參數(shù)資料
型號: DSP56004FJ81
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: SYMPHONY AUDIO DSP FAMILY 24-BIT DIGITAL SIGNAL PROCESSORS
中文描述: Symphony音頻DSP系列的24位數(shù)字信號處理器
文件頁數(shù): 29/82頁
文件大小: 636K
代理商: DSP56004FJ81
Specifications
Internal Clocks
MOTOROLA
DSP56004/D, Rev. 3
2-5
INTERNAL CLOCKS
For each occurrence of T
H
, T
L
, T
C
or I
cyc
, substitute with the numbers in
Table 2-4
.
EXTERNAL CLOCK (EXTAL PIN)
The DSP56004 system clock is externally supplied via the EXTAL pin. Timings shown
in this document are valid for clock rise and fall times of 3 ns maximum.
Table 2-4
Internal Clocks
Characteristics
Symbol
Expression
Minimum
Maximum
Internal Operation Frequency
f
Internal Clock High Period
with PLL disabled
with PLL enabled and MF
4
with PLL enabled and MF > 4
T
H
ET
H
0.48
×
T
C
0.467
×
T
C
0.52
×
T
C
0.533
×
T
C
Internal Clock Low Period
with PLL disabled
with PLL enabled and MF
4
with PLL enabled and MF > 4
T
L
ET
L
0.48
×
T
C
0.467
×
T
C
0.52
×
T
C
0.533
×
T
C
Internal Clock Cycle Time
T
C
I
CYC
(DF / MF)
×
ET
C
2
×
T
C
Instruction Cycle Time
Table 2-5
External Clock (EXTAL Pin)
No.
Characteristics
Sym.
50 MHz
66 MHz
81 MHz
Unit
Min
Max
Min
Max
Min
Max
Frequency of External Clock (EXTAL Pin)
External Clock Input High—EXTAL Pin
1
with PLL disabled
(46.7%–53.3% duty cycle)
with PLL enabled
(42.5%–57.5% duty cycle)
External Clock Input Low—EXTAL Pin
1
with PLL disabled
(46.7%–53.3% duty cycle)
with PLL enabled
(42.5%–57.5% duty cycle)
Ef
0
50
0
66
0
81
MHz
1
ET
H
9.3
8.5
235500
7.1
6.4
235500
5.8
5.2
235500
ns
ns
2
ET
L
9.3
8.5
235500
7.1
6.4
235500
5.8
5.2
235500
ns
ns
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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