參數(shù)資料
型號: MPC8250ACZUMHBB
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, PBGA480
封裝: 37.50 X 37.50 MM, TBGA-480
文件頁數(shù): 18/73頁
文件大?。?/td> 885K
代理商: MPC8250ACZUMHBB
MOTOROLA
MPC8250 Hardware Specications
25
Clock Conguration Modes
1.3.2.2
PCI Agent Mode
The frequencies listed are for the purpose of illustration only. Users must select a mode and input bus
frequency so that the resulting conguration does not exceed the frequency rating of the user’s device.
Table 18 describes all possible clock congurations when using the MPC8250’s internal PCI bridge in agent
mode.
1010_010
100 MHz
2
200 MHz
3
300 MHz
3/6
66/33 MHz
1010_011
100 MHz
2
200 MHz
3.5
350 MHz
3/6
66/33 MHz
1010_100
100 MHz
2
200 MHz
4
400 MHz
3/6
66/33 MHz
1011_000
100 MHz
2.5
250 MHz
2
200 MHz
4/8
62/31 MHz
1011_001
100 MHz
2.5
250 MHz
2.5
250 MHz
4/8
62/31MHz
1011_010
100 MHz
2.5
250 MHz
3
300 MHz
4/8
62/31 MHz
1011_011
100 MHz
2.5
250 MHz
3.5
350 MHz
4/8
62/31 MHz
1011_100
100 MHz
2.5
250 MHz
4
400 MHz
4/8
62/31 MHz
1 Input clock frequency is given only for the purpose of reference. User should set MODCK_H–MODCK_L so
that the resulting conguration does not exceed the frequency rating of the user’s part.
2 The frequency depends on the value of PCI_MODCK. If PCI_MODCK is high (logic ‘1’), the PCI frequency is
divided by 2 (33 instead of 66 MHz, etc.). Refer to Table 12
3 In this mode, PCI_MODCK must be “0”.
Table 17. Clock Default Congurations in PCI Agent Mode (MODCK_HI = 0000)
MODCK[1–3]1
1 Assumes MODCK_HI = 0000.
Input Clock
Frequency
CPM
Multiplication
Factor2
2 The frequency depends on the value of PCI_MODCK. If PCI_MODCK is high (logic ‘1’), the PCI frequency is
divided by 2 (33 instead of 66 MHz, etc.) and the CPM multiplication factor is multiplied by 2. Refer to Table 12
CPM
Frequency
Core
Multiplication
Factor
Core
Frequency3
3 Core frequency = (60x bus frequency)(core multiplication factor)
Bus Division
Factor
60x Bus
Frequency4
4 Bus frequency = CPM frequency / bus division factor
000
66/33 MHz
2/4
133 MHz
2.5
166 MHz
2
66 MHz
001
66/33 MHz
2/4
133 MHz
3
200 MHz
2
66 MHz
010
66/33 MHz
3/6
200 MHz
3
200 MHz
3
66 MHz
011
66/33 MHz
3/6
200 MHz
4
266 MHz
3
66 MHz
100
66/33 MHz
3/6
200 MHz
3
240 MHz
2.5
80 MHz
101
66/33 MHz
3/6
200 MHz
3.5
280 MHz
2.5
80 MHz
110
66/33 MHz
4/8
266 MHz
3.5
300 MHz
3
88 MHz
111
66/33 MHz
4/8
266 MHz
3
300 MHz
2.5
100 MHz
Table 16. Clock Conguration Modes in PCI Host Mode (Continued)
MODCK_H –
MODCK[1–3]
Input Clock
Frequency1
(Bus)
CPM
Multiplication
Factor
CPM
Frequency
Core
Multiplication
Factor
Core
Frequency
PCI Division
Factor2
PCI
Frequency2
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