Enhanced ground bounce immunity on USB type-C power delivery communication
A system and method for enhancing ground bounce immunity of cables such as USB type-C cables. More specifically, in certain embodiments, ground bounce immunity is enhanced by making use of alternate modes of operation of cables conforming to the USB 3.1 specification to achieve a higher power over a cable that conforms to the USB 3.1 voltage drop specification requirements on the ground signal paths when the cable is operating at normal power levels (i.e., at a power level supported by the USB 3.1 specification). In certain embodiments, ground bounce immunity is enhanced by making use of alternate modes of operation of USB 3.1 type cables and standard use USB3.1 power delivery negotiation protocol to allow a host and end device to negotiate higher power than what would normally conform to the USB 3.1 specification.
1. A computer-implementable method for enhancing ground bounce immunity of a cable, comprising:
determining whether a host and a device coupled to the cable are both capable of operating in a higher power mode of operation;
identifying availability of an alternate higher power mode of operation when the cable, the host and the device are all capable of operating in a higher power mode of operation, the cable indicating an availability of the higher power mode of operation via an electronic marker (E-marker), the E-marker indicating the availability of the higher power mode of operation when the host coupled to a first end of the cable and the device coupled to another end of the cable each support changing a configuration channel signal path reference voltage;
suspending communication between the host and the device prior to configuring the cable, the host and the device to operate in the higher power mode of operation;
configuring the cable, the host and the device to operate in the higher power mode of operation via a negotiation between the host and the device, the configuring comprising changing a reference voltage of the cable to operate in the higher power mode of operation; and,
communicating between the host and the device via the higher power mode of operation, the higher power mode of operation comprising changing the reference voltage to provide enhanced ground bounce immunity for the cable, the enhanced ground bounce immunity providing communication on the cable which is immune to ground bounce when compared to normal power levels of the cable, the normal power levels being defined by a specification for the cable, the ground bounce being defined as a transmission voltage which appears as less than a local ground potential; and
wherein the suspending communication includes suspending the configuration channel signal path while the host, the cable and the device all change their reference voltage and increase the voltage swing on the configuration channel signal path.
2. The method of claim 1 , wherein:
the changing the reference voltage of the cable to operate in the higher power mode of operation comprises increasing the reference voltage on the configuration channel signal path whole maintaining a constant cable resistance.
3. The method of claim 1 , wherein:
the cable corresponds to a USB type-C cable.
4. The method of claim 3 , wherein:
the reference voltage is changed on the configuration channel signal path.
5. The method of claim 1 , wherein:
a diameter of the cable is minimized when compared to a diameter that would be required without use of the negotiation operation.
6. The method of claim 1 , wherein:
a cable bundle is configured to fit properly with an over mold housing of a USB Type-C plug while also enabling the higher power mode of operation.
7. A system comprising:
a processor;
a data bus coupled to the processor; and
a non-transitory, computer-readable storage medium embodying computer program code, the non-transitory, computer-readable storage medium being coupled to the data bus, the computer program code interacting with a plurality of computer operations and comprising instructions executable by the processor and configured for:
determining whether a host and a device coupled to the cable are both capable of operating in a higher power mode of operation;
identifying availability of an alternate higher power mode of operation when the cable, the host and the device are all capable of operating in a higher power mode of operation, the cable providing an availability of the higher power mode of operation via an electronic marker (E-marker), the E-marker indicating the availability of the higher power mode of operation when the host coupled to a first end of the cable and the device coupled to another end of the cable each support changing a configuration channel signal path reference voltage;
suspending communication between the host and the device prior to configuring the cable, the host and the device to operate in the higher power mode of operation;
configuring the cable, the host and the device to operate in the higher power mode of operation via a negotiation between the host and the device, the configuring comprising changing a reference voltage of the cable to operate in the higher power mode of operation; and,
communicating between the host and the device via the higher power mode of operation, the higher power mode of operation comprising changing the reference voltage to provide enhanced ground bounce immunity for the cable, the enhanced ground bounce immunity providing communication on the cable which is immune to ground bounce when compared to normal power levels of the cable, the normal power levels being defined by a specification for the cable, the ground bounce being defined as a transmission voltage which appears as less than a local ground potential; and
wherein
the suspending communication includes suspending the configuration channel signal path while the host, the cable and the device all change their reference voltage and increase the voltage swing on the configuration channel signal path.
8. The system of claim 7 , wherein:
the changing the reference voltage of the cable to operate in the higher power mode of operation comprises increasing the reference voltage on the configuration channel signal path whole maintaining a constant cable resistance.
9. The system of claim 7 , wherein:
the cable corresponds to a USB type-C cable.
10. The system of claim 9 , wherein:
the reference voltage is changed on the configuration channel signal path.
11. The system of claim 7 , wherein:
a diameter of the cable is minimized when compared to a diameter that would be required without use of the negotiation operation.
12. The system of claim 7 , wherein:
a cable bundle is configured to fit properly with an over mold housing of a USB Type-C plug while also enabling the higher power mode of operation.
13. An environment for enhancing ground bounce immunity comprising:
a cable, the cable being capable of operating in a normal power mode of operation and a higher power mode of operation, the cable indicating an availability of the higher power mode of operation via an electronic marker (E-marker), the E-marker indicating the availability of the higher power mode of operation when the host coupled to a first end of the cable and the device coupled to another end of the cable each support changing a configuration channel signal path reference voltage;
a host coupled to an end of the cable, the host being capable of operating in a higher power mode of operation;
a device coupled to another end of the cable, the device being capable of operating in a higher power mode of operation,
the host and the device being configured to:
identify availability of an alternate higher power mode of operation when the host and the device are both capable of operating in a higher power mode of operation;
suspending communication between the host and the device prior to configuring the cable, the host and the device to operate in the higher power mode of operation;
configuring the cable, the host and the device to operate in the higher power mode of operation via a negotiation between the host and the device, the configuring comprising changing a reference voltage of the cable to operate in the higher power mode of operation; and,
communicating between the host and the device via the higher power mode of operation, the higher power mode of operation comprising changing the reference voltage to provide enhanced ground bounce immunity for the cable, the enhanced ground bounce immunity providing communication on the cable which is immune to ground bounce when compared to normal power levels of the cable, the normal power levels being defined by a specification for the cable, the ground bounce being defined as a transmission voltage which appears as less than a local ground potential; and
wherein
the suspending communication includes suspending the configuration channel signal path while the host, the cable and the device all change their reference voltage and increase the voltage swing on the configuration channel signal path.
14. The environment of claim 13 , wherein:
the changing the reference voltage of the cable to operate in the higher power mode of operation comprises increasing the reference voltage on the configuration channel signal path whole maintaining a constant cable resistance.
15. The environment of claim 13 , wherein:
the cable corresponds to a USB type-C cable.
16. The environment of claim 15 , wherein:
the reference voltage is changed on the configuration channel signal path.
17. The environment of claim 13 , wherein:
a diameter of the cable is minimized when compared to a diameter that would be required without use of the negotiation operation.
18. The environment of claim 13 , wherein:
a cable bundle is configured to fit properly with an over mold housing of a USB Type-C plug while also enabling the higher power mode of operation.