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4.29ReceiveBufferCount3Register(RBUFCNT3)
4.30TransmitCPPIDMAStateWord0(TCPPIDMASTATEW0)
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Registers
TheReceiveBufferCount3Register(RBUFCNT3)isshowninFigure44anddescribedinTable45.
Figure44.ReceiveBufferCount3Register(RBUFCNT3)
3116
Reserved
R-0
150
BUFCNT
R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table45.ReceiveBufferCount3Register(RBUFCNT3)FieldDescriptions
BitFieldValueDescription
31-16Reserved0Reserved
15-0BUFCNT0-FFFFhReceiveCPPIBufferCount0
ThecurrentcountofCPPIbuffersinReceivechannel3queue.Writesaddtocurrentvalue(not
overwrite).TheDMArequiresaminimumof3RXbufferstooperate.
TheTransmitCPPIDMAStateWord0(TCPPIDMASTATEW0)isshowninFigure45anddescribedin
Table46.
Figure45.TransmitCPPIDMAStateWord0(TCPPIDMASTATEW0)
3116
TXQ_HEAD_PTR
R/W-0
15210
TXQ_HEAD_PTRReservedIN_PACKET
R/W-0R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table46.TransmitCPPIDMAStateWord0(TCPPIDMASTATEW0)FieldDescriptions
BitFieldValueDescription
31-2TXQ_HEAD_PTR0-3FFFFFFFhTXQueueHeadPointer
30-bitpointerto32-bitaligneddescriptorattheheadofthehighpriorityTXqueue
1Reserved0Reserved
0IN_PACKETFlagindicatingtheDMAisinthemiddleofprocessingapacket
0Notcurrentlyinpacket
1Currentlyinpacket
SPRUGH3–November2008UniversalSerialBus(USB)Controller101
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