Data Output Hold Timing for Noise-Resistant IC Transmission
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Solution Overview
Problem
Existing semiconductor integrated circuits face challenges in accurately transmitting data due to power-supply noise, particularly when the data transmitting circuit switches its output to a high impedance state, leading to interference with subsequent data transmissions.
Innovation Solution
Incorporating a control circuit that manages the data output circuit to maintain the last output during a predetermined period after data transmission, reducing power-supply noise by controlling the termination circuit and data output circuit operations based on control signals, ensuring accurate data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the data output circuit switches to high impedance state after data transmission, then the data transmitting circuit can prepare for next data transmission, but power-supply noise occurs on signal lines causing inaccurate data transmission
Solution Approach 1:
The control circuit maintains the data output circuit in the data output state for a predetermined period after data transmission before switching to high impedance state. This preliminary extension of the data output state ensures that power-supply noise has sufficiently converged before the next data transmission begins, preventing noise from affecting subsequent data while still allowing timely preparation for next transmission.
2Reliability
If the data output circuit maintains data output state for extended period, then power-supply noise convergence is ensured, but energy consumption increases
Solution Approach 1:
The control circuit extends the data output state by a predetermined period, which is more than the minimum time needed for noise convergence, to ensure reliable noise suppression. This partial extension beyond the strict minimum ensures that even variations in noise convergence time do not compromise data transmission accuracy, while the extension is controlled to avoid excessive energy consumption.
Data Source
AI summary
Provided is a semiconductor integrated circuit according to an exemplary aspect of the present invention including a data transmitting circuit and a data receiving circuit that receives data transmitted from the data transmitting circuit. The data transmitting circuit includes a data output circuit that outputs the data or sets an output to a high impedance state, and a control circuit that outputs a control signal to the data output circuit so that the data output circuit outputs the data when the data transmitting circuit transmits the data, and the data output circuit keeps outputting data last output in the previous data transmission, during a predetermined period after the previous data transmission when the data transmitting circuit further transmits another data after transmitting the data.