Source-Synchronous Data I/O Timing With Tri-State Jitter Adjustment
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Solution Overview
Problem
Conventional semiconductor integrated circuits face challenges in maintaining high transfer rates and low latency during high-speed data signal transmission due to increased parasitic resistance and capacitance in microfabrication processes, leading to jitter and eye pattern degradation.
Innovation Solution
The implementation of a semiconductor integrated circuit with a transmitter and receiver circuit configuration that includes a pulse generator circuit and tri-state circuits to convert jitter into control signal jitter, along with optional temperature, voltage, and delay time adjustments, optimizing interconnects for high transfer rates and low latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data signals are transferred at high speed in microfabrication process, then transfer rate is improved, but parasitic resistance and capacitance increase causing eye pattern degradation
Solution Approach 1:
The pulse generator circuit generates control signals in advance based on the transmitted clock signal to pre-compensate for transmission delays. This preliminary action allows the receiver to properly sample data signals despite long interconnect delays and parasitic effects, maintaining eye pattern quality at high transfer rates
Solution Approach 2:
The pulse generator circuit acts as an intermediary between the transmitted clock signal and the data sampling process. It converts the clock signal into pulsed control signals that coordinate the tri-state circuits, effectively mediating the timing relationship between transmitter and receiver to overcome parasitic-induced jitter
2Area of stationary object
If interconnect length is increased to accommodate more macros, then chip area is optimized, but delay time and jitter increase
Solution Approach 1:
The pulse generator circuit performs preliminary timing adjustment by generating control signals synchronized to the transmitted clock before data arrives at the receiver. This advance preparation compensates for the cumulative delay introduced by long interconnects, allowing optimal sampling despite extended transmission distance
Solution Approach 2:
The system dynamically adjusts timing relationships through the pulse generator circuit, which continuously generates synchronized control signals based on the actual transmitted clock signal. This dynamic adaptation allows the system to maintain proper timing margins despite variations in interconnect length and parasitic effects
3Productivity
If gate length is reduced to increase transistor density, then integration density is improved, but interconnect performance degrades due to higher sheet resistance
Solution Approach 1:
The pulse generator circuit serves as an intermediary that compensates for degraded interconnect performance. By generating control signals synchronized to the actual clock signal, it mitigates the effects of higher parasitic resistance and capacitance resulting from reduced gate lengths and fine interconnect layers
Data Source
AI summary
An adjustment circuit including tri-state circuits is provided between a transmitter circuit and a receiver circuit. Jitter generated by transmission of a signal over a long-distance interconnect is reduced by being converted into jitter of control signals generated by a pulse generator circuit in the tri-state circuits.