dsp56004 Freescale Semiconductor, Inc, dsp56004 Datasheet - Page 29

• Manufacturer Part Number: dsp56004
• Description: Symphonytm Audio Dsp Family 24-bit Digital Signal Processors
• Manufacturer: Freescale Semiconductor, Inc

INTERNAL CLOCKS
EXTERNAL CLOCK (EXTAL PIN)
MOTOROLA
No.
• with PLL disabled
• with PLL enabled and MF
• with PLL enabled and MF > 4
• with PLL disabled
• with PLL enabled and MF
• with PLL enabled and MF > 4
Internal Operation Frequency
Internal Clock High Period
Internal Clock Low Period
Internal Clock Cycle Time
Instruction Cycle Time
2 External Clock Input Low—EXTAL Pin
1 External Clock Input High—EXTAL Pin
Frequency of External Clock (EXTAL Pin)
(46.7%–53.3% duty cycle)
(42.5%–57.5% duty cycle)
• with PLL disabled
(46.7%–53.3% duty cycle)
• with PLL enabled
(42.5%–57.5% duty cycle)
• with PLL disabled
• with PLL enabled
Characteristics
For each occurrence of T
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.
Characteristics
Freescale Semiconductor, Inc.
For More Information On This Product,
Table 2-5 External Clock (EXTAL Pin)
4
4
Go to: www.freescale.com
Table 2-4 Internal Clocks
H
DSP56004/D, Rev. 3
, T
Symbol
L
, T
1
I
ET
1
ET
T
CYC
T
T
f
H
C
C
L
H
L
Sym.
ET
ET
or I
Ef
H
L
cyc
Min
9.3
8.5
9.3
8.5
, substitute with the numbers in Table 2-4.
0
50 MHz
235500
235500
Max
Minimum
0.467
0.467
50
0.48
0.48
T
T
Min
T
T
7.1
6.4
7.1
6.4
C
C
0
C
C
(DF /MF) ET
66 MHz
Expression
235500
235500
2 T
Max
66
C
Min
5.8
5.2
5.8
5.2
0
C
Maximum
0.533
0.533
81 MHz
0.52
0.52
Internal Clocks
Specifications
235500
235500
Max
81
T
T
T
T
C
C
C
C
MHz
Unit
ns
ns
ns
ns
2-5