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3.6JTAGID(JTAGID)RegisterDescription
3.7Pullup/PulldownResistors
TMS320C6454
Fixed-PointDigitalSignalProcessor
SPRS311A–APRIL2006–REVISEDDECEMBER2006
Table3-13.DeviceStatusRegister(DEVSTAT)FieldDescriptions(continued)
BitFieldValueDescription
3:0BOOTMODE[3:0]Bootmodeconfigurationbits
Showsthestatusofwhatdevicebootmodeconfigurationisoperational.
BOOTMODE[3:0]
[Note:ifselectedforboot,thecorrespondingperipheralisautomaticallyenabledafterdevicereset.]
0000Noboot(defaultmode)
0001Hostboot(HPI)
0010Reserved
0011Reserved
0100EMIFA8-bitROMboot
0101MasterI2Cboot
0110SlaveI2Cboot
0111Hostboot(PCI)
1000Reserved
thru
1111
Formoredetailedinformationonthebootmodes,seeSection2.4,BootSequence.
TheJTAGIDregisterisaread-onlyregisterthatidentifiestothecustomertheJTAG/DeviceID.Forthe
C6454device,theJTAGIDregisterresidesataddresslocation0x02A80008.Fortheactualregisterbit
namesandtheirassociatedbitfielddescriptions,seeFigure3-11andTable3-14.
312827121110
VARIANTPARTNUMBERMANUFACTURER
LSB
(4-bit)(16-bit)(11-bit)
R-nR-0000000010001010b00000010111bR-1
LEGEND:R=Readonly;-n=valueafterreset
Figure3-11.JTAGID(JTAGID)Register-0x02A80008
Table3-14.JTAGID(JTAGID)RegisterFieldDescriptions
BitFieldValueDescription
31:28VARIANTVariant(4-Bit)value.Thevalueofthisfielddependsonthesiliconrevisionbeing
used.Formoreinformation,seetheTMS320C6455/54DigitalSignalProcessor
SiliconErrata(literaturenumberSPRZ234).
Note:theVARIANTfieldmaybeinvalidifnoCLKIN1signalisapplied.
27:12PARTNUMBERPartNumber(16-Bit)value.C6454value:0000000010001010b.
11:1MANUFACTURERManufacturer(11-Bit)value.C6454value:00000010111b.
0LSBLSB.Thisbitisreadasa"1"forC6454.
ProperboarddesignshouldensurethatinputpinstotheC6454devicealwaysbeatavalidlogicleveland
notfloating.Thismaybeachievedviapullup/pulldownresistors.TheC6454devicefeaturesinternalpullup
(IPU)andinternalpulldown(IPD)resistorsonmostpinstoeliminatetheneed,unlessotherwisenoted,for
externalpullup/pulldownresistors.
Anexternalpullup/pulldownresistorneedstobeusedinthefollowingsituations:
•DeviceConfigurationPins:Ifthepinisbothroutedoutand3-stated(notdriven),anexternal
pullup/pulldownresistormustbeused,eveniftheIPU/IPDmatchesthedesiredvalue/state.
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