參數(shù)資料
型號: MPC8275VR
廠商: Motorola, Inc.
英文描述: PowerQUICC II Family Hardware Specifications
中文描述: 的PowerQUICC II系列硬件規(guī)格
文件頁數(shù): 23/76頁
文件大?。?/td> 496K
代理商: MPC8275VR
MOTOROLA
MPC8280 PowerQUICC II Family Hardware Specifications
23
Clock Configuration 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 specifications are relative to the
internal tick. Note that SDRAM and GPCM machine outputs change on
CLKin’s rising edge.
7
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.
Clock Configuration Modes
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_MODCK
1
1
Determines PCI clock frequency range. Refer to Sections 7.2 and 7.3.
1
Local bus
Table 15
0
0
0
PCI host
50–66
Table 16
0
0
1
25–50
Table 17
0
1
0
PCI agent
50–66
Table 18
0
1
1
25–50
Table 19
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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