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| 型号： | MPC8266ACVRIHBX |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 200 MHz, RISC PROCESSOR, PBGA516 |
| 封装： | PLASTIC, BGA-516 |
| 文件页数： | 19/52页 |
| 文件大小： | 884K |
| 代理商： | MPC8266ACVRIHBX |
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MPC8260A PowerQUICC II Integrated Communications Processor Hardware Specifications, Rev. 1.1
26
Freescale Semiconductor
Clock Configuration Modes
3.2
PCI Mode
The MPC8265 and the MPC8266 have 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
In addition, note the following:
NOTE: PCI_MODCK
In PCI mode only, PCI_MODCK comes from the LGPL5 pin and
MODCK_H[0–3] comes from {LGPL0, LGPL1, LGPL2, LGPL3}.
NOTE: Tval (Output Hold)
The minimum Tval = 2 when PCI_MODCK = 1, and the minimum Tval = 1
when PCI_MODCK = 0. Therefore, designers should use clock
configurations that fit this condition to achieve PCI-compliant AC timing.
NOTE
Clock configurations change only after POR is asserted.
1000_001
66 MHz
3.5
233 MHz
3
200 MHz
1000_010
66 MHz
3.5
233 MHz
3.5
233 MHz
1000_011
66 MHz
3.5
233 MHz
4
266 MHz
1000_100
66 MHz
3.5
233 MHz
4.5
300 MHz
Notes:
1. Because of speed dependencies, not all of the possible configurations in Table 14 are applicable.
2. The user should choose the input clock frequency and the multiplication factors such that the frequency of the CPU
is equal to or greater than150 MHz and the CPM ranges between 66–233 MHz.
3. Input clock frequency is given only for the purpose of reference. User should set MODCK_H–MODCK_L so that
the resulting configuration does not exceed the frequency rating of the user’s part.
Table 15. MPC8265 and MPC8266 Clocking Modes
Pins
Clocking Mode
PCI Clock
Frequency Range
(MHZ)
PCI_MODE
PCI_CFG[0]
PCI_MODCK
1
—
Local bus
—
0
PCI host
50–66
0
1
25–50
0
1
0
PCI agent
50–66
0
1
25–50
Table 14. Clock Configuration Modes(1) (continued)
MODCK_H–MODCK[1–3]
Input Clock
Frequency(2)
,(3)
CPM Multiplication
Factor2
CPM
Frequency2
Core Multiplication
Factor2
Core
Frequency2
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