pxf4336 Infineon Technologies Corporation, pxf4336 Datasheet - Page 144
pxf4336
Manufacturer Part Number
pxf4336
Description
Abm Premium Atm Buf Fer Manager
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PXF4336.pdf
(425 pages)
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Table 4-5
selected values of TstepC.
Table 4-5
desired
PCR
Regarding the inevitable jitter (CDV) produced by the rate shaper due to its limited
accuracy, it improves towards higher shaping rates and higher values of TstepC.
The value of parameter TP derived above is programmed into the field RateFactor in
register
Note: A value of 0 in field RateFactor disables both the PCR limiter and the leaky bucket
4.2.2.6
Regarding the Leaky Bucket Shaper, the formulas given previously in
apply accordingly when substituting SCR for PCR and TS for TP.
In addition, given MBS, the parameter tauS is calculated as:
with tauS constrained internally to:
Therefore, tauS
Data Sheet
shaper. Values other than 0 in field RateFactor are ignored for queues with an
additional leaky bucket shaper enabled. The parameter TP defined there
overrides. See
101957
353108
“UQPT2T0/DQPT2T0” on Page
shows the accuracy of the shaping rate at some characteristic rates for three
4830
Programming the Leaky Bucket Shaper
170
tauS
tauS
32
64
Shaper Accuracy as a Function of desired PCR and TstepC
max
TstepC = 0
≤
=
2
= 64512.
(
16
MBS 1
Section
–
2
0.000059
0.000138
0.000271
0.001774
0.006934
0.425621
10
–
)
4.2.2.6.
×
æ
è
TS TP
--------------------- -
acc
TstepC = 4
64
–
PCR
302.
144
at SYSCLK = 51.84 [MHz]
ö
ø
not possible
not possible
0.000009
0.000286
0.006934
0.034140
TstepC = 7
Operational Description
PXF 4336 V1.1
Section 4.2.2.5
not possible
not possible
not possible
0.000007
0.001081
0.001288
2001-12-17
ABM-P
(21)
(22)
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