Peripheral device expansion card system
A computing system includes a system board having a system controller device with an interrupt input. A system expansion bus connector is located on the system board and includes power pin(s) and an interrupt signal pin connected to the interrupt input. A peripheral device expansion card system is coupled to the computing system through system expansion bus connector and includes a system power reporting device coupled to the power pin(s) to receive power from the computing system via the power pin(s), and a card controller device coupled to the system power reporting device and to the interrupt signal pin. The card controller device determines, using the system power reporting device, a power state of the computing system. The card controller device also sends, to the system controller device through the interrupt signal pin, an interrupt signal that the system controller device interprets as a hot plug event.
1. An Information Handling System (IHS), comprising:
a computing system that includes a system board having:
a system controller device; and
a system expansion bus connector that is located on the system board and that includes at least one power pin; and
a peripheral device expansion card system that is coupled to the computing system through system expansion bus connector and that includes:
a system power reporting device that is coupled to the at least one power pin and configured to:
receive power from the computing system via the at least one power pin; and
generate a power reporting signal from the power received via the at least one power pin; and
a card controller device that is coupled to the system power reporting device, wherein the card controller device is configured to:
identify the power reporting signal generated by the system power reporting device; and
determine a power state of the computing system using the power reporting signal.
2. The IHS of claim 1 , wherein the system power reporting device includes a voltage divider device that is configured to:
receive the power that provides a first power amount through the at least one power pin; and
provide the power reporting signal as a logical power reporting signal that indicates a second power amount that is less than the first power amount to the card controller device, and wherein the card controller device determines the power state of the computing system based on the second power amount.
3. The IHS of claim 1 , wherein the power state determined for the computing system is a power off state.
4. The IHS of claim 3 , wherein the system expansion bus connector includes a power sleep state signal pin that is coupled to the card controller device, and wherein the card controller device is configured to:
receive a power sleep state signal via the power sleep state signal pin; and
determine a power sleep state of the computing system using the power sleep state signal.
5. The IHS of claim 4 , wherein the power sleep state signal pin is a reserved pin as defined by the Peripheral Component Interconnect express (PCle) specification.
6. The IHS of claim 1 , wherein the power state determined for the computing system is a fully operational power state.
7. A peripheral device expansion card system, comprising:
a card base; and
a card expansion bus connector that is located on the card base, that is configured to couple to a system board, and that includes:
at least one power pin;
a system power reporting device that is located on the card base, coupled to the at least one power pin, and configured to:
receive power from a computing system via the at least one power pin; and
generate a power reporting signal from the power received via the at least one power pin; and
a card controller device that is coupled to the system power reporting device, wherein the card controller device is configured to:
identify the power reporting signal generated by the system power reporting device; and
determine a power state of the computing system using the power reporting signal.
8. The system of claim 7 , wherein the system power reporting device includes a voltage divider device that is configured to:
receive the power that provides a first power amount through the at least one power pin; and
provide the power reporting signal as a logical power reporting signal that indicates a second power amount that is less than the first power amount to the card controller device, and wherein the card controller device determines the power state of the computing system based on the second power amount.
9. The system of claim 7 , wherein the power state determined for the computing system is a power off state.
10. The system of claim 9 , wherein the card expansion bus connector includes a power sleep state signal pin that is coupled to the card controller device, and wherein the card controller device is configured to:
receive a power sleep state signal via the power sleep state signal pin; and
determine a power sleep state of the computing system using the power sleep state signal.
11. The system of claim 10 , wherein the power sleep state signal pin is a reserved pin as defined by the Peripheral Component Interconnect express (PCle) specification.
12. The system of claim 7 , wherein the power state determined for the computing system is a fully operational power state.
13. The system of claim 7 , further comprising:
a multiplexer that is located on the card base and coupled between the system power reporting device and the card controller device, wherein the multiplexer is configured to receive a first multiplexer input from the system power reporting device and, in response, provide a first multiplexer output to the card controller device for use in determining the power state of the computing system;
a sideband cable connector located on the card base; and
a power state pin that is located on the sideband cable connector and that is coupled to the multiplexer, wherein the multiplexer is configured to receive a second multiplexer input from the power state pin and provide the first multiplexer output to the card controller device for use in determining the power state of the computing system.
14. A method for determining a computing system power state in a peripheral device expansion card system, comprising:
receiving, by a system power reporting device that is located on a peripheral device expansion card system and coupled through at least one power connection to a computing system, power from the computing system via the at least one power connection;
generating, by the system power reporting device using the power received via the at least one power connection, a power reporting signal;
identifying, by a card controller device that is located on the peripheral device expansion card system, the power reporting signal generated by the system power reporting device; and
determining, by the card controller device using the power reporting signal, a power state of the computing system.
15. The method of claim 14 , further comprising:
receiving, by a voltage divider device included in the system power reporting device, the power that provides a first power amount through the at least one power connection; and
providing, by the voltage divider device, the power reporting signal as a logical power reporting signal that indicates a second power amount that is less than the first power amount to the card controller device, wherein the card controller device determines the power state of the computing system based on the second power amount.
16. The method of claim 14 , wherein the power state determined for the computing system is a power off state.
17. The method of claim 16 , further comprising:
receiving, by the card controller device via a power sleep state signal connection to the computing system, a power sleep state signal via the power sleep state signal connection; and
determining, by the card controller device using the power sleep state signal, a power sleep state of the computing system.
18. The method of claim 17 , wherein the power sleep state signal connection includes a reserved pin as defined by the Peripheral Component Interconnect express (PCle) specification.
19. The method of claim 14 , wherein the power state determined for the computing system is a fully operational power state.
20. The method of claim 14 , further comprising:
receiving, by a multiplexer that is located on the peripheral device expansion card system and coupled between the system power reporting device and the card controller device, a first multiplexer input from the system power reporting device and, in response, providing a first multiplexer output to the card controller device for use in determining the power state of the computing system; and
receiving, by the multiplexer from a power state connection that is provided by a sideband cable connector that is included on the peripheral device expansion card system, a second multiplexer input from the power state connection and, in response, providing the first multiplexer output to the card controller device for use in determining the power state of the computing system.