Altera Corporation
95
FLEX 10KE Embedded Programmable Logic Family Data Sheet
The ICCACTIVE value can be calculated with the following equation:
ICCACTIVE = K × fMAX × N × togLC ×
Where:
fMAX
=
Maximum operating frequency in MHz
N
=
Total number of LEs used in the device
togLC
=
Average percent of LEs toggling at each clock
(typically 12.5%)
K
=
Constant
Table 82 provides the constant (K) values for FLEX 10KE devices.
This calculation provides an ICC estimate based on typical conditions with
no output load. The actual ICC should be verified during operation
because this measurement is sensitive to the actual pattern in the device
and the environmental operating conditions.
To better reflect actual designs, the power model (and the constant K in
the power calculation equations) for continuous interconnect FLEX
devices assumes that LEs drive FastTrack Interconnect channels. In
contrast, the power model of segmented FPGAs assumes that all LEs
drive only one short interconnect segment. This assumption may lead to
inaccurate results when compared to measured power consumption for
actual designs in segmented FPGAs.
Figure 29 shows the relationship between the current and operating
frequency of FLEX 10KE devices.
Table 82. FLEX 10KE K Constant Values
Device
K Value
EPF10K30E
4.5
EPF10K50E
4.8
EPF10K50S
4.5
EPF10K100B
5.0
EPF10K100E
4.5
EPF10K130E
4.6
EPF10K200E
4.8
EPF10K200S
4.6
A
MHz
LE
×
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