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7.6.7ResetElectricalData/Timing
TMS320C6454
Fixed-PointDigitalSignalProcessor
SPRS311A–APRIL2006–REVISEDDECEMBER2006
NOTE
Ifaconfigurationpinmustberoutedoutfromthedeviceand3-stated(notdriven),the
internalpullup/pulldown(IPU/IPD)resistorshouldnotbereliedupon;TIrecommendsthe
useofanexternalpullup/pulldownresistor.Formoredetailedinformationon
pullup/pulldownresistorsandsituationswhereexternalpullup/pulldownresistorsare
required,seeSection3.7,Pullup/PulldownResistors.
Table7-14.TimingRequirementsforReset
(1)(2)(3)
(seeFigure7-8andFigure7-9)
-720
-850
NO.UNIT
-1000
MINMAX
5t
w(POR)
Pulseduration,PORlow256D
(4)
ns
6t
w(RESET)
Pulseduration,RESETlow24Cns
Setuptime,bootmodeandconfigurationpinsvalidbeforePORhighor
7t
su(boot)
6Pns
RESEThigh
(5)
Holdtime,bootmodeandconfigurationpinsvalidafterPORhighor
8t
h(boot)
6Pns
RESEThigh
(5)
(1)C=1/CLKIN1clockfrequencyinns.
(2)D=1/CLKIN2clockfrequencyinns.
(3)P=1/CPUclockfrequencyinnanoseconds(ns).Notethatafterpower-onresetandwarmresettheCPUfrequencyisequaltothe
CLKIN1frequencydividedbythreeduetothePLL1controllerbeingreset(seeSection7.6,ResetController).
(4)IfCLKIN2isnotused,t
w(POR)
mustbemeasuredintermsofCLKIN1cycles;otherwise,useCLKIN2cycles.
(5)AEA[19:0],ABA[1:0],andPCI_ENarethebootconfigurationpinsduringdevicereset.
Table7-15.SwitchingCharacteristicsOverRecommendedOperatingConditionsDuringReset
(1)
(seeFigure7-9)
-720
-850
NO.PARAMETERUNIT
-1000
MINMAX
9t
d(PORH-RSTATH)
Delaytime,PORhighANDRESEThightoRESETSTAThigh15000Cns
(1)C=1/CLKIN1clockfrequencyinns.
ForFigure7-8,notethefollowing:
•Zgroupconsistsof:allI/O/ZandO/Zpins,exceptforLowandHighgrouppins.Pinsbecomehigh
impedanceassoonastheirrespectivepowersupplyhasreachednormaloperatingcoditions.Pins
remaininhighimpedanceuntilconfiguredotherwisebytheirrespectiveperipheral.
•Lowgroupconsistsof:MTXD0/RMTXD0,MTXD1/RMTXD1,MTXD2/RMTXD2,MTXD3/RMTXD3,
MTXD4/RMTXD4,MTXEN/RMTXEN,andABUSREQ.Pinsbecomelowassoonastheirrespective
powersupplyhasreachednormaloperatingconditions.Pinsremainlowuntilconfiguredotherwiseby
theirrespectiveperipheral.
•Highgroupconsistsof:AHOLDandHRDY/PIRDY.Pinsbecomehighassoonastheirrespective
powersupplyhasreachednormaloperatingconditions.Pinsremainhighuntilconfiguredotherwiseby
theirrespectiveperipheral.
•AllperipheralsmustbeenablethroughsoftwarefollowingaPower-onReset;formoredetails,see
Section7.6.1,Power-onReset.
•Forpower-supplysequencerequirements,seeSection7.3.1,Power-SupplySequencing.
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