參數(shù)資料
型號(hào)： DSP56321VL275
廠(chǎng)商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
元件分類(lèi)： 數(shù)字信號(hào)處理
英文描述： 24-Bit Digital Signal Processor
中文描述： 24位數(shù)字信號(hào)處理器
文件頁(yè)數(shù)： 64/84頁(yè)
文件大?。?/td> 898K
代理商： DSP56321VL275
DSP56321 Technical Data, Rev. 11
4-4
Freescale Semiconductor
Design Considerations
Equation 4:
The maximum internal current (I
CCI
max) value reflects the typical possible switching of the internal buses on best-
case operation conditions—not necessarily a real application case. The typical internal current (I
CCItyp
) value
reflects the average switching of the internal buses on typical operating conditions.
Perform the following steps for applications that require very low current consumption:
1.
Set the EBD bit when you are not accessing external memory.
2.
Minimize external memory accesses, and use internal memory accesses.
3.
Minimize the number of pins that are switching.
4.
Minimize the capacitive load on the pins.
5.
Connect the unused inputs to pull-up or pull-down resistors.
6.
Disable unused peripherals.
7.
Disable unused pin activity (for example,
CLKOUT
,
XTAL
).
One way to evaluate power consumption is to use a current-per-MIPS measurement methodology to minimize
specific board effects (that is, to compensate for measured board current not caused by the DSP). A benchmark
power consumption test algorithm is listed in
Appendix A
. Use the test algorithm, specific test current
measurements, and the following equation to derive the current-per-MIPS value.
Equation 5:
Where:
I
typF2
I
typF1
F2
F1
=
=
=
=
current at F2
current at F1
high frequency (any specified operating frequency)
low frequency (any specified operating frequency lower than F2)
Note:
F1 should be significantly less than F2. For example, F2 could be 66 MHz and F1 could be 33 MHz. The
degree of difference between F1 and F2 determines the amount of precision with which the current rating
can be determined for an application.
4.4 Input (EXTAL) Jitter Requirements
The allowed jitter on the frequency of
EXTAL
is 0.5 percent. If the rate of change of the frequency of
EXTAL
is slow
(that is, it does not jump between the minimum and maximum values in one cycle) or the frequency of the jitter is
fast (that is, it does not stay at an extreme value for a long time), then the allowed jitter can be 2 percent. The phase
and frequency jitter performance results are valid only if the input jitter is less than the prescribed values.
I
50
10
12
–
×
3.3
×
33
×
10
6
×
5.48
mA
=
=
MIPS
I
MHz
I
typF2
I
typF1
–
(
)
F2
F1
–
(
)
=
=
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