Method, system, and apparatus for dynamically configuring the operating point utilized for thermal management of an integrated circuit
Methods and circuits to define a thermal operating mode for a integrated device by defining an operating voltage and a frequency range.
1. A method for selecting a bus ratio for a reduced power operating mode of an integrated device comprising:
receiving a bus frequency that is supported by the integrated device;
selecting one of a plurality of offset values based at least in part on the bus frequency;
defining the bus ratio for the reduced power operating mode based at least in part on a startup bus ratio and the offset value; and
operating the integrated device at the defined bus ratio in response to a need to reduce power consumption unless the defined bus ratio is less than a predetermined bus ratio.
2. The method of claim 1 wherein the predetermined bus ratio is a minimum bus ratio that is supported by the integrated device.
3. The method of claim 1 wherein the plurality of offset values is calculated based on a projected power estimate and are coded in logic of the integrated device.
4. The method of claim 1 wherein the bus ratio is defined by subtracting the selected offset value from the startup bus ratio.
5. The method of claim 4 wherein the integrated device is a processor.
6. The method of claim 1 further comprising choosing an alternate reduced power operating mode if the defined bus ratio is less than the predetermined bus ratio.
7. A method for defining a reduced power operating mode for an integrated device comprising:
testing the integrated device to determine an operating voltage for the reduced power operating mode;
storing the reduced power operating voltage within a plurality of fuses;
receiving a bus frequency that is supported by the integrated device;
selecting one of a plurality of offset values based at least in part on the bus frequency;
defining a bus ratio for the reduced power operating mode based at least in part on a startup bus ratio and the offset value; and
operating the integrated device at the bus ratio in response to a desire to reduce power consumption unless the defined bus ratio is less than a predetermined bus ratio.
8. The method of claim 7 wherein the predetermined bus ratio is a minimum bus ratio that is supported by the integrated device.
9. The method of claim 8 further comprising choosing a different reduced power operating mode if the defined reduced power operating mode bus ratio is less than the predetermined minimum bus ratio.
10. The method of claim 9 wherein the integrated device is a processor.
11. The method of claim 7 wherein the plurality of offset values is calculated based on a projected power estimate and are coded in logic of the integrated device.
12. The method of claim 7 wherein the bus ratio is defined by subtracting the selected offset value from the startup bus ratio.
13. A circuit to determine a bus ratio for a reduced power operating mode of an integrated device comprising:
a multiplexer to receive a plurality of offset values and a bus frequency that is supported by the integrated device and to forward one of the offset values based at least in part on the bus frequency;
a logic to define the reduced power bus ratio as a startup bus ratio minus the selected offset value; and
to operate the integrated device at the bus ratio unless the bus ratio is less than a predetermined bus ratio.
14. The circuit of claim 13 wherein the predetermined bus ratio is a minimum bus ratio that is supported by the integrated device.
15. The circuit of claim 13 wherein the plurality of offset values is calculated based on a projected power estimate and are coded into a register transfer level (RTL).
16. The circuit of claim 15 wherein the integrated device is a processor.
17. The circuit of claim 13 further comprises to utilize a different reduced power operating mode if the defined bus ratio is less than the predetermined bus ratio.