Specifications
External Clock Operation
MOTOROLA
DSP56367
3-7
3.7
EXTERNAL CLOCK OPERATION
The DSP56367 system clock is an externally supplied square wave voltage source connected
to EXTAL(Figure 3-1).
Figure 3-1 E
xternal Clock Timing
Table 3-5 Clock Operation
No.
Characteristics
Symbol
Min
Max
1
Frequency of EXTAL (EXTAL Pin Frequency)
The rise and fall time of this external clock should be 3 ns
maximum.
Ef
0
120.0
2
EXTAL input high
1, 2
•
With PLL disabled (46.7%–53.3% duty
cycle
6
)
ET
H
3.89 ns
∞
•
With PLL enabled (42.5%–57.5% duty
cycle
6
)
3.54 ns
157.0
µ
s
3
EXTAL input low
1, 2
•
With PLL disabled (46.7%–53.3% duty
cycle
6
)
ET
L
3.89 ns
∞
•
With PLL enabled (42.5%–57.5% duty
cycle
6
)
3.54 ns
157.0
µ
s
4
EXTAL cycle time
2
•
With PLL disabled
ET
C
8.33 ns
∞
•
With PLL enabled
8.33 ns
273.1
µ
s
7
Instruction cycle time = I
CYC
= T
C
4
•
With PLL disabled
I
CYC
16.66 ns
∞
•
With PLL enabled
8.33 ns
8.53
µ
s
EXTAL
V
ILC
V
IHC
Midpoint
Note:
The midpoint is 0.5 (V
IHC
+ V
ILC
).
ET
H
ET
L
ET
C
3
4
2
Summary of Contents for DSP56367
Page 16: ...xvi MOTOROLA CONTENTS Paragraph Number Title Page Number ...
Page 22: ...xxii MOTOROLA List of Figures Figure Number Title Page Number ...
Page 26: ...xxvi MOTOROLA List of Tables Table Number Title Page Number ...
Page 148: ...4 6 DSP56367 MOTOROLA Design Considerations PLL Performance Issues ...
Page 248: ...9 30 DSP56367 MOTOROLA Serial Host Interface SHI Programming Considerations ...
Page 306: ...10 58 DSP56367 MOTOROLA Enhanced Serial Audio Interface ESAI ESAI Initialization Examples ...
Page 389: ...Bootstrap ROM Contents MOTOROLA DSP56367 A 15 end ...
Page 390: ...A 16 DSP56367 MOTOROLA Bootstrap ROM Contents ...
Page 432: ...C 8 DSP56367 MOTOROLA JTAG BSDL ...
Page 484: ...D 52 DSP56367 MOTOROLA Programmer s Reference ...
Page 490: ...E 6 DSP56367 MOTOROLA Power Consumption Benchmark ...
Page 516: ...F 26 DSP56367 MOTOROLA IBIS Model ...
Page 522: ...Index 6 MOTOROLA Index ...
Page 523: ......