PXF4336 Datasheet, PDF (78/425 Pages) Infineon Technologies AG – ABM Premium ATM Buf fer Manager

ABM-P
PXF 4336 V1.1
Functional Description
ELSE
ExceedEpdCLP1
THEN DiscardPacket = TRUE
ELSE DiscardPacket = FALSE
Do nothing
IF
THEN
ELSE
EPDen AND UserToUserCell AND DiscardPacket
CellAcceptedByEPD = FALSE
CellAcceptedByEPD = TRUE
LastCellOfPacket = UserToUserCell AND EndOfPacket
3.4.1.7.3 PPD Algorithm
If the PPD algorithm is applied, the last cell of a corrupted packet should be accepted.
IF
THEN
IF
THEN
ELSE
PPDen AND UserToUserCell AND EndOfPacket
DiscardRestOfPacket = FALSE
PPDen AND UserToUserCell AND DiscardRestOfPacket
CellAcceptedByPPD = FALSE
CellAcceptedByPPD = TRUE
3.4.1.7.4 Hysteresis Algorithm
For any threshold TH:Delta(TH) = TH - TH/2**[DH + 1] with DH in 1..7
FillBelowHyst =
(ExceedMinBG = FALSE) OR (DH = 0) OR [
(BufferOccNg < Delta(BufMaxNg)) AND
((SBOccNg < Delta(SBMax)) OR (QID = 0)) AND
(TrafClassOccNg < Delta(TrafClassMax)) AND
(QueueLength >= Delta(QueueMax)) ]
IF
THEN
UserToUserCell AND (PPDen = FALSE) AND FillBelowHyst
DiscardRestOfPacket = FALSE
IF
THEN
ELSE
UserToUserCell AND (PPDen = FALSE) AND DiscardRestOfPacket
CellAcceptedByHyst = FALSE
CellAcceptedByHyst = TRUE
3.4.1.7.5 Overall Cell Acceptance Algorithm
The overall decision whether an arriving cell is buffered is based on the results of the
previous algorithms. The arriving cell can only be accepted if all algorithms would accept
the cell and if buffer space is available. To obtain the overall decision whether a correctly
received cell is finally buffered the following algorithm applies:
Data Sheet
78
2001-12-17