參數(shù)資料
型號(hào)： MPC8270CVRMHBX
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 266 MHz, RISC PROCESSOR, PBGA516
封裝： 27 X 27 MM, 2.25 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-516
文件頁(yè)數(shù)： 32/80頁(yè)
文件大?。?/td> 536K
代理商： MPC8270CVRMHBX
MPC8280 PowerQUICC II Family Hardware Specifications, Rev. 1.8
38
Freescale Semiconductor
Clock Configuration Modes
1100_000
Reserved
1100_001
Reserved
1100_010
Reserved
1
The “l(fā)ow” values are the minimum allowable frequencies for a given clock mode. The minimum bus frequency in a table entry
guarantees only the required minimum CPU operating frequency. The “high” values are for the purpose of illustration only.
Users must select a mode and input bus frequency so that the resulting configuration does not violate the frequency rating of
the user’s device. The minimum CPM frequency is 120 MHz. Minimum CPU frequency is determined by the clock mode. For
modes with a CPU multiplication factor <= 3, the minimum CPU frequency is 150 MHz for commercial temperature devices and
175 MHz for extended temperature devices. For modes with a CPU multiplication factor >= 3.5: for Rev0.1 the minimum CPU
frequency is 250 MHz; for RevA or later the minimum CPU frequency is 150 MHz for commercial temperature devices and 175
MHz for extended temperature devices.
2
As shown in Table 15, PCI_MODCK determines the PCI clock frequency range. Refer to Table 20 for lower configurations.
3
MODCK_H = hard reset configuration word [28–31]. MODCK[1-3] = three hardware configuration pins.
4
CPM multiplication factor = CPM clock/PCI clock
5
CPU multiplication factor = Core PLL multiplication factor
Table 20. Clock Configurations for PCI Agent Mode (PCI_MODCK=1) 1, 2
Mode 3
PCI Clock
(MHz)
CPM
Multiplication
Factor 4
CPM Clock
(MHz)
CPU
Multiplication
Factor 5
CPU Clock
(MHz)
Bus
Division
Factor
Bus Clock
(MHz)
MODCK_H-
MODCK[1-3]
Low
High
Low
High
Low
High
Low
High
Default Modes (MODCK_H=0000)
0000_000
30.0
50.0
4
120.0 200.0
2.5
150.0 250.0
2
60.0
100.0
0000_001
25.0
50.0
4
100.0 200.0
3
150.0 300.0
2
50.0
100.0
0000_010
25.0
50.0
6
150.0 300.0
3
150.0 300.0
3
50.0
100.0
0000_011
25.0
50.0
6
150.0 300.0
4
200.0 400.0
3
50.0
100.0
0000_100
25.0
50.0
6
150.0 300.0
3
180.0 360.0
2.5
60.0
120.0
0000_101
25.0
50.0
6
150.0 300.0
3.5
210.0 420.0
2.5
60.0
120.0
0000_110
25.0
50.0
8
200.0 400.0
3.5
233.3 466.7
3
66.7
133.3
0000_111
25.0
50.0
8
200.0 400.0
3
240.0 480.0
2.5
80.0
160.0
Full Configuration Modes
0001_001
30.0
50.0
4
120.0 200.0
5
150.0 250.0
4
30.0
50.0
0001_010
25.0
50.0
4
100.0 200.0
6
150.0 300.0
4
25.0
50.0
0001_011
25.0
50.0
4
100.0 200.0
7
175.0 350.0
4
25.0
50.0
0001_100
25.0
50.0
4
100.0 200.0
8
200.0 400.0
4
25.0
50.0
Table 19. Clock Configurations for PCI Agent Mode (PCI_MODCK=0) 1, 2 (continued)
Mode 3
PCI Clock
(MHz)
CPM
Multiplication
Factor 4
CPM Clock
(MHz)
CPU
Multiplication
Factor 5
CPU Clock
(MHz)
Bus
Division
Factor
Bus Clock
(MHz)
MODCK_H-
MODCK[1-3]
Low
High
Low
High
Low
High
Low
High
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