Configurable transfer rates over a two-way ethernet link
An apparatus for data communication includes a sensor-transceiver and control logic. The sensor-transceiver is coupled to a sensor and connects by an Ethernet link of a communication network in a vehicle to a processor-transceiver that is coupled to a processor. In an upstream direction from the sensor-transceiver to the processor-transceiver, the sensor-transceiver transmits data to the processor-transceiver over the Ethernet link at an upstream data rate, and in a downstream direction from the processor-transceiver to the sensor-transceiver, receives data from the processor-transceiver over the Ethernet link at a downstream data rate. The control logic is configured to select the upstream data rate for communication in the upstream direction to be higher than the downstream data rate for communication in the downstream direction when operating in a first mode, and to select the upstream data rate to be lower than the downstream data rate when operating in a second mode.
1. An Ethernet Physical Layer (PHY) transceiver, comprising:
a data-path module, configured to be coupled to a sensor and to connect by a full-duplex Ethernet link of a communication network in a vehicle to a processor-transceiver that is coupled to a processor, wherein in an upstream direction to the processor-transceiver, the data-path module is configured to transmit data to the processor-transceiver over the Ethernet link at a selectable upstream data rate, and in a downstream direction from the processor-transceiver, to receive data from the processor-transceiver over the Ethernet link at a selectable downstream data rate; and
control logic, configured to:
when the Ethernet PHY transceiver is operating in a field-operation mode for operating while the vehicle is operational, select the upstream data rate to be higher than the downstream data rate;
when the Ethernet PHY transceiver is operating in a diagnostic mode a diagnostics procedure, the diagnostic mode being different from the field-operation mode, select the upstream data rate to be lower than the downstream data rate; and
configure the data-path module to operate at the selected upstream data rate and the selected downstream data rate.
2. The apparatus according to claim 1 , wherein the upstream data rate and the downstream data rate are selectable from among multiple predefined data transfer rates.
3. The apparatus according to claim 1 , wherein the control logic is configured to modify at least one of the upstream data rate and the downstream data rate upon switching between the field-operation mode and the diagnostics mode, and to allow communication with the processor-transceiver using the modified upstream and downstream data rates after verifying that the processor-transceiver has also switched to a same field-operation mode or diagnostics mode as the data-path module.
4. The apparatus according to claim 1 , wherein in the field-operation mode the data-path module sends sensor data to the processor via the processor-transceiver, and wherein in the diagnostics mode the data-path module receives updated firmware or software from the processor, or from a storage device coupled to the processor, via the processor-transceiver.
5. The apparatus according to claim 1 , wherein, in the field-operation mode, the control logic is configured to select the upstream data rate to correspond to a maximal data rate of the sensor data provided by the sensor.
6. The apparatus according to claim 1 , wherein the data-path module is configured to be coupled to one or more additional sensors, and wherein the control logic is configured to select the upstream data rate to correspond to a sum of maximal data rates of sensor data provided respectively by the sensor and the one or more additional sensors.
7. The apparatus according to claim 1 , wherein the control logic is configured to communicate with the processor-transceiver messages that are indicative of the respective upstream data rate and the downstream data rate.
8. The apparatus according to claim 1 , wherein, in addition to the field-operation and diagnostics modes, the data-path module is further configured to selectively operate in a high-data-rate mode, in which both the upstream data rate and the downstream data rate are selected to be higher than a predefined data transfer rate.
9. The apparatus according to claim 1 , wherein, in addition to the field-operation and diagnostics modes, the data-path module is further configured to selectively operate in a low-data-rate mode, in which both the upstream data rate and the downstream data rate are selected to be lower than a predefined data transfer rate.
10. The apparatus according to claim 1 , wherein the Ethernet link supports a maximal bidirectional rate, and wherein the data-path module is configured to select the upstream data rate such that a sum of the upstream data rate and the downstream data rate corresponds to the maximal bidirectional rate.
11. A method for data communication, comprising:
in a data-path module in an Ethernet Physical Layer (PHY) transceiver, the data-path module being coupled to a sensor and connected by a full-duplex Ethernet link of a communication network in a vehicle to a processor-transceiver that is coupled to a processor,
in an upstream direction to the processor-transceiver, transmitting data to the processor-transceiver over the Ethernet link at a selectable upstream data rate, and in a downstream direction from the processor-transceiver, receiving data from the processor-transceiver over the Ethernet link at a selectable downstream data rate; and
when the Ethernet PHY transceiver is operating in a field-operation mode for operating while the vehicle is operational, selecting the upstream data rate to be higher than the downstream data rate;
when the Ethernet PHY transceiver is operating in a diagnostic mode for performing a diagnostics procedure, the diagnostic mode being different from the field-operation mode, selecting the upstream data rate to be lower than the downstream data rate; and
configuring the data-path module to operate at the selected upstream data rate and the selected downstream data rate.
12. The method for data communication according to claim 11 , wherein the upstream data rate and the downstream data rate are selectable from among multiple predefined data transfer rates.
13. The method for data communication according to claim 11 , comprising modifying at least one of the upstream data rate and the downstream data rate upon switching between the field-operation mode and the diagnostics mode, and allowing communication with the processor-transceiver using the modified upstream and downstream data rates after verifying that the processor-transceiver has also switched to a same field-operation mode or diagnostics mode as the data-path module.
14. The method for data communication according to claim 11 , wherein in the field-operation mode, transmitting data to the processor-transceiver comprises sending by the data-path module sensor data to the processor via the processor-transceiver, and wherein in the diagnostics mode, receiving data from the processor-transceiver comprises receiving by the data-path module updated firmware or software from the processor, or from a storage device coupled to the processor, via the processor-transceiver.
15. The method for data communication according to claim 11 , wherein in the field-operation mode, selecting the upstream data rate comprises selecting the upstream data rate to correspond to a maximal data rate of the sensor data provided by the sensor.
16. The method for data communication according to claim 11 , wherein the data-path module is coupled to one or more additional sensors, and wherein selecting the upstream data rate comprises selecting the upstream data rate to correspond to a sum of maximal data rates of sensor data provided respectively by the sensor and the one or more additional sensors.
17. The method for data communication according to claim 11 , comprising communicating with the processor-transceiver messages that are indicative of the respective upstream data rate and the downstream data rate.
18. The method for data communication according to claim 11 , comprising, in addition to the field-operation and diagnostics modes, selectively operating in a high-data-rate mode, in which both the upstream data rate and the downstream data rate are selected to be higher than a predefined data transfer rate.
19. The method for data communication according to claim 11 , comprising, in addition to the field-operation and diagnostics modes, selectively operating in a low-data-rate mode, in which both the upstream data rate and the downstream data rate are selected to be lower than a predefined data transfer rate.
20. The method for data communication according to claim 11 , wherein the Ethernet link supports a maximal bidirectional rate, and wherein selecting the upstream data rate comprises selecting the upstream data rate such that a sum of the upstream data rate and the downstream data rate corresponds to the maximal bidirectional rate.