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5.10USB2.0
5.10.1USB2.0ElectricalData/Timing
TMS320DM355
DigitalMediaSystem-on-Chip(DMSoC)
SPRS463A–SEPTEMBER2007–REVISEDSEPTEMBER2007
DM355includesaUSBControllerModulethatisbuiltaroundtheMentorUSBMulti-PointHigh-Speed
DualRoleController,endpointmemory,CPPIDMAcontrollerandUTMI+PHY.Thecontrollerconformsto
USB2.0Specification.TheUSB2.0peripheralsupportsthefollowingfeatures:
•USB2.0peripheralatspeedshighspeed(HS:480Mb/s)andfullspeed(FS:12Mb/s)
•USB2.0hostatspeedsHS,FS,andlowspeed(LS:1.5Mb/s)
•Alltransfermodes(control,bulk,interrupt,andisochronous)
•FourTransmit(TX)andfourReceive(RX)endpointsinadditiontoendpoint0
•FIFORAM
–4Kendpoint
–ProgrammableFIFOsize
•ConnectstoastandardUTMI+PHYwitha60MHz,8-bitinterface
•IncludesaDMAsub-modulethatsupportsfourTXandfourRXchannelsofCPPI3.0DMAs
•RNDISmodeforacceleratingRNDIStypeprotocolsusingshortpacketterminationoverUSB
•USBOTGextensions,i.e.sessionrequestprotocol(SRP)andhostnegotiationprotocol(HNP)
TheUSB2.0peripheraldoesnotsupportthefollowingfeatures:
•On-chipchargepump
•HighbandwidthISOmodeisnotsupported(triplebuffering)
•16-bit30MHzUTMI+interfaceisnotsupported
•RNDISmodeaccelerationforUSBsizesthatarenotmultiplesof64bytes
•EndpointmaxUSBpacketsizesthatdonotconformtotheUSB2.0spec(forFS/LS:8,16,32,64,
and1023aredefined;forHS:64,128,512,and1024aredefined)
Table5-25.SwitchingCharacteristicsOverRecommendedOperatingConditionsforUSB2.0(see
Figure5-33)
DM355
LOWSPEEDFULLSPEEDHIGHSPEED
(1)
NO.PARAMETERUNIT
1.5Mbps12Mbps480Mbps
MINMAXMINMAXMINMAX
1t
r(D)
Risetime,USB_DPandUSB_DMsignals
(2)
753004200.5ns
2t
f(D)
Falltime,USB_DPandUSB_DMsignals
(2)
753004200.5ns
3t
frfm
Rise/Falltime,matching
(3)
8012590111.11%
4V
CRS
Outputsignalcross-overvoltage
(2)
1.321.32V
5t
jr(source)NT
Source(Host)Driverjitter,nexttransition22ns
t
jr(FUNC)NT
FunctionDriverjitter,nexttransition252ns
6t
jr(source)PT
Source(Host)Driverjitter,pairedtransition
(4)
11ns
t
jr(FUNC)PT
FunctionDriverjitter,pairedtransition101ns
7t
w(EOPT)
Pulseduration,EOPtransmitter12501500160175ns
8t
w(EOPR)
Pulseduration,EOPreceiver67082ns
9t
(DRATE)
DataRate1.512480Mb/s
10Z
DRV
DriverOutputResistance––2849.540.549.5Ω
(1)Formoredetailedspecificationinformation,seetheUniversalSerialBusSpecificationRevision2.0,Chapter7.Electrical.
(2)LowSpeed:C
L
=200pF,FullSpeed:C
L
=50pF,HighSpeed:C
L
=50pF
(3)t
frfm
=(t
r
/t
f
)x100.[ExcludingthefirsttransactionfromtheIdlestate.]
(4)t
jr
=t
px(1)
-t
px(0)
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