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4.79TransmitEndpointFIFOSize(TXFIFOSZ)
4.80ReceiveEndpointFIFOSize(RXFIFOSZ)
Registers
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Section2.5describesdynamicallysettingendpointFIFOsizes.
TheTransmitEndpointFIFOSize(TXFIFOSZ)isshowninFigure94anddescribedinTable95.
Figure94.TransmitEndpointFIFOSize(TXFIFOSZ)
75430
ReservedDPBSZ
R-0R/W-0R-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table95.TransmitEndpointFIFOSize(TXFIFOSZ)FieldDescriptions
BitFieldValueDescription
7-5Reserved0Reserved
4DPBDoublepacketbufferingenable
0Singlepacketbufferingissupported
1Doublepacketbufferingisenabled
3-0SZ0-FhMaximumpacketsizetobeallowed(beforeanysplittingwithintheFIFOofBulkpacketspriorto
transmission).Ifm=SZ[3:0],theFIFOsizeiscalculatedas2
(m+3)
forsinglepacketbufferingand2
(m+4)
fordualpacketbuffering.
Section2.5describesdynamicallysettingendpointFIFOsizes.
TheReceiveEndpointFIFOSize(RXFIFOSZ)isshowninFigure95anddescribedinTable96.
Figure95.ReceiveEndpointFIFOSize(RXFIFOSZ)
75430
ReservedDPBSZ
R-0R/W-0R-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table96.ReceiveEndpointFIFOSize(RXFIFOSZ)FieldDescriptions
BitFieldValueDescription
7-5Reserved0Reserved
4DPBDoublepacketbufferingenable
0Singlepacketbufferingissupported
1Doublepacketbufferingisenabled
3-0SZ0-FhMaximumpacketsizetobeallowed(beforeanysplittingwithintheFIFOofBulkpacketspriorto
transmission).Ifm=SZ[3:0],theFIFOsizeiscalculatedas2
(m+3)
forsinglepacketbufferingand2
(m+4)
fordualpacketbuffering.
UniversalSerialBus(USB)Controller 138SPRUGH3–November2008
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