Serial Data Bit Rate Change Confirmation Without Control Lines
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Solution Overview
Problem
Conventional clock data recovery systems require complex protocols and additional control signal lines to manage bit rate changes, leading to increased costs and power consumption, and risk signal collisions.
Innovation Solution
A communication system with a transmission device that sends a serial data signal with a constant value across a multiple of the clock cycle when the bit rate changes, and a receiving device that uses training data to confirm the new bit rate without additional control signal lines, allowing for reliable bit rate confirmation with a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interactive communication control signal lines are provided between transmission device and receiving device to transfer bit rate change commands, then bit rate confirmation can be achieved, but the control circuit size increases and protocol complexity increases
Solution Approach 1:
The patent merges the bit rate change notification function with the existing serial data signal transmission path. Instead of using separate control signal lines for interactive communication, the transmission device embeds bit rate change information directly in the serial data signal by setting it to a constant value for a predetermined period. This eliminates the need for additional control circuits and protocol management while maintaining reliable bit rate confirmation capability.
Solution Approach 2:
The serial data signal is given multiple functions: it serves both as the primary data transmission carrier and as the control signal for bit rate change notification. By utilizing the existing serial data signal for dual purposes, the patent avoids adding dedicated control signal lines and reduces overall system complexity while ensuring reliable bit rate confirmation.
2Reliability
If interactive communication control signal lines are provided for bit rate confirmation, then bit rate change can be managed, but the protocol becomes complicated to prevent signal collisions
Solution Approach 1:
The patent combines the bit rate change notification function with the existing serial data signal transmission. The transmission device sets the serial data signal to a constant value for a predetermined period to indicate bit rate changes, eliminating the need for separate control protocols and preventing signal collisions by using a unified transmission path.
Solution Approach 2:
The patent extracts the control signal function from the interactive communication protocol and integrates it directly into the serial data signal transmission. This removes the need for complex protocol handshaking and collision prevention mechanisms while maintaining reliable bit rate change management.
3Ease of operation
If two separate control signal lines are provided for respective directions, then communication can be achieved, but the number of control signal lines increases leading to higher costs and power consumption
Solution Approach 1:
The patent merges the control signal transmission for bit rate changes with the existing unidirectional serial data signal line. By embedding control information in the data signal itself, the system maintains full communication capability without adding any additional control signal lines, thereby reducing cost and power consumption.
Solution Approach 2:
The serial data signal line performs multiple functions: it transmits both normal data and control signals for bit rate changes. This multi-functional usage eliminates the need for separate control signal lines while preserving complete communication capability between transmission and receiving devices.
Data Source
AI summary
Provided are a transmission device, a receiving device, and a communication system having a simple configuration and capable of reliably executing the confirmation of a changed bit rate. The communication system 1 sends, to the receiving device 3, a serial data signal Sdata that is set as a constant value across a period of a constant multiple of a cycle of the clock when a bit rate of a serial data signal Sdata in the transmission device 2 is changed. The receiving device 3 that received the serial data signal Sdata receives training data Tdata from the transmission device 2 when it is determined that the serial data signal Sdata is a constant value across a period of a constant multiple of a cycle of the clock, and proceeds to the processing of confirming the changed bit rate.