參數(shù)資料
型號： DSP56321
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
元件分類： 數(shù)字信號處理
英文描述： 24-Bit Digital Signal Processor
中文描述： 24位數(shù)字信號處理器
文件頁數(shù)： 24/84頁
文件大小： 898K
代理商： DSP56321
DSP56321 Technical Data, Rev. 11
2-4
Freescale Semiconductor
Specifications
2.4.2
External Clock Operation
The DSP56321 system clock is derived from the on-chip oscillator
or is externally supplied. To use the on-chip
oscillator, connect a crystal and associated resistor/capacitor components to EXTAL and XTAL; an example is
shown in
Figure 2-1
.
Internal clock low period
With DPLL disabled
With DPLL enabled
T
L
—
0.49
×
T
C
ET
C
—
—
0.51
×
T
C
Note:
Ef = External frequency; MF = Multiplication Factor = MFI + MFN/MFD; PDF = Predivision Factor;
DF = Division Factor; T
C
= Internal clock cycle; ET
C
= External clock cycle; T
H
= Internal clock high;
T
L
= Internal clock low
Figure 2-1.
Crystal Oscillator Circuits
Table 2-5.
External Clock Operation
No.
Characteristics
Symbol
200 MHz
220 MHz
240 MHz
275 MHz
Min
Max
Min
Max
Min
Max
Min
Max
1
Frequency of EXTAL
(EXTAL Pin Frequency)
1
With DPLL disabled
With DPLL enabled
2
Ef
DEFR = PDF
×
PDFR
0 MHz
16 MHz
200 MHz
200 MHz
0 MHz
16 MHz
220 MHz
220 MHz
0 MHz
16 MHz
240 MHz
240 MHz
0 MHz
16 MHz
275 MHz
275 MHz
2
EXTAL input high
3
With DPLL disabled
(46.7%–53.3% duty
cycle
4
)
With DPLL enabled
(42.5%–57.5% duty
cycle
4
)
ET
H
2.34 ns
2.13 ns
∞
35.9 ns
2.12 ns
1.93 ns
∞
35.9 ns
1.95 ns
1.77 ns
∞
35.9 ns
1.70 ns
1.55 ns
∞
35.9 ns
3
EXTAL input low
4
With DPLL disabled
(46.7%–53.3% duty
cycle
4
)
With DPLL enabled
(42.5%–57.5% duty
cycle
4
)
ET
L
2.34 ns
2.13 ns
∞
35.9 ns
2.12ns
1.93 ns
∞
35.9 ns
1.95 ns
1.77 ns
∞
35.9 ns
1.70 ns
1.55 ns
∞
35.9 ns
Table 2-4.
Internal Clocks (Continued)
Characteristics
Symbol
Expression
Min
Typ
Max
Suggested Component Values:
f
OSC
= 16–32 MHz
R = 1 M
±
10%
C = 10 pF
±
10%
Calculations are for a 16–32 MHz crystal with the following parameters:
shunt capacitance (C
0
) of 5.2–7.3 pF,
series resistance of 5–15
, and
drive level of 2 mW.
XTAL1
C
C
R
Fundamental Frequency
Crystal Oscillator
XTAL
EXTAL
Note:
Make sure that in the PCTL Register:
XTLD (bit 2) = 0
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