Optical Transceiver Program Download via I2C Control Pins
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Solution Overview
Problem
Optical transceivers, such as SFP and XFP, lack additional terminals for downloading revised control programs, making it difficult to update their control software without modifying their mechanical or electrical architecture.
Innovation Solution
Incorporating a download interface with a clock terminal and a data terminal, where the clock terminal is pulled down to ground using a resistor, allowing the host system to detect the transceiver's presence and enabling program downloads using existing control pins, MOD_DEF0, MOD_DEF1, and MOD_DEF2, following the I2C standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional terminals are added to the optical transceiver for downloading control programs, then program download capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent makes existing control terminals (MOD_DEF0, MOD_DEF1, MOD_DEF2) serve dual purposes: their original control functions and program download functions. By configuring these terminals as I2C interface pins (SDA, SCL, and control signal lines), the transceiver can download programs through existing connectors without adding extra terminals, thus achieving multi-functionality and resolving the contradiction between download capability and device complexity
Solution Approach 2:
The optical transceiver uses its own existing control signal lines and connectors to perform the program download function, rather than requiring external dedicated download interfaces. The controller internally switches between control mode and download mode, allowing the device to serve itself for program updates without additional hardware infrastructure
2Device complexity
If existing control pins are reused for program download, then device complexity is reduced, but signal interference and functional conflict may occur
Solution Approach 1:
The patent implements dynamic terminal configuration where the controller can switch between control mode and download mode. During download operations, the control terminals are temporarily reconfigured as I2C interface pins, while during normal operation, they return to their original control functions. This dynamic switching prevents signal interference and functional conflicts by ensuring only one function is active at a time
Solution Approach 2:
Before initiating program download, the controller preliminarily configures the relevant terminals as I2C interface pins and sets the download interface to operational mode. This preliminary configuration ensures that the terminals are properly prepared for download operations, preventing signal conflicts and ensuring reliable communication throughout the download process
Data Source
AI summary
Methods to load control programs into an optical transceiver whose specifications follow the standards are disclosed. The standard transceiver, such as SFP transceiver and/or XFP transceiver, provides control terminals in addition to the serial interface to communicate with the host device. The control terminals are inactive when the transceiver is output of the host device. The loader to load the program utilizes those control terminals and the optical transceiver of the invention provides mechanisms to use those control terminals for downloading the program.