Communication Node Sleep Mode Code Writing via Shared Data Port
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Solution Overview
Problem
Existing communication systems require additional signal lines and ports to allow a control portion to write an assignment code in a transceiver's memory, leading to increased complexity and cost, as they do not efficiently manage the storage of assignment codes within communication nodes.
Innovation Solution
A communication node configuration that includes a control portion, a transceiver with a memory, an activation portion, a write-in portion, and a switch portion, allowing the control portion to write an assignment code in the memory using an existing transmission route, thereby reducing the need for additional signal lines and ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a direct access interface and dedicated signal line are added to allow the control portion to write an assignment code in the transceiver's memory, then the assignment code can be stored, but the number of signal lines and ports increases, leading to increased body magnitude and cost
Solution Approach 1:
The transmission route originally designed for data transmission between the control portion and transceiver is made multi-functional by enabling it to carry both data signals and assignment code write signals. The write-in portion utilizes this existing route to receive assignment codes from the control portion during sleep mode, eliminating the need for dedicated signal lines and reducing device complexity while maintaining reliability
Solution Approach 2:
The transceiver's memory and write-in portion are designed to autonomously receive and store assignment codes through the existing transmission route without requiring additional interface circuits or signal lines. The switch portion automatically connects the transmission route to the write-in portion during sleep mode, enabling the system to self-configure without external intervention
2Ease of manufacture
If the control portion remains in usual mode to write assignment codes, then writing can be performed, but power consumption increases compared to sleep mode
Solution Approach 1:
The system performs assignment code writing during sleep mode by utilizing the existing transmission route and write-in portion, which are activated through switching rather than full system wake-up. This preliminary action allows configuration data to be written before normal operation begins, reducing the time the control portion needs to remain in high-power usual mode
Data Source
AI summary
When an ECU serving as a communication node is under sleep mode, a switch portion in a transceiver connects a data transmit port of a microcomputer to a memory controller. The microcomputer sends, to the memory controller, a code write-in request for writing a code while outputting a write data that is written as the code. The data transmit port, which is to output a communication data, is commonly used in order to output the write-in request and the write data; this suppresses the increase in the number of connection lines between the microcomputer and the transceiver and the increase in the number of ports of the microcomputer.