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A1280DX-CQB 参数 Datasheet PDF下载

A1280DX-CQB图片预览
型号: A1280DX-CQB
PDF下载: 下载PDF文件 查看货源
内容描述: 集成系列FPGA : 1200XL和3200DX家庭 [Integrator Series FPGAs: 1200XL and 3200DX Families]
分类和应用:
文件页数/大小: 84 页 / 3116 K
品牌: ACTEL [ Actel Corporation ]
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Integrator Series FPGAs: 1200XL and 3200DX Families  
Equivalent Capacitance  
fp  
= Average output buffer switching rate in MHz  
= Average first routed array clock rate in MHz  
= Average second routed array clock rate in MHz  
The power dissipated by a CMOS circuit can be expressed by  
fq1  
Equation 1  
fq2  
Power (µW) = CEQ * VCC2 * F  
(1)  
Fixed Capacitance Values for Actel FPGAs  
(pF)  
where:  
CEQ is the equivalent capacitance expressed in picofarads  
(pF).  
Table 5.  
VCC is power supply in volts (V).  
r1  
routed_Clk1  
106  
r2  
routed_Clk2  
106  
Device Type  
A1225XL  
A1240XL  
A3265DX  
A1280XL  
A32100DX  
A32140DX  
A32200DX  
A32300DX  
F is the switching frequency in megahertz (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 the results may  
be used over a wide range of operating conditions.  
Equivalent capacitance values are shown below.  
134  
158  
168  
178  
190  
230  
285  
134  
158  
168  
178  
190  
230  
285  
C
Values for Actel FPGAs  
EQ  
Modules (CEQM  
Input Buffers (CEQI  
Output Buffers (CEQO  
Routed Array Clock Buffer Loads (CEQCR  
)
5.2  
11.6  
23.8  
3.5  
Determining Average Switching Frequency  
To determine the switching frequency for a design, the user  
must have a detailed understanding of the data input values  
to the circuit. The following guidelines represent worst-case  
scenarios; they can be generally used to predict the upper  
limits of power dissipation.  
)
)
)
To calculate the active power dissipated from the complete  
design, the switching frequency of each part of the logic  
must be known. Equation 2 shows a piece-wise linear  
summation over all components.  
Logic Modules (m)  
=
80% of  
Combinatorial  
Modules  
Power = VCC2 * [(m x CEQM * fm)Modules  
(n * CEQI * fn)Inputs + (p * (CEQO + CL) * fp)outputs  
0.5 * (q1 * CEQCR * fq1)routed_Clk1 + (r1 * fq1)routed_Clk1  
+
+
Inputs Switching (n)  
Outputs Switching (p)  
=
=
=
# of Inputs/4  
# Outputs/4  
+
0.5 * (q2 * CEQCR * fq2)routed_Clk2 + (r2 * fq2)routed_Clk2 (2)  
First Routed Array Clock Loads  
(q1)  
40% of Sequential  
Modules  
where:  
m
n
p
= Number of logic modules switching at frequency fm  
= Number of input buffers switching at frequency fn  
= Number of output buffers switching at frequency fp  
Second Routed Array Clock  
Loads (q2)  
=
40% of Sequential  
Modules  
Load Capacitance (CL)  
=
=
35 pF  
F/10  
q1  
= Number of clock loads on the first routed array  
clock  
Average Logic Module Switching  
Rate (fm)  
q2  
= Number of clock loads on the second routed array  
clock  
Average Input Switching Rate  
(fn)  
=
=
=
=
F/5  
F/10  
F
r1  
r2  
= lFixed capacitance due to first routed array clock  
= Fixed capacitance due to second routed array  
clock  
Average Output Switching Rate  
(fp)  
Average First Routed Array  
Clock Rate (fq1)  
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  
Average Second Routed Array  
Clock Rate (fq2)  
F/2  
CL  
fm  
fn  
= Output load capacitance in p  
= Average logic module switching rate in MHz  
= Average input buffer switching rate in MHz  
Discontinued – v3.0  
15  
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