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参数资料
| 型号： | MPC8280CZQTX |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 400 MHz, RISC PROCESSOR, PBGA516 |
| 封装： | 27 X 27 MM, 2.25 MM, 1 MM PITCH, PLASTIC, BGA-516 |
| 文件页数： | 20/83页 |
| 文件大小： | 618K |
| 代理商： | MPC8280CZQTX |
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MPC8280 PowerQUICC II Family Hardware Specifications, Rev. 2
Freescale Semiconductor
27
Clock Configuration Modes
Within each mode, the configuration of bus, core, PCI, and CPM frequencies is determined by seven bits
during the power-on reset—three hardware configuration pins (MODCK[1–3]) and four bits from
hardware configuration word[28–31] (MODCK_H). Both the PLLs and the dividers are set according to
the selected clock operation mode as described in the following sections.
7.1
Local Bus Mode
This table lists clock configurations for the SoC in local bus mode. The frequencies listed are for the
purpose of illustration only. Users must select a mode and input bus frequency so that the resulting
configuration does not exceed the frequency rating of the user’s device.
NOTE
Clock configurations change only after PORESET is asserted.
Table 17. SoC Clocking Modes
Pins
Clocking Mode
PCI Clock
Frequency Range
(MHZ)
Reference
PCI_MODE
PCI_CFG[0] PCI_MODCK1
1 Determines PCI clock frequency range. See Section 7.2, “PCI Host Mode,” and Section 7.3, “PCI Agent Mode.”
1
—
Local bus
—
0
PCI host
50–66
0
1
25–50
0
1
0
PCI agent
50–66
0
1
25–50
Table 18. Clock Configurations for Local Bus Mode1
Mode2
Bus Clock3
(MHz)
CPM
Multiplication
Factor4
CPM Clock
(MHz)
CPU
Multiplication
Factor5
CPU Clock
(MHz)
MODCK_H-MODCK[1:3]
Low
High
Low
High
Low
High
Default Modes (MODCK_H= 0000)
0000_000
37.5
133.3
3
112.5
400.0
4
150.0
533.3
0000_001
33.3
133.3
3
100.0
400.0
5
166.7
666.7
0000_010
37.5
100.0
4
150.0
400.0
4
150.0
400.0
0000_011
30.0
100.0
4
120.0
400.0
5
150.0
500.0
0000_100
60.0
167.0
2
120.0
334.0
2.5
150.0
417.5
0000_101
50.0
167.0
2
100.0
334.0
3
150.0
501.0
0000_110
60.0
160.0
2.5
150.0
400.0
2.5
150.0
400.0
0000_111
50.0
160.0
2.5
125.0
400.0
3
150.0
480.0
Full Configuration Modes
0001_000
50.0
167.0
2
100.0
334.0
4
200.0
668.0
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