The power estimation spreadsheet provides power consumption estimates based on measured and simulated data; the tool is provided as is and does not provide a specified precision. Power consumption depends on electrical parameters, silicon process variations, environmental conditions, and use cases running on the processor during operation. Actual power consumption must be verified in the real system. This tool is meant for estimating power consumption during realistic operating modes and is not intended for power supply sizing. The power estimation spreadsheet is preliminary and subject to change. The spreadsheet can be downloaded from AM261X-PET-CALC.
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The power estimation tool consists of a spreadsheet that helps calculate the estimated power based on the inputs of the application use-case a user provides. The usage of the spreadsheet is explained further in the document. By default, the spreadsheet has the most commonly used use-case settings as its' inputs.
The spreadsheet consists of following 3 sections: Processing Elements, Interfaces and Power Report.
To use the input part the spreadsheet, users must modify the fields with the appropriate usage parameters. Cells designed for user input are in Yellow. Fields that cannot be modified are Gray. Fields in blue are the output calculated power. Configure the yellow cells to a value most closely aligned with your intended scenario.
The purpose of each of these sections is:
The Processing Elements section allows you to set the operating frequency, mode and load each compute core with utilization between 0%-100% (inclusive). Utilization here refers to the amount of time the core is utilized/active (expressed in-terms of percentage) within a fixed time frame.
Table 3-1 lists the selectable options.
| Processing Element | Frequency | Mode | Utilization |
|---|---|---|---|
| HSM (Hardware Security Module) | N/A | Secure Boot, Run Time Services | 0% – 100% |
| R5F Dual Core 0 | 500MHz, 400MHz, 250MHZ, 200MHz | Dual, Lockstep (AM2612) Single (AM2611) |
0% – 100% |
| ICSSM0 | 225MHz | N/A | 0% – 100% |
| ICSSM1 | 225MHz | N/A | 0% – 100% |
| CPSW | 200MHz | N/A | 0% – 100% |
The Interface section lets select the functional mode and utilization of a subset of the commonly used interfaces on the device. Utilization here refers to the amount of time the corresponding interface is utilized/active (expressed in-terms of percentage) within a fixed time frame.
Table 4-1 lists the selectable options.
| Interface | Mode | Utilization |
|---|---|---|
| CMPSS | on_3p3v, Unused, Off | 0%-100% |
| ADC | on_3p3v, Unused, Off | 0%-100% |
| DAC | on_3p3v, Unused, Off | 0%-100% |
| Ethernet[0:1] | RGMII/RMII/MII, 10/100/1000MPBS, 3p3v/1p8v, Unused, Off | 0%-100% |
| OSPI[0:1] | Controller/Peripheral, DDR/SDR, 3p3v/1p8v 200MHz/166MHz/133MHz/100MHz/ 80MHz/67MHz/60MHz/10MHz, Off |
0%-100% |
| GPMC | 16b, 3p3v/1p8v, 133MHz/100MHz/10MHz, Unused, Off |
0%-100% |
| USB | power_down, sleep, device[HS:FS:LS]/idle, host[HS:FS:LS]/idle | 0%-100% |
| EPWM | on_3p3v, Unused, Off | 0%-100% |
| MCAN | 8MBPS, 3p3v, Unused, Off | 0%-100% |
| MCSPI | Controller/Peripheral, 3p3v/1p8v, 1.563/2.083/3.125/6.25/12.5/25/40MBPS, Unused, Off |
0%-100% |
The Power Report section contains the generated output of the Power Estimation Tool. The report lists the power supply name, the voltage in Volts (V), and the power consumption in Watts (W) per power rail group.
Table 6-1 shows the selectable fields for the following power rails options.
| Voltage Rail | Selectable Options (V) |
|---|---|
| VDD | 0.9 - 1.4 (1.20 Default) |
| VDD_SRAM | 0.9 - 1.4 (1.20 Default) |
| VDDA | 3.135, 3.3, 3.465 (3.3 Default) |
This document provides a comprehensive guide to estimating power consumption for the AM261x processor, enabling developers to make informed decisions about the system's power requirements. By utilizing the tool, users can gain a better understanding of how various factors, such as processing elements, interfaces, and environmental conditions, impact power consumption. This knowledge can be leveraged to optimize system design, making sure of efficient power usage and reliable performance. Overall, the document serves as a valuable resource for developers seeking to balance power efficiency with system functionality, facilitating the creation of effective applications.
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