Assuring failsafe radio transmit power level control in hardware
An information handling system includes a failsafe circuit connected to a first power control interconnect conductor, to a second power control interconnect conductor, and to a processor status interconnect conductor. A processor may provide a first level indicating an operational status of the processor to the processor status interconnect conductor when the processor is operational, and provide a second level indicating a non-operational status of the processor to the processor status interconnect conductor when the processor is non-operational. The failsafe circuit may assure, upon provision of the second level to the processor status interconnect conductor, that the first power control interconnect conductor will be in a first failsafe state and the second power control interconnect conductor will be in a second failsafe state.
1. A method comprising:
applying a first power control interconnect conductor to a first terminal of a failsafe circuit;
applying a second power control interconnect conductor to a second terminal of the failsafe circuit;
applying a processor status interconnect conductor to a third terminal of a failsafe circuit;
configuring a processor to provide a first level indicating an operational status of the processor to the processor status interconnect conductor when the processor is operational and to provide a second level indicating a non-operational status of the processor to the processor status interconnect conductor when the processor is non-operational, the failsafe circuit configured to assure, upon provision of the second level to the processor status interconnect conductor, the first power control interconnect conductor will be in a first failsafe state and the second power control interconnect conductor will be in a second failsafe state; and
based on the first and second failsafe states, transmitting, by a radio circuit, at a failsafe transmit power level.
2. The method of claim 1 , wherein both the first failsafe state and the second failsafe state are a grounded state.
3. The method of claim 1 , wherein the applying the processor status interconnect conductor to the third terminal of the failsafe circuit comprises:
applying the processor status interconnect conductor to a gate terminal of a positive-channel (P-channel) metal-oxide-semiconductor field-effect transistor (MOSFET).
4. The method of claim 3 , wherein the applying the first power control interconnect conductor to the first terminal of the failsafe circuit comprises:
applying the first power control interconnect conductor through a first diode to a source terminal of the P-channel MOSFET.
5. The method of claim 4 , wherein the applying the second power control interconnect conductor to the second terminal of the failsafe circuit comprises:
applying the second power control interconnect conductor through a second diode to the source terminal of the P-channel MOSFET.
6. The method of claim 1 , wherein the first power control interconnect conductor is connected to the processor and to the radio circuit, and wherein the second power control interconnect conductor is connected to the processor and to the radio circuit.
7. The method of claim 1 , wherein, when the processor provides the first level indicating the operational status of the processor to the processor status interconnect conductor, the processor is configured to individually control the first power control interconnect conductor and the second power control interconnect conductor to select a transmit power level to be used by the radio circuit, the radio circuit connected to the first power control interconnect conductor and the second power control interconnect conductor.
8. An information handling system (IHS) comprising:
a processor;
a radio circuit; and
a failsafe circuit connected to a first power control interconnect conductor, to a second power control interconnect conductor, and to a processor status interconnect conductor, the processor configured to provide a first level indicating an operational status of the processor to the processor status interconnect conductor when the processor is operational and to provide a second level indicating a non-operational status of the processor to the processor status interconnect conductor when the processor is non-operational, the failsafe circuit configured to assure, upon provision of the second level to the processor status interconnect conductor, the first power control interconnect conductor will be in a first failsafe state and the second power control interconnect conductor will be in a second failsafe state, wherein based on the first and second failsafe states, the radio circuit to transmit at a failsafe transmit power level.
9. The IHS of claim 8 , wherein both the first failsafe state and the second failsafe state are a grounded state.
10. The IHS of claim 8 , wherein the failsafe circuit comprises a positive-channel (P-channel) metal-oxide-semiconductor field-effect transistor (MOSFET), and the processor status interconnect conductor is connected to a gate terminal of the MOSFET.
11. The IHS of claim 10 , wherein the failsafe circuit further comprises a first diode, and the first power control interconnect conductor is connected through the first diode to a source terminal of the MOSFET.
12. The IHS of claim 11 , wherein the failsafe circuit further comprises a second diode, and the second power control interconnect conductor is connected through the second diode to the source terminal of the MOSFET.
13. The IHS of claim 8 , wherein the first power control interconnect conductor is connected to the processor and to the radio circuit, and wherein the second interconnect conductor is connected to the processor and to the radio circuit.
14. The IHS of claim 8 , wherein, when the processor provides the first level indicating the operational status of the processor to the processor status interconnect conductor, the processor is configured to individually control the first power control interconnect conductor and the second power control interconnect conductor to select a transmit power level to be used by the radio circuit, the radio circuit connected to the first power control interconnect conductor and the second power control interconnect conductor.
15. A method comprising:
applying a first power control interconnect conductor to a first terminal of a failsafe circuit, the first power control interconnect conductor connected to a processor and to a radio circuit;
applying a second power control interconnect conductor to a second terminal of the failsafe circuit, the second power control interconnect conductor connected to the processor and to the radio circuit;
applying a processor status interconnect conductor to a third terminal of the failsafe circuit, the processor status interconnect conductor connected to the processor;
configuring the processor to provide a first logic level indicating an operational status of the processor to the processor status interconnect conductor when the processor is operational and to provide a second logic level indicating a non-operational status of the processor to the processor status interconnect conductor when the processor is non-operational, the failsafe circuit configured to assure, upon provision of the second logic level to the processor status interconnect conductor, the first power control interconnect conductor will be in a first failsafe state and the second power control interconnect conductor will be in a second failsafe state; and
based on the first and second failsafe states, transmitting, by a radio circuit, at a failsafe transmit power level.
16. The method of claim 15 , wherein both the first failsafe state and the second failsafe state are a grounded state.
17. The method of claim 15 , wherein the applying the processor status interconnect conductor to the third terminal of the failsafe circuit comprises:
applying the processor status interconnect conductor to a gate terminal of a positive-channel (P-channel) metal-oxide-semiconductor field-effect transistor (MOSFET).
18. The method of claim 17 , wherein the applying the first power control interconnect conductor to the first terminal of the failsafe circuit comprises:
applying the first power control interconnect conductor through a first diode to a source terminal of the P-channel MOSFET.
19. The method of claim 18 , wherein the applying the second power control interconnect conductor to the second terminal of the failsafe circuit comprises:
applying the second power control interconnect conductor through a second diode to the source terminal of the P-channel MOSFET.
20. The method of claim 15 , wherein, when the processor provides the first level indicating the operational status of the processor to the processor status interconnect conductor, the processor is configured to individually control the first power control interconnect conductor and the second power control interconnect conductor to select a transmit power level to be used by the radio circuit, the radio circuit connected to the first power control interconnect conductor and the second power control interconnect conductor.