Bidirectional Data Path Repeater With Self-Timed Signal Switching
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Solution Overview
Problem
Conventional bidirectional communication paths in data processing systems face performance and energy efficiency issues due to the need for repeater configuration signals and clock signals, which increase complexity and overhead, especially in complex interconnect structures, and repeater-less signaling techniques require custom design and precise device matching, limiting their versatility.
Innovation Solution
The apparatus employs two circuits connected in parallel to the bidirectional communication path, where one circuit is active and the other is passive, with transition detection and drive circuitry to switch the signal, allowing self-configuration and operation without external configuration or clock signals, enabling high-performance and energy-efficient data signal transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional repeater circuits with flip-flops and enable signals are used to control bidirectional communication, then signal propagation can be achieved, but logic overhead and interconnect overhead increase significantly
Solution Approach 1:
The patent extracts and removes the flip-flop and enable signal control logic from the repeater circuit. Instead of using conventional repeaters with complex control mechanisms, the invention uses simple passive resistive dividers that automatically sense voltage levels and steer signals bidirectionally without requiring any active control elements, thereby eliminating the logic overhead entirely.
Solution Approach 2:
The repeater circuit performs self-configuration automatically based on the voltage levels present on the bidirectional line. The resistive dividers and transmission gates self-adjust their state according to the signal direction without requiring external control signals, clock signals, or configuration inputs, making the system self-sufficient and eliminating control logic overhead.
2Reliability
If enable signals and clock signals are used to control repeater operation, then bidirectional signal propagation can be managed, but energy consumption increases
Solution Approach 1:
The patent removes all active control signals including enable signals and clock signals from the repeater circuit. The invention replaces these energy-consuming control mechanisms with passive resistive voltage dividers that automatically detect signal direction through voltage level sensing, eliminating the need for continuous energy supply to control logic.
Solution Approach 2:
The repeater circuit automatically detects signal direction and steers signals bidirectionally using passive voltage sensing and transmission gate control based solely on voltage levels. No external energy supply or control signals are required, as the circuit self-regulates based on the inherent voltage characteristics of the signal being transmitted.
3Reliability
If conventional repeater configurations with control signals are implemented, then signal direction can be managed, but performance degrades
Solution Approach 1:
The patent extracts all control signal generation and processing logic from the repeater circuit. By removing flip-flops, enable signal generators, and clock distribution networks, the invention eliminates the delays and overhead associated with control signal setup, allowing signals to propagate immediately without control logic intervention.
Solution Approach 2:
The repeater circuit immediately responds to voltage level changes on the bidirectional line and automatically steers signals in the correct direction without requiring control signal setup time. This self-reacting mechanism eliminates control signal delays and improves signal propagation speed and overall system performance.
4Reliability
If synchronizing signals are used to eliminate contention in bidirectional communication, then signal integrity can be maintained, but device complexity increases
Solution Approach 1:
The patent removes all synchronizing signal infrastructure including clock signals and contention arbitration logic. The invention uses passive resistive voltage dividers that inherently prevent contention by automatically sensing voltage levels and steering signals bidirectionally based on which side is currently driving the line, eliminating the need for external synchronization.
Solution Approach 2:
The repeater circuit automatically detects and resolves potential contention conditions through voltage level sensing. When one side drives the bidirectional line, the voltage level is naturally higher, and the resistive divider on the other side automatically detects this and switches to high-impedance state, preventing contention without requiring any synchronizing signals or arbitration logic.
Data Source
AI summary
An apparatus including a first circuit and a second circuit connected in parallel to the bidirectional communication path, and one of the first and second circuits being an active circuit monitoring a value of the data signal on the bidirectional communication path while the other of the first and second circuits being a passive circuit that is not monitoring the value of the data signal. The active circuit initially starts in a low gain state, but on detection of a transition by transition detection circuitry, it enters a high gain state where the switch circuitry disconnects the transition detection circuitry from the bidirectional communication path, and the drive circuitry is activated in order to drive the data signal on the bidirectional communication path to the opposite value. Once the data signal has been driven to the opposite value, the active circuit and the passive circuits switch states.