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4.37ReceiveCPPIDMAStateWord0(RCPPIDMASTATEW0)
4.38ReceiveCPPIDMAStateWord1(RCPPIDMASTATEW1)
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Registers
Table52.TransmitCPPICompletionPointer(TCPPICOMPPTR)FieldDescriptions
BitFieldValueDescription
31-2DESC_ADDR0-3FFFFFFFhDescriptorAddress
Thisfieldcontainsthe30-bitwordalignedpointeroftheendofpacketdescriptorthatthe
DMAhaslastprocessed
1Reserved0Reserved
0WRBK_MODEWriteback/CompareMode.Thisbitcontrolstheactionthatistobetakenwhenthislocation
iswritten.
0CompareMode.Indicatesthatthevaluethatispresentedonbits31:2ofthewritedata
shouldbecomparedagainstthevaluethatiscurrentlycontainedinbits31:2ofthislocation.
Ifthetwomatch,theinterruptbitcorrespondingtothisTxQueueshouldbedeasserted.
1WritebackMode.Indicatesthatthevaluethatispresentedonbits31:2ofthewritedata
shouldbewrittentothislocationandtheinterruptforthisTxQueueshouldbeasserted.This
bitisreadaszero.
TheReceiveCPPIDMAStateWord0(RCPPIDMASTATEW0)isshowninFigure52anddescribedin
Table53.
Figure52.ReceiveCPPIDMAStateWord0(RCPPIDMASTATEW0)
3116
Reserved
R-0
15870
ReservedSOP_BUFFER_OFFSET
R/W-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table53.ReceiveCPPIDMAStateWord0(RCPPIDMASTATEW0)FieldDescriptions
BitFieldValueDescription
31-8Reserved0-7FFFFFhReserved
7-0SOP_BUFFER_OFFSET0-FFhStartofPacketBufferOffset
ControlshowmanybytestheReceiveDMAwillskipatthebeginningofthestart
ofpacketbufferbeforebeginningtofillthebufferwithreceivedata.Thisfieldis
programmedbytheHostsoftwarewhenthechannelissetuptofacilitate
additionofvariousprotocolencapsulationheadersforretransmissionofreceived
packets.
TheReceiveCPPIDMAStateWord1(RCPPIDMASTATEW1)isshowninFigure53anddescribedin
Table54.
SPRUGH3–November2008UniversalSerialBus(USB)Controller105
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