pxf4333 Infineon Technologies Corporation, pxf4333 Datasheet - Page 70

• Manufacturer Part Number: pxf4333
• Description: Abm 3g Atm Buf Fer Manager
• Manufacturer: Infineon Technologies Corporation

stored without further checks, except the queue threshold checks. When the MinBG limit
is exceeded, the Cell Acceptance Algorithm checks if buffer space is available in the non
guaranteed buffer space.
Figure 3-18 Buffer Management with per Queue Minimum Buffer Reservation
For all traffic classes, the threshold BufMaxNg must be adjusted appropriately, such that,
if LQ is the set of logical queues allocated so far, then:
Although the ABM-3G in principle has the knowledge of all programmed guaranteed
minimum queue sizes, it does not perform the summation for complexity reasons.
Refer to
reservation thresholds. If the condition in the formula above is not fulfilled, then error
condition BCFGE occurs and is signalled in
Register 102 "ISRD" on Page 300
3.4.1.6.5 Hysteresis for Maximum Thresholds
Hysteresis is an optional feature for the maximum thresholds BufMaxNg, SBMax,
TrafClassMax, and QueueMax in cell discard mode. Hysteresis means that cell discard
starts when any of the maximum thresholds mentioned above (referred to as TH for
convenience) is exceeded and continues until the level falls below a threshold TL that is
considerably lower than TH.
Data Sheet
BufMax BufMaxNg
BufMax
BufMaxNg
BufEPD
BufferOccNg
–
Register 39 "QCT2" on Page 217
queues / connections
Reserved queue 1
Reserved queue 2
Reserved queue 3
≥
Part of Buffer
shared by all
∀
i
å
∈
LQ
MinBG
respectively.
i
QueueLimit
70
for the programming of minimum buffer
QueueMax
Register 101 "ISRU" on Page 297
Shared buffer
MinBG
Reserved buffer
QueueLength
Functional Description
PXF 4333 V1.1
Queue 1
Queue 2
Queue 3
2001-12-17
ABM-3G
or