U1AFS250-FG256 Datasheet, PDF (17/27 Pages) Actel Corporation – 3 - DC and Power Characteristics

Actel Fusion Mixed-Signal FPGA for the MicroBlade AdvancedMC Solution
Power Calculation Methodology
This section describes a simplified method to estimate power consumption of an application. For
more accurate and detailed power estimations, use the SmartPower tool in the Libero IDE
software.
The power calculation methodology described below uses the following variables:
• The number of PLLs as well as the number and the frequency of each output clock
generated
• The number of combinatorial and sequential cells used in the design
• The internal clock frequencies
• The number and the standard of I/O pins used in the design
• The number of RAM blocks used in the design
• The number of NVM blocks used in the design
• The number of Analog Quads used in the design
• Toggle rates of I/O pins as well as VersaTiles—guidelines are provided in Table 3-13 on
page 3-21.
• Enable rates of output buffers—guidelines are provided for typical applications in
Table 3-14 on page 3-21.
• Read rate and write rate to the RAM—guidelines are provided for typical applications in
Table 3-14 on page 3-21.
• Read rate to the NVM blocks
The calculation should be repeated for each clock domain defined in the design.
Methodology
Total Power Consumption—P_TOTAL
Operating Mode, Standby Mode, and Sleep Mode
P_TOTAL = P_STAT + P_DYN
P_STAT is the total static power consumption.
P_DYN is the total dynamic power consumption.
Total Static Power Consumption—P_STAT
Operating Mode
P_STAT = P_DC1 + (N_NVM-BLOCKS * P_DC4) + P_DC5+ (N_QUADS * P_DC6) + (N_INPUTS * P_DC7) + (N_OUTPUTS * P_DC8) +
(N_PLLS * P_DC9)
N_NVM-BLOCKS is the number of NVM blocks available in the device.
N_QUADS is the number of Analog Quads used in the design.
N_INPUTS is the number of I/O input buffers used in the design.
N_OUTPUTS is the number of I/O output buffers used in the design.
N_PLLS is the number of PLLs available in the device.
Standby Mode
P_STAT = P_DC2
Sleep Mode
P_STAT = P_DC3
Total Dynamic Power Consumption—P_DYN
Operating Mode
P_DYN = P_CLOCK + P_S-CELL + P_C-CELL + P_NET + P_INPUTS + P_OUTPUTS + P_MEMORY + P_PLL + P_NVM+ P_XTL-OSC +
P_RC-OSC + P_AB
Preliminary v0.4
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