Superconducting SIPO Converter Layout for Scalable Parallel Output
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Solution Overview
Problem
Conventional superconducting computer systems face inefficiencies in converting serial data streams to parallel data due to exponential growth of enable trees, leading to large and potentially unfeasible circuits with significant delay and resource inefficiencies.
Innovation Solution
A superconducting serial-to-parallel converter system utilizing a sequence of SIPO cells that counter-propagate serial data streams and enable pulses, employing Josephson transmission lines and logic AND gates to convert serial bits into parallel bits concurrently, with controlled delays to synchronize output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an enable tree is used to provide parallel pulses to all data bits simultaneously, then parallel data transmission is achieved, but the circuit size grows exponentially with the depth of the shift register
Solution Approach 1:
The patent divides the shift register into multiple segments or groups, where each group has its own enable signal. Instead of requiring a single enable tree to control all bits simultaneously, the system processes data in chunks, reducing the fanout requirement for each enable tree and preventing exponential growth in circuit size.
Solution Approach 2:
The patent introduces a new dimension of control by adding group enable signals that operate at a higher level than individual bit enables. This hierarchical enable structure allows parallel processing within groups while avoiding the need for exponential fanout to individual bits, effectively transforming the control architecture from flat to hierarchical.
2Productivity
If the depth of the shift register increases to process more data, then computational efficiency improves, but the enable tree becomes physically large and potentially unfeasible
Solution Approach 1:
The shift register is segmented into multiple groups, each processed by a separate enable tree. This allows the system to handle deep shift registers by distributing the enable signaling across multiple smaller, manageable trees rather than requiring one excessively large tree.
Solution Approach 2:
The system performs preliminary grouping of data bits before enable signaling occurs. By pre-organizing bits into groups and assigning group enable signals in advance, the system avoids the need for complex real-time enable tree expansion as shift register depth increases.
3Speed
If conventional enable trees are used for logical gate operations, then data can be transmitted in parallel, but significant delay and resource inefficiencies occur
Solution Approach 1:
The patent employs periodic enable signaling where groups of bits are enabled in successive cycles rather than all at once. This periodic approach allows earlier groups to be processed and forwarded while later groups are being enabled, overlapping operations to reduce overall delay.
Solution Approach 2:
Groups of data bits are pre-loaded and pre-positioned in the shift register before their corresponding group enable signals are activated. This preliminary positioning allows immediate parallel processing upon enablement, minimizing the time from enable signal to complete parallel operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves efficient conversion of serial data to parallel data with reduced circuit size, lower energy consumption, and improved time efficiency by mitigating the exponential growth of enable trees, resulting in cost-effective and timely data processing.
Implementation Method 1
superconducting Josephson junctions... transfer data based on providing pulses on transmission lines (e.g., passive transmission lines (PTLs) or Josephson transmission lines (JTLs))
Data Source
AI summary
One example includes a superconducting serial-to-parallel converter system. The system includes a plurality of serial-input-parallel-output (SIPO) cells arranged in a sequence between a first SIPO cell and a last SIPO cell. Each of the SIPO cells is configured to convert a plurality of serial superconducting bits of a serial data stream into a set of parallel superconducting bits in response to an enable pulse. The enable pulse is provided through the sequence of SIPO cells from the first SIPO cell to the last SIPO cell based on the clock signal. The serial data stream is provided through the sequence of the SIPO cells from the last SIPO cell to the first SIPO cell based on a clock signal.