參數(shù)資料
型號: PC8260MTPU150
廠商: Atmel Corp.
英文描述: PowerPC-based Communications Processors
中文描述: 基于PowerPC的通信處理器
文件頁數(shù): 44/53頁
文件大?。?/td> 364K
代理商: PC8260MTPU150
44
PC8260PowerQUICCII
2131B–HIREL–02/03
Figure12.
MEMCModeDiagram
Note:
Generally,allPC8260busandsystemoutputsignalsaredrivenfromtherisingedgeof
theinputclock(CLKin).Memorycontrollersignals,however,triggeronfourpointswithin
aCLKincycle.Eachcycleisdividedbyfourinternalticks:T1,T2,T3,andT4.T1always
occursattherisingedgeofCLKin(andT3atthefallingedge),butthespacingofT2and
T4dependsonthePLLclockratioselected,asshowninTable12.
Figure13.
InternalTickSpacingforMemoryControllerSignals
Note:
TheUPMmachineandGPCMmachineoutputschangeontheinternaltickdetermined
bythememorycontrollerprogramming.TheACspecificationsarerelativetotheinternal
tick.NotethatSDRAMmachineoutputschangeonlyontheCLKin’srisingedge.
Table12.
TickSpacingforMemoryControllerSignals
PLLClockRadio
TickSpacing(T1OccursattheRisingEdgeofCLKin)
T2
T3
T4
1:2,1:3,1:4,1:5,1:6
1/4CLKin
1/2CLKin
3/4CLKin
1:2.5
3/10CLKin
1/2CLKin
8/10CLKin
1:3.5
4/14CLKin
1/2CLKin
11/14CLKin
sp34/sp30
CLKin
V_CLK
Memory Controller Signals
T1
T2
T3
T4
T4
T3
T2
T1
for 1:2, 1:3, 1:4, 1:5, 1:6
for 1:2.5
for 1:3.5
T4
T3
T1
T2
CLKin
CLKin
CLKin
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