Asynchronous transceiver for on-vehicle electronic device
An on-vehicle electronic device has a generating unit configured to generate a first clock for data communication with another on-vehicle electronic device through a CXPI communication network; and an adjusting unit configured to adjust a duty width of the first clock.
1. A device comprising:
a controller coupled to a transceiver to operate as a slave node over a communication bus, each of the controller and the transceiver configured to operate in at least a standby mode and a normal mode;
wherein the transceiver is configured to:
receive an encoded reference clock signal from a master node over the communication bus, while the transceiver operates in the standby mode;
send the encoded reference clock signal to the controller; and
wherein the controller is configured to detect the encoded reference clock signal sent by the transceiver, while the controller operates in the standby mode.
2. The device of claim 1 , wherein while in the standby mode, the transceiver is configured to forgo transmission to the controller of a data signal that is encoded in the encoded reference clock signal.
3. The device of claim 1 , wherein the transceiver is configured to send the encoded reference clock signal to an interrupt input of the controller, and the controller is configured to detect the encoded reference clock signal at the interrupt input.
4. The device of claim 1 , wherein the controller is configured to send a wake-up signal to the master node through the transceiver, and the transceiver is configured to receive the encoded reference clock signal from the master node in response to the wake-up signal.
5. The device of claim 1 , wherein in response to detection of the encoded reference clock signal, the controller is configured to:
transition to operate in the normal mode; and
send an enable signal to the transceiver.
6. The device of claim 5 , wherein in response to the enable signal from the controller, the transceiver is configured to:
transition to operate in the normal mode;
decode the encoded reference clock signal to generate a data signal and a threshold clock signal; and
send the data signal and the threshold clock signal to the controller.
7. The device of claim 1 , wherein the communication bus comprises a Clock Extension Peripheral Interface (CXPI) bus and the CXPI bus is disposed in a vehicle.
8. A method comprising:
sending, by a controller in a slave node, a wake-up signal to a master node over a communication bus, while the controller is operating in a standby mode;
receiving, by a transceiver in the slave node, an encoded reference clock signal from the master node in response to the wake-up signal, while the transceiver is operating in the standby mode;
sending, by the transceiver, the encoded reference clock signal to the controller; and
detecting, by the controller, the encoded reference clock signal sent by the transceiver.
9. The method of claim 8 , further comprising forgoing transmission to the controller of a data signal that is encoded in the encoded reference clock signal, while the transceiver is operating in the standby mode.
10. The method of claim 8 , wherein:
sending the encoded reference clock signal comprises sending, by the transceiver, the encoded reference clock signal to an interrupt input of the controller; and
detecting the encoded reference clock signal comprises receiving the encoded reference clock signal at the interrupt input of the controller.
11. The method of claim 8 , further comprising:
in response to detecting the encoded reference clock signal, transitioning the controller to a normal mode and sending an enable signal to the transceiver.
12. The method of claim 11 , further comprising:
in response to receiving the enable signal, performing operations comprising:
transitioning the transceiver to the normal mode;
decoding, by the transceiver, the encoded reference clock signal to generate a data signal and a threshold clock signal; and
sending, by the transceiver, the data signal and the threshold clock signal to the controller.
13. The method of claim 8 , wherein the communication bus comprises a Clock Extension Peripheral Interface (CXPI) bus and the CXPI bus is disposed in a vehicle.
14. A system disposed in a vehicle, the system comprising:
a Clock Extension Peripheral Interface (CXPI) bus;
a master node coupled to the CXPI bus and configured to operate in at least a standby mode and a normal mode; and
a slave node coupled to the CXPI bus and configured to operate in at least the standby mode and the normal mode, the slave node comprising:
a controller coupled to a transceiver;
the transceiver configured to:
receive an encoded reference clock signal from the master node over the CXPI bus, while the transceiver operates in the standby mode;
send the encoded reference clock signal to the controller; and
the controller configured to detect the encoded reference clock signal sent by the transceiver, while the controller operates in the standby mode.
15. The system of claim 14 , wherein while in the standby mode, the transceiver is configured to forgo transmission to the controller of a data signal that is encoded in the encoded reference clock signal.
16. The system of claim 14 , wherein the transceiver is configured to send the encoded reference clock signal to an interrupt input of the controller, and the controller is configured to detect the encoded reference clock signal at the interrupt input.
17. The system of claim 14 , wherein the controller is configured to send a wake-up signal to the master node through the transceiver, and the transceiver is configured to receive the encoded reference clock signal from the master node in response to the wake-up signal.
18. The system of claim 17 , wherein the master node is configured to receive the wake-up signal and, in response to the wake-up signal, to transition to the normal mode and send the encoded reference clock signal to the slave node.
19. The system of claim 14 , wherein in response to detection of the encoded reference clock signal, the controller is configured to:
transition to operate in the normal mode; and
send an enable signal to the transceiver.
20. The system of claim 19 , wherein in response to the enable signal from the controller, the transceiver is configured to:
transition to operate in the normal mode;
decode the encoded reference clock signal to generate a data signal and a threshold clock signal; and
send the data signal and the threshold clock signal to the controller.