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| 型号： | A1460A-3PQG208C |
| 元件分类： | FPGA |
| 英文描述： | FPGA, 848 CLBS, 6000 GATES, 200 MHz, PQFP208 |
| 封装： | PLASTIC, QFP-208 |
| 文件页数： | 9/68页 |
| 文件大小： | 489K |
| 代理商： | A1460A-3PQG208C |
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1-191
Accelerator Series FPGAs – ACT 3 Family
Active Power Component
Power dissipation in CMOS devices is usually dominated by
the active (dynamic) power dissipation. This component is
frequency dependent, a function of the logic and the external
I/O. Active power dissipation results from charging internal
chip capacitances of the interconnect, unprogrammed
antifuses, module inputs, and module outputs, plus external
capacitance due to PC board traces and load device inputs.
An additional component of the active power dissipation is
the totem-pole current in CMOS transistor pairs. The net
effect can be associated with an equivalent capacitance that
can be combined with frequency and voltage to represent
active power dissipation.
Equivalent Capacitance
The power dissipated by a CMOS circuit can be expressed by
the Equation 2.
Power (uW) = CEQ * VCC
2 * F
(2)
Where:
CEQ is the equivalent capacitance expressed in pF.
VCC is the power supply in volts.
F is the switching frequency in MHz.
Equivalent capacitance is calculated by measuring ICCactive
at a specified frequency and voltage for each circuit
component of interest. Measurements have been made over a
range of frequencies at a fixed value of VCC. Equivalent
capacitance is frequency independent so that the results may
be used over a wide range of operating conditions. Equivalent
capacitance values are shown below.
CEQ Values for Actel FPGAs
To calculate the active power dissipated from the complete
design, the switching frequency of each part of the logic must
be known. Equation 3 shows a piece-wise linear summation
over all components.
Power =VCC2 * [(m * CEQM* fm)modules + (n * CEQI* fn)inputs
+ (p * (CEQO+ CL) * fp)outputs
+ 0.5 * (q1 * CEQCR * fq1)routed_Clk1 + (r1 * fq1)routed_Clk1
+ 0.5 * (q2 * CEQCR * fq2)routed_Clk2
+ (r2 * fq2)routed_Clk2 + 0.5 * (s1 * CEQCD * fs1)dedicated_Clk
+ (s2 * CEQCI * fs2)IO_Clk]
(3)
Where:
Modules (CEQM)
6.7
Input Buffers (CEQI)
7.2
Output Buffers (CEQO)
10.4
Routed Array Clock Buffer Loads (CEQCR)
1.6
Dedicated Clock Buffer Loads (CEQCD)
0.7
I/O Clock Buffer Loads (CEQCI)
0.9
m
= Number of logic modules switching at fm
n
= Number of input buffers switching at fn
p
= Number of output buffers switching at fp
q1
= Number of clock loads on the first routed
array clock
q2
= Number of clock loads on the second routed
array clock
r1
= Fixed capacitance due to first routed array
clock
r2
= Fixed capacitance due to second routed array
clock
s1
= Fixed number of clock loads on the dedicated
array clock
s2
= Fixed number of clock loads on the dedicated
I/O clock
CEQM
= Equivalent capacitance of logic modules in pF
CEQI
= Equivalent capacitance of input buffers in pF
CEQO
= Equivalent capacitance of output buffers in
pF
CEQCR = Equivalent capacitance of routed array clock
in pF
CEQCD = Equivalent capacitance of dedicated array
clock in pF
CEQCI
= Equivalent capacitance of dedicated I/O clock
in pF
CL
= Output lead capacitance in pF
fm
= Average logic module switching rate in MHz
fn
= Average input buffer switching rate in MHz
fp
= Average output buffer switching rate in MHz
fq1
= Average first routed array clock rate in MHz
fq2
= Average second routed array clock rate in
MHz
fs1
= Average dedicated array clock rate in MHz
fs2
= Average dedicated I/O clock rate in MHz
相关PDF资料 |
PDF描述 |
|---|---|
| A1460A-3TQG176C | FPGA, 848 CLBS, 6000 GATES, 200 MHz, PQFP176 |
| A1460A-3TQG176I | FPGA, 848 CLBS, 6000 GATES, PQFP176 |
| A1460A-PQG160C | FPGA, 848 CLBS, 6000 GATES, 100 MHz, PQFP160 |
| A1460A-PQG160I | FPGA, 848 CLBS, 6000 GATES, PQFP160 |
| A1460A-PQG208C | FPGA, 848 CLBS, 6000 GATES, 100 MHz, PQFP208 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A1460A-3TQ176C | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Field Programmable Gate Array (FPGA) |
| A1460A-3TQ176I | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Field Programmable Gate Array (FPGA) |
| A1460AA-1BG208B | 制造商:ACTEL 制造商全称:Actel Corporation 功能描述:Accelerator Series FPGAs - ACT 3Family |
| A1460AA-1BG208C | 制造商:ACTEL 制造商全称:Actel Corporation 功能描述:Accelerator Series FPGAs - ACT 3Family |
| A1460AA-1BG208I | 制造商:ACTEL 制造商全称:Actel Corporation 功能描述:Accelerator Series FPGAs - ACT 3Family |
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