www.德州仪器.com
TMS320VC5410A
fixed-pointdigitalsignalprocessor
SPRS139G–NOVEMBER2000–REVISEDJANUARY2005
table2-2.signaldescriptions(持续)
终端
i/o
(1)
描述
名字
CV
DD
S+V
DD
.dedicatedpowersupplyforthecorecpu
DV
SS
sground.dedicatedgroundfori/opins
DV
DD
S+V
DD
.dedicatedpowersupplyfori/opins
TESTPINS
ieeestandard1149.1testclock.tckisnormallyafree-runningclocksignalwitha50%dutycycle.这
changesontestaccessport(tap)ofinputsignalstmsandtdiareclockedintothetapcontroller,
TCK
(2)(4)
I
instructionregister,orselectedtestdataregisterontherisingedgeoftck.changesatthetapoutput
信号(tdo)occuronthefallingedgeoftck.
ieeestandard1149.1testdatainput.pinwithinternalpullupdevice.tdiisclockedintotheselected
TDI
(4)
I
寄存器(instructionordata)onarisingedgeoftck.
ieeestandard1149.1testdataoutput.thecontentsoftheselectedregister(instructionordata)是
tdoo/zshiftedoutoftdoonthefallingedgeoftck.tdoisinthehigh-impedancestateexceptwhenthe
scanningofdataisinprogress.tdoalsogoesintothehigh-impedancestatewhenoffislow.
ieeestandard1149.1testmodeselect.pinwithinternalpullupdevice.thisserialcontrolinputisclocked
TMS
(4)
I
intothetapcontrollerontherisingedgeoftck.
ieeestandard1149.1testreset.trst,whenhigh,givestheieeestandard1149.1scansystemcontrolof
TRST
(5)
itheoperationsofthedevice.iftrstisnotconnectedordrivenlow,thedeviceoperatesinitsfunctional
模式,andtheieeestandard1149.1signalsareignored.pinwithinternalpulldowndevice.
emulator0pin.whentrstisdrivenlow,emu0mustbehighforactivationoftheoffcondition.当
EMU0
(6)
i/o/ztrstisdrivenhigh,emu0isusedasaninterrupttoorfromtheemulatorsystemandisdefinedas
输入/outputbywayoftheieeestandard1149.1scansystem.
emulator1pin/disablealloutputs.whentrstisdrivenhigh,emu1/offisusedasaninterrupttoorfrom
theemulatorsystemandisdefinedasinput/outputbywayofieeestandard1149.1scansystem.当
trstisdrivenlow,emu1/offisconfiguredasoff.theemu1/offsignal,whenactivelow,putsall
outputdriversintothehigh-impedancestate.notethatoffisusedexclusivelyfortestingandemulation
emu1/止
(6)
i/o/z
目的(notformultiprocessingapplications).因此,fortheoffcondition,thefollowingapply:
•
trst=低,
•
EMU0=high
•
emu1/止=低
(6)thispinmustbepulledupwitha4.7-k
Ω
resistortoensurethedeviceisoperableinfunctionalmodeoremulationmode.
16
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