參數(shù)資料
型號(hào)： MPC8250AZUMHBC
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 X 37 MM, 1.70 MM HEIGHT, 1.27 MM PITCH, TBGA-480
文件頁數(shù)： 11/73頁
文件大?。?/td> 885K
代理商： MPC8250AZUMHBC
MOTOROLA
MPC8250 Hardware Specications
19
Clock Conguration Modes
1.3
Clock Conguration Modes
The MPC8250 has three clocking modes: local, PCI host, and PCI agent. The clocking mode is set according
to three input pins—PCI_MODE, PCI_CFG[0], PCI_MODCK—as shown in Table 12.
In each clocking mode, the conguration of bus, core, PCI, and CPM frequencies is determined by seven
bits during the power-up reset—three hardware conguration pins (MODCK[1–3]) and four bits from
hardware conguration word[28–31] (MODCK_H). Both the PLLs and the dividers are set according to the
selected MPC8250 clock operation mode as described in the following sections.
NOTE
Clock congurations change only after POR is asserted.
1.3.1
Local Bus Mode
Table 13 shows the eight basic clock congurations for the MPC8250. Another 49 congurations are
available by using the conguration pin (RSTCONF) and driving four pins on the data bus.
Table 14 describes all possible clock congurations when using the hard reset conguration sequence.
Note also that basic modes are shown in boldface type. 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 12. MPC8250 Clocking Modes
Pins
Clocking Mode
PCI Clock
Frequency Range
(MHZ)
Reference
PCI_MODE
PCI_CFG[0] PCI_MODCK1
1 Determines PCI clock frequency range. Refer to Section 1.3.2, “PCI Mode.”
1
—
Local bus
—
00
0
PCI host
50–66
0
1
25–50
01
0
PCI agent
50–66
0
1
25–50
Table 13. Clock Default Congurations
MODCK[1–3]
Input Clock
Frequency
CPM Multiplication
Factor
CPM
Frequency
Core Multiplication
Factor
Core
Frequency
000
33 MHz
3
100 MHz
4
133 MHz
001
33 MHz
3
100 MHz
5
166 MHz
010
33 MHz
4
133 MHz
4
133 MHz
011
33 MHz
4
133 MHz
5
166 MHz
100
66 MHz
2
133 MHz
2.5
166 MHz
101
66 MHz
2
133 MHz
3
200 MHz
110
66 MHz
2.5
166 MHz
2.5
166 MHz
111
66 MHz
2.5
166 MHz
3
200 MHz
相關(guān)PDF資料
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