pxf4333 Infineon Technologies Corporation, pxf4333 Datasheet - Page 110

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

TstepC is configured per direction by the field TstepC[2:0] described in
DSCONF” on Page
following interpretation:
This renders Tstep in the range 1/2 ... 1/256.
Smaller values for TstepC and in consequence Tstep imply lower shaping rates.
Given a particular TP, the resulting PCR shaping rate is calculated as follows:
Vice versa, for a given PCR, the corresponding TP value is calculated as:
The value of parameter TP is constrained internally to:
Therefore, TP
Though possible to specify, very low values of TP do not make much sense, because
the shaper is limited by PCR
Equation (14)
The following special case must be considered:
TP = 0 disables the shaper, connecting the queue directly to the level 1 schedulers (RR
/ WFQ).
Data Sheet
PCR
Tstep
TP
TP
TP
max
this leads to the following constraint on TP:
≤
≥
=
R S
2
= 65472.
max 1 Tstep
16
=
SYSCLK
------------------------ -
=
2
–
246. Internally the shaper use a derived value Tstep with the
(
TstepC 8
SYSCLK
------------------------ -
2
32
6
,
32
–
×
RSmax
Tstep
×
×
128
Tstep
in any case (see
)
×
------------------- -
PCR
×
110
64
------- -
TP
64
RS
Equation
Operational Description
(12)). Together with
PXF 4333 V1.1
“USCONF/
2001-12-17
ABM-3G
(13)
(14)
(15)
(16)
(17)