參數(shù)資料
型號(hào)： MPC826XAVR
廠商： Motorola, Inc.
英文描述： Hardware Specifications
中文描述： 硬件規(guī)格
文件頁(yè)數(shù)： 23/48頁(yè)
文件大小： 662K
代理商： MPC826XAVR
MOTOROLA
MPC826xA (HiP4) Family Hardware Specifications
23
Clock Configuration Modes
1.3.2
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
Table 14.
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.
0111_111
66 MHz
3.5
233 MHz
2
133 MHz
1000_000
66 MHz
3.5
233 MHz
2.5
166 MHz
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
1
Because of speed dependencies, not all of the possible configurations in Table 13 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 14. MPC8265 and MPC8266 Clocking Modes
Pins
Clocking Mode
PCI Clock
Frequency Range
(MHZ)
PCI_MODE PCI_CFG[0] PCI_MODCK
1
—
—
Local bus
—
0
0
0
PCI host
50–66
0
0
1
25–50
0
1
0
PCI agent
50–66
0
1
1
25–50
Table 13. Clock Configuration Modes
1
(Continued)
MODCK_H–MODCK[1–3]
Input Clock
Frequency
2,3
CPM Multiplication
Factor
2
CPM
Frequency
2
Core Multiplication
Factor
2
Core
Frequency
2
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