RF SerDes Multi-Bus Replication for Long-Trace Chip Interconnects
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Solution Overview
Problem
Existing chip-to-chip interconnects face challenges in supporting complex multi-bus replication needed in heterogeneous high-performance computing environments, leading to increased overhead, bit error rates, and performance degradation due to long traces on motherboards, while lacking real-time bus replication and data integrity on every cycle.
Innovation Solution
Utilizing RF SerDes technology to construct a multi-bus replicator that consolidates all internal buses from each chip into a unified bus, enabling low-latency, high-bandwidth, and low-power chip-to-chip interconnects over extended traces without advanced packaging, supporting full-duplex concurrent bus transfer and per-cycle data protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If advanced packaging techniques are used for die-to-die interconnect, then signal transmission quality is improved, but manufacturing cost and design complexity increase
Solution Approach 1:
The patent replaces mechanical/electrical signal transmission through advanced packaging with electromagnetic RF SerDes transmission. The multi-bus replicator uses RF SerDes components to serialize and transmit bus signals over long traces on conventional motherboards, substituting the need for advanced packaging techniques while maintaining signal integrity through per-cycle data protection and unified clock distribution.
2Adaptability or versatility
If transaction-based interconnect protocols are used, then compatibility with existing systems is improved, but bandwidth and latency performance deteriorate
Solution Approach 1:
The patent extracts and eliminates the transaction protocol layer from the interconnect system. By using RF SerDes for direct cycle-by-cycle bus signal transmission without transaction-based protocols, the system removes overhead from protocol layers, encoding-decoding processes, and clock-data recovery, achieving full-duplex concurrent bus transfer capability and real-time multi-bus replication while maintaining compatibility through standard RF SerDes interfaces.
3Reliability
If data protection is applied on every bus cycle, then data integrity is improved, but processing overhead increases
Solution Approach 1:
The patent applies preliminary action by encoding data protection information (such as parity or error correction codes) directly into the serialized data stream before transmission through the RF SerDes. This per-cycle data protection is integrated into the bus replication process itself, allowing error detection and correction to occur automatically during transmission without requiring additional processing overhead after data reception.
Data Source
AI summary
Multiple examples are disclosed of a multi-bus replicator using RF SerDes components for a chip-to-chip interconnect. In one example, a multi-bus replicator comprises an initiator write bus replication unit to receive write commands and write data from a plurality of write buses and to transmit the write commands and the write data using one or more RF SerDes transmitters; and a target write bus replication unit to receive the write commands and the write data from the RF SerDes transmitters and to provide the write commands and the write data on a plurality of write buses.