Strobe Transmission Circuit to Suppress Bus Reflection and Ringing
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Solution Overview
Problem
In semiconductor systems, signal reflection and energy remaining in transmission lines can cause unnecessary toggling or ringing, leading to mis-operation and garbage data reception due to the capacitance of transmission and reception circuits.
Innovation Solution
A transmission circuit with a strobe control circuit and output driver is introduced, which generates strobe driving signals based on operation information and a clock signal to drive the signal transmission line to a specified level for a predetermined time after data transmission is completed, preventing unwanted energy reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If data transmission is completed and the transmission circuit stops driving the signal transmission line, then energy consumption is reduced, but signal reflection and ringing occur due to remaining energy in the bus
Solution Approach 1:
The transmission circuit performs a preliminary action by extending the postamble period and continuing to drive the signal transmission line to a specified logic level for a predetermined time after data transmission is completed. This preliminary extension of the driving period ensures that remaining energy in the bus is fully discharged before the transmission circuit stops, preventing signal reflection and ringing phenomena.
2Object-generated harmful factors
If the transmission circuit drives the signal transmission line for a longer period after transmission completion, then signal reflection is prevented, but transmission time is extended
Solution Approach 1:
The transmission circuit changes the parameter of the postamble period by extending it for a predetermined time after data transmission completion. During this extended period, the transmission circuit maintains the signal transmission line at a specified logic level to discharge remaining energy. This parameter change effectively prevents signal reflection and ringing while minimizing the time extension, as the circuit stops driving once the predetermined period elapses.
3Reliability
If the bus capacitance is considered in the transmission design, then signal integrity can be maintained, but unnecessary toggling or ringing occurs until remaining energy is exhausted
Solution Approach 1:
The invention converts the harmful effect of bus capacitance, which causes remaining energy and signal reflection, into a beneficial outcome. By extending the postamble period and continuing to drive the signal transmission line to a specified logic level after data transmission, the circuit utilizes the bus capacitance to its advantage, ensuring that remaining energy is fully discharged in a controlled manner. This prevents unnecessary toggling or ringing and maintains signal integrity.
Data Source
AI summary
A transmission circuit may be provided. The transmission circuit may include a strobe control circuit and an output driver. The strobe control circuit may generate strobe driving signals based on information and a clock signal. The output driver may generate a strobe signal by driving a signal transmission line. The transmission circuit may drive the signal transmission line to a specified level for a predetermined time after transmission of the strobe signal is completed.