參數(shù)資料
型號: TSPC750AMGS12LE
英文描述: Microprocessor
中文描述: 微處理器
文件頁數(shù): 32/44頁
文件大小: 870K
代理商: TSPC750AMGS12LE
32
TSPC750A/740A
2128A–HIREL–01/02
Note:
1. ThecoreandL2frequenciesareforreferenceonly.SomeconfigurationsmayselectcoreorL2frequencieswhicharenot
useful,notsupported,ornottestedforbytheTSPC750A;see“L2ClockACSpecifications,”forvalidL2CLKfrequencies.
TheL2CR[L2SL]bitshouldbesetforL2CLKfrequencieslessthan110MHz.
SystemDesign
Information
PLLPowerSupply
Filtering
TheAV
DD
andL2AV
DD
powersignalsareprovidedontheTSPC750Atoprovidepower
totheclockgenerationphase-lockedloopandL2cachedelay-lockedlooprespectively.
Toensurestabilityoftheinternalclock,thepowersuppliedtotheAV
DD
inputsignal
shouldbefilteredusingacircuitsimilartotheoneshowninFigure21.Thecircuitshould
beplacedascloseaspossibletotheAV
DD
pintoensureitfiltersoutasmuchnoiseas
possible.Anidenticalbutseparatecircuitshouldbeplacedascloseaspossibletothe
L2AV
DD
pin.
Figure21.
PLLPowerSupplyFilterCircuit
Decoupling
Recommendations
DuetotheTSPC750A’sdynamicpowermanagementfeature,largeaddressanddata
buses,andhighoperatingfrequencies,theTSPC750Acangeneratetransientpower
surgesandhighfrequencynoiseinitspowersupply,especiallywhiledrivinglarge
capacitiveloads.Thisnoisemustbepreventedfromreachingothercomponentsinthe
TSPC750Asystem,andtheTSPC750Aitselfrequiresaclean,tightlyregulatedsource
ofpower.Therefore,itisrecommendedthatthesystemdesignerplaceatleastone
decouplingcapacitorateachV
DD
andOV
DD
pin(andL2OV
DD
forthe360CBGA)ofthe
TSPC750A.Itisalsorecommendedthatthesedecouplingcapacitorsreceivetheir
powerfromseparateV
DD
,OV
DD
,andGNDpowerplanesinthePCB,utilizingshort
tracestominimizeinductance.
Table17.
SampleCore-to-L2Frequencies
CoreFrequencyinMHz
÷
1
÷
1.5
÷
2
÷
2.5
÷
3
200
200
133.3
100
80
-
208.3
208
138.6
104
83.3
-
210
210
140
105
84
-
220
220
146.6
110
88
-
225
225
150
112.5
90
-
233.3
233.3
155.5
116.6
93.3
-
240
240
160
120
96
80
266
266
177.3
133
106.4
88.6
VDD
10
10
μ
F
0.1
μ
F
AVDD (or L2AVDD)
GND
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