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參數(shù)資料
| 型號： | MPC8272 |
| 廠商： | Motorola, Inc. |
| 英文描述： | MPC8272 PowerQUICC II Family Hardware Specifications |
| 中文描述： | MPC8272的PowerQUICC II系列硬件規(guī)格 |
| 文件頁數(shù)： | 22/56頁 |
| 文件大?。?/td> | 1090K |
| 代理商： | MPC8272 |
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22
MPC8272 PowerQUICC II Family Hardware Specifications
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Clock Configuration Modes
7
As shown in Table 14, the clocking mode is set according to two sources:
Clock Configuration Modes
PCI_CFG[0]— An input signal. Also defined as “PCI_HOST_EN.” Refer to the Chapter 6,
“External Signals,” and Chapter 9, “PCI Bridge,” in the
MPC8272 PowerQUICC II Family
Reference Manual
.
PCI_MODCK—Bit 27 in the Hard Reset Configuration Word. Refer to Chapter 5, “Reset,” in the
MPC8272 PowerQUICC II Family Reference Manual
.
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.
NOTE
Clock configurations change only after PORESET is asserted.
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.
7.1
PCI Host Mode
Table 15 and Table 16 show configurations for PCI host mode. The frequency values 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 that in PCI host mode the input
clock is the bus clock.
Table 14. MPC8272 Clocking Modes
Pins
Clocking Mode
PCI Clock Frequency
Range (MHZ)
Reference
PCI_CFG[0]
1
1
PCI_HOST_EN
2
Determines PCI clock frequency range.
PCI_MODCK
2
0
0
PCI host
50–66
Table 15
0
1
25–50
Table 16
1
0
PCI agent
50–66
Table 17
1
1
25–50
Table 18
F
Freescale Semiconductor, Inc.
n
.
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| MPC8272_06 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications |
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