pxf4333 Infineon Technologies Corporation, pxf4333 Datasheet - Page 114

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

4.2.2.7
The total WFQ scheduler rate is calculated as follows:
with CCR
being the effective cell rate of the high priority RR scheduler in the SB.
GCR
T
The guaranteed cell rate for connection i is calculated according to:
with T
Therefore, T
The minimum guaranteed cell rate at a given GCR
Assuming a fixed given GCR
T
The integer function in equation above selects the next smaller value of the integer T
that is to say, the weight factor is higher than required and, thus, the queue is served
slightly faster in order to guarantee the rate.
Two special cases must be considered:
T
T
T
DQPT2T1” on Page
Data Sheet
WFQ
WFQ
WFQ
WFQ
WFQ
WFQ
.
can be calculated as:
= 0 is used to assign the queue to the high priority round robin scheduler.
= 16383 is used to assign the queue to the low priority round robin scheduler.
is referred to as parameter WFQFactor in the register description
WFQ
is distributed to the queues in proportion to the queue’s relative weight factor 1/
SB
constrained internally to:
GCR
Guaranteed Cell Rates and WFQ Weight Factors
GCR
T
T
GCR
WFQmax
being the configured SB rate as defined in
WFQ
WFQ
WFQ
i
min
=
≤
=
2
= 16320.
------------------------------------------------------------------------------------------------- -
T
14
GCR
----------------------------------------------------- -
254.
=
=
WFQ i ( )
–
GCR
-------------------------
T
CCR
2
WF Qmax
min
6
GCR
×
min
WFQ
SB
×
∀
, then for any given GCR >= GCR
T
k
–
WFQmax
∈
ECR
GCR
Active Queues
å
RT SB
WFQ
114
(
)
1 T
⁄
WFQ
WFQ k ( )
is therefore:
Section 4.2.2.2
Operational Description
min
the corresponding
PXF 4333 V1.1
and ECR
“UQPT2T1/
2001-12-17
ABM-3G
RT(SB)
WFQ
(24)
(25)
(26)
(27)
(28)
,