing source-synchronous clocking and error correction to manage interference and fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single conductive trace is used for bidirectional communication, then the number of traces is reduced by half, but signal interference and fluctuations increase
Solution Approach 1:
The patent combines two unidirectional communication channels into a single bidirectional conductive trace. Transceivers on opposite dies simultaneously transmit and receive signals over the same physical trace, effectively merging two separate communication paths into one shared medium. This reduces the total trace count by half while maintaining full duplex communication capability.
Solution Approach 2:
The patent implements feedback mechanisms through error correction codes and signal conditioning circuits that detect and compensate for interference and fluctuations in real-time. The system continuously monitors signal quality and adjusts transmission parameters to maintain reliable communication despite the shared medium's inherent interference.
2Productivity
If simultaneous bi-directional communication is implemented on a single trace, then bandwidth is doubled for the same trace count, but device complexity increases due to paired transceivers and error correction
Solution Approach 1:
The patent makes each conductive trace universal by enabling it to carry both transmit and receive signals simultaneously. Each trace serves multiple functions (bidirectional data transmission, clock signaling, and error correction) that would traditionally require separate dedicated traces, thereby doubling the effective bandwidth capacity without increasing the physical trace count.
Solution Approach 2:
The patent introduces intermediary error correction codes and signal conditioning circuits that mediate between the transmitted signals and the received signals. These intermediaries detect, correct, and compensate for signal degradation, allowing reliable high-speed communication over the shared trace despite the increased complexity of the transceiver interfaces.
3Area of stationary object
If the number of conductive traces is reduced, then surface area constraints are relieved, but communication reliability decreases due to interference
Solution Approach 1:
By merging two separate unidirectional traces into one bidirectional trace, the patent reduces the total trace count and frees up valuable die surface area. This consolidation maintains communication reliability through simultaneous full-duplex operation and integrated error correction, achieving both space efficiency and reliable communication.
Data Source
AI summary
A first device includes a transceiver to communicate with a second device over an interposer, the interposer comprising a plurality of conductive traces between the first device and the second device. The first device also includes control logic, coupled to the transceiver associated with the first device, configured to send first data to the second device over a conductive trace of the plurality of conductive traces, simultaneously receive second data from the second device over the conductive trace, and extract the second data from a combined signal comprising the first data and the second data.