參數(shù)資料
型號： MPC8275VRMIBA
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 66.67 MHz, RISC PROCESSOR, PBGA516
封裝： 27 X 27 MM, 1 MM PITCH, LEAD FREE, PLASTIC, FBGA-516
文件頁數(shù)： 73/156頁
文件大?。?/td> 1680K
代理商： MPC8275VRMIBA
MOTOROLA
MPC8280 PowerQUICC II Family Hardware Specications
23
Clock Conguration Modes
Figure 12 is a representation of the information in Table 13.
Figure 12. Internal Tick Spacing for Memory Controller Signals
NOTE
The UPM machine outputs change on the internal tick determined by the
memory controller programming; the AC specications are relative to the
internal tick. Note that SDRAM and GPCM machine outputs change on
CLKin’s rising edge.
7
Clock Conguration Modes
The MPC8280 has 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.
Table 13. Tick Spacing for Memory Controller Signals
PLL Clock Ratio
Tick Spacing (T1 Occurs at the Rising Edge of CLKin)
T2
T3
T4
1:2, 1:3, 1:4, 1:5, 1:6
1/4 CLKin
1/2 CLKin
3/4 CLKin
1:2.5
3/10 CLKin
1/2 CLKin
8/10 CLKin
1:3.5
4/14 CLKin
1/2 CLKin
11/14 CLKin
Table 14. MPC8280 Clocking Modes
Pins
Clocking Mode
PCI Clock
Frequency Range
(MHZ)
Reference
PCI_MODE
PCI_CFG[0] PCI_MODCK1
1 Determines PCI clock frequency range. Refer to Sections 7.2 and 7.3.
1
—
Local bus
—
0
PCI host
50–66
0
1
25–50
0
1
0
PCI agent
50–66
0
1
25–50
CLKin
T1
T2
T3
T4
CLKin
T1
T2
T3
T4
for 1:2.5
for 1:3.5
CLKin
T1
T2
T3
T4
for 1:2, 1:3, 1:4, 1:5, 1:6
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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