U1AFS250-FG256 Datasheet, PDF (18/27 Pages) Actel Corporation – 3 - DC and Power Characteristics

DC and Power Characteristics
Standby Mode
P_DYN = P_XTL-OSC
Sleep Mode
P_DYN = 0 W
Global Clock Dynamic Contribution—P_CLOCK
Operating Mode
P_CLOCK = (P_AC1 + N_SPINE * P_AC2 + N_ROW * PAC3 + N_S-CELL * P_AC4) * F_CLK
N_SPINE is the number of global spines used in the user design—guidelines are provided in
Table 3-13 on page 3-21.
N_ROW is the number of VersaTile rows used in the design—guidelines are provided in
Table 3-13 on page 3-21.
F_CLK is the global clock signal frequency.
N_S-CELL is the number of VersaTiles used as sequential modules in the design.
Standby Mode and Sleep Mode
P_CLOCK = 0 W
Sequential Cells Dynamic Contribution—P_S-CELL
Operating Mode
P_S-CELL = N_S-CELL * (P_AC5 + (α₁ / 2) * P_AC6) * F_CLK
N_S-CELL is the number of VersaTiles used as sequential modules in the design. When a multi-
tile sequential cell is used, it should be accounted for as 1.
α₁ is the toggle rate of VersaTile outputs—guidelines are provided in Table 3-13 on
page 3-21.
F_CLK is the global clock signal frequency.
Standby Mode and Sleep Mode
P_S-CELL = 0 W
Combinatorial Cells Dynamic Contribution—P_C-CELL
Operating Mode
P_C-CELL = N_C-CELL* (α₁ / 2) * P_AC7 * F_CLK
N_C-CELL is the number of VersaTiles used as combinatorial modules in the design.
α₁ is the toggle rate of VersaTile outputs—guidelines are provided in Table 3-13 on
page 3-21.
F_CLK is the global clock signal frequency.
Standby Mode and Sleep Mode
P_C-CELL = 0 W
Routing Net Dynamic Contribution—P_NET
Operating Mode
P_NET = (N_S-CELL + N_C-CELL) * (α₁ / 2) * P_AC8 * F_CLK
N_S-CELL is the number VersaTiles used as sequential modules in the design.
N_C-CELL is the number of VersaTiles used as combinatorial modules in the design.
α₁ is the toggle rate of VersaTile outputs—guidelines are provided in Table 3-13 on
page 3-21.
F_CLK is the global clock signal frequency.
3-18
Preliminary v0.4