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4.72ConfigurationDataRegister(CONFIGDATA)
Registers
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Table87.ReceiveIntervalRegister(Hostmodeonly)(HOST_RXINTERVAL)FieldDescriptions
BitFieldValueDescription
7-0POLINTVL_NAKLIMIT0-FFhForInterruptandIsochronoustransfers,definesthepollingintervalforthe
currently-selectedtransmitendpointForBulkendpoints,thisregistersetsthenumberof
frames/microframesafterwhichtheendpointshouldtimeoutonreceivingastreamofNAK
responses.ThereisatransmitIntervalregisterforeachconfiguredtransmitendpoint
(exceptEndpoint0).Ineachcasethevaluethatissetdefinesanumberof
frames/microframes(HighSpeedtransfers),asfollows:
TransferTypeSpeedValidvalues(m)Interpretation
InterruptLowSpeedorFullSpeed1-255Pollingintervalismframes
HighSpeed1-16Pollingintervalis2
(—1)
microframes
IsochronousFullSpeedorHighSpeed1-16Pollingintervalis2
(—1)
frames/microframes
BulkFullSpeedorHighSpeed2-16NAKLimitis2
(—1)
frames/microframes
Note:Avalueof0or1disablestheNAKtimeoutfunction
Theconfigurationdataregister(CONFIGDATA)isshowninFigure87anddescribedinTable88.
Figure87.ConfigurationDataRegister(CONFIGDATA)
76543210
MPRXEMPTXEBIGENDIANHBRXEHBTXEDYNFIFOSOFTCONEUTMIDATAWIDTH
R-0R-0R-0R-0R-0R-1R-1R-0
LEGEND:R=Readonly;-n=valueafterreset
Table88.ConfigurationDataRegister(CONFIGDATA)FieldDescriptions
BitFieldValueDescription
7MPRXEIndicatesautomaticamalgamationofbulkpackets.
0Automaticamalgamationofbulkpacketsisnotselected.
1Automaticamalgamationofbulkpacketsisselected.
6MPTXEIndicatesautomaticsplittingofbulkpackets.
0Automaticsplittingofbulkpacketsisnotselected.
1Automaticsplittingofbulkpacketsisselected.
5BIGENDIANIndicatesendianordering.
0Little-endianorderingisselected.
1Big-endianorderingisselected.
4HBRXEIndicateshigh-bandwidthRxISOendpointsupport.
0High-bandwidthRxISOendpointsupportisnotselected.
1High-bandwidthRxISOendpointsupportisselected.
3HBTXEIndicateshigh-bandwidthTxISOendpointsupport.
0High-bandwidthTxISOendpointsupportisnotselected.
1High-bandwidthTxISOendpointsupportisselected.
2DYNFIFOIndicatesdynamicFIFOsizing.
0DynamicFIFOsizingoptionisnotselected.
1DynamicFIFOsizingoptionisselected.
1SOFTCONEIndicatessoftconnect/disconnect.
0Softconnect/disconnectoptionisnotselected
1Softconnect/disconnectoptionisselected
0UTMIDATAWIDTHIndicatesselectedUTMIdatawidth.
08bits
116bits
UniversalSerialBus(USB)Controller 132SPRUGH3–November2008
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