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參數(shù)資料
| 型號： | MPC8247ZQ |
| 廠商： | Motorola, Inc. |
| 英文描述： | MPC8272 PowerQUICC II Family Hardware Specifications |
| 中文描述： | MPC8272的PowerQUICC II系列硬件規(guī)格 |
| 文件頁數(shù)： | 19/56頁 |
| 文件大小： | 539K |
| 代理商： | MPC8247ZQ |
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19
MPC8272 PowerQUICC II Family Hardware Specifications
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
AC Electrical Characteristics
6.2
SIU AC Characteristics
Table 11 lists SIU input characteristics.
NOTE: PCI AC Timing
The MPC8272 meets the timing requirements of
PCI Specification
Revision 2.2
. Refer to Section 7, “Clock Configuration Modes” and “Note:
Tval (Output Hold)” to determine if a specific clock configuration is
compliant.
Table 12 lists SIU output characteristics.
NOTE
Activating data pipelining (setting BR
x
[DR] in the memory controller)
improves the AC timing.
Figure 9 shows the interaction of several bus signals.
Table 11. AC Characteristics for SIU Inputs
1
1
Input specifications are measured from the 50% level of the signal to the 50% level of the rising edge of CLKIN. Timings
are measured at the pin.
Spec Number
Characteristic
Value (ns)
Setup
Hold
Setup
Hold
66
MHz
83
MHz
100
MHz
66
MHz
83
MHz
100
MHz
sp11
sp10
AACK/TA/TS/DBG/BG/BR
6
5
3.5
0.5
0.5
0.5
sp11a
sp10
ARTRY/ TEA
6
5
4
0.5
0.5
0.5
sp12
sp10
Data bus in normal mode
5
4
3.5
0.5
0.5
0.5
sp13
sp10
Data bus in pipeline mode
5
4
2.5
0.5
0.5
0.5
sp15
sp10
All other pins
5
4
3.5
0.5
0.5
0.5
Table 12. AC Characteristics for SIU Outputs
1
1
Output specifications are measured from the 50% level of the rising edge of CLKIN to the 50% level of the signal.
Timings are measured at the pin.
2
To achieve 1 ns of hold time at 66.67/83.33/100 MHZ, a minimum loading of 20 pF is required.
Spec Number
Characteristic
Value (ns)
Max
Min
Maximum Delay
Minimum Delay
66
MHz
83
MHz
100
MHz
66
MHz
83
MHz
100
MHz
sp31
sp30 PSDVAL/TEA/TA
7
6
5.5
1
1
1
sp32
sp30
ADD/ADD_atr./BADDR/CI/GBL/WT
8
6.5
5.5
1
1
1
sp33
sp30 Data bus
2
6.5
6.5
5.5
0.5
0.5
0.5
sp34
sp30
Memory controller signals/ALE
6
5.5
5.5
1
1
1
sp35
sp30
All other signals
6
5.5
5.5
1
1
1
F
Freescale Semiconductor, Inc.
n
.
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