参数资料
型号: MPC8250AZQPIBX
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 300 MHz, RISC PROCESSOR, PBGA516
封装: 27 X 27 MM, 2.25 MM HEIGHT, 1 MM PITCH, PLASTIC, BGA-516
文件页数: 20/62页
文件大小: 945K
代理商: MPC8250AZQPIBX
MPC8250 Hardware Specifications, Rev. 2
Freescale Semiconductor
27
Clock Configuration Modes
Table 18 describes all possible clock configurations when using the MPC8250’s internal PCI bridge in
agent mode.
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
1
Assumes MODCK_HI = 0000.
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
3
Core frequency = (60x bus frequency)(core multiplication factor)
4
Bus frequency = CPM frequency / bus division factor
Table 18. Clock Configuration Modes in PCI Agent Mode
MODCK_H
MODCK[1–
3]
Input Clock
Frequency
(PCI) 1, 2
CPM
Multiplication
Factor1
CPM
Frequency
Core
Multiplication
Factor
Core
Frequency3
Bus Division
Factor
60x Bus
Frequency4
0001_001
66/33 MHz
2/4
133 MHz
5
166 MHz
4
33 MHz
0001_010
66/33 MHz
2/4
133 MHz
6
200 MHz
4
33 MHz
0001_011
66/33 MHz
2/4
133 MHz
7
233 MHz
4
33 MHz
0001_100
66/33 MHz
2/4
133 MHz
8
266 MHz
4
33 MHz
0010_001
50/25 MHz
3/6
150 MHz
3
180 MHz
2.5
60 MHz
0010_010
50/25 MHz
3/6
150 MHz
3.5
210 MHz
2.5
60 MHz
0010_011
50/25 MHz
3/6
150 MHz
4
240 MHz
2.5
60 MHz
0010_100
50/25 MHz
3/6
150 MHz
4.5
270 MHz
2.5
60 MHz
0011_000
66/33 MHz
2/4
133 MHz
2.5
110MHz
3
44 MHz
0011_001
66/33 MHz
2/4
133 MHz
3
132 MHz
3
44 MHz
0011_010
66/33 MHz
2/4
133 MHz
3.5
154 MHz
3
44 MHz
0011_011
66/33 MHz
2/4
133 MHz
4
176MHz
3
44 MHz
0011_100
66/33 MHz
2/4
133 MHz
4.5
198 MHz
3
44 MHz
0100_000
66/33 MHz
3/6
200 MHz
2.5
166 MHz
3
66 MHz
0100_001
66/33 MHz
3/6
200 MHz
3
200 MHz
366 MHz
0100_010
66/33 MHz
3/6
200 MHz
3.5
233 MHz
366 MHz
Table 17. Clock Default Configurations in PCI Agent Mode (MODCK_HI = 0000)
MODCK[1–3]1
Input Clock
Frequency
(PCI)2
CPM
Multiplication
Factor 2
CPM
Frequency
Core
Multiplication
Factor
Core
Frequency 3
Bus Division
Factor
60x Bus
Frequency4
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