4 Results Sheet

The Results sheet gives a lot of information based upon the use case entered.

Thermal power estimate:

• The primary output of the estimation is shown in cells A10 to D26; this table gives the total power of the device at various temperatures.
  • Because the leakage power is very nearly exponential, the leakage component can be interpolated between any two consecutive temperatures: P_LKG=10^mT_j+b
• Cells A1 to B8 contain reference information about the tool and the use case.
• Some users find it helpful to have the power breakdown by rail, and those results are provided in cell A30 to F114.
• Cells H52 to J146 provide information – utilization and frequencies -- on the use case estimated.
• Cells H22 to J49 show how the device’s power domains have been configured.
  Note:

  In the Environmental section of the Use Case tab, the user selects the voltage for configurable voltage domains. Within a voltage domain (e.g. VDD_CPU_AVS), some circuitry is placed within a power domain (e.g. C7x_0 and MMA are within PD_C7_0); the power domain can break the connection to the voltage domain if-and-only-if all of the IP within the power domain is unused. Circuitry within an off power domain, do not contribute power – leakage or dynamic – to the power budget. Within the power domain, IP is controlled by a local power sleep controller (LPSC) which controls the clock and reset to the IP. IP which is not clocked does not contribute dynamic power to the overall device power but it will contribute leakage power unless it resides in an unpowered power domain.

  Note that a voltage domain typically has some IP that is within a power domain and other IP that is not within a power domain.

  • When possible, the tool powers OFF the power domain; if the user wants to keep the domain ON, it is recommended to load IP utilization within the domain at 0.1%
  • The user should configure their software to match the expectations defined in the power estimate.
• Cells H11 to I19 show a breakdown of power by block; this table shows that significant power is present in the back-plane of the device.

Peak / PDN power estimate:

• Cells M30 to R117 contain the by-rail Peak / PDN estimate; this estimate is derived from the entered use case.
  • Column U creates a label V_G1 through V_G18 (i.e. voltage group). These are just labels and can be modified by the user.
  • The same labels are present in cells N8 to N25; if the user modifies the labels in column U, the labels should also be modified in this range. Cells O2 to O19 sum the current for this voltage group.