pxf4333 Infineon Technologies Corporation, pxf4333 Datasheet - Page 84

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

Table 3-29
Table 3-29
Parameter
TP
TS
tauS
VBR2.3
CDVMax
*) Refer to
granularities.
3.4.2.4.3 Shaping for VBR conformance
The standards define three conformance definitions for rt-VBR and nrt-VBR, referred to
as VBR.1, VBR.2 and VBR.3.
VBR conformance definitions in terms of the relevant cell stream: index 0+1 denotes
both CLP=0 and CLP=1 cells while index 0 denotes CLP=0 cells only.
Table 3-30
VBR.1
VBR.2
VBR.3
Hence, from a shaping perspective, there is no difference between VBR.2 and VBR.3.
As a consequence, the leaky bucket shaper in the ABM-3G is configurable on a per
queue basis to shape either the CLP=0+1 cell stream (config parameter VBR2,3 = 0) or
alternatively the CLP=0 cell stream only (config parameter VBR2,3 = 1). The PCR limiter
always shapes the CLP=0+1 cell stream.
By enabling a Leaky Bucket Shaper with the parameters TP=1/PCR, TS=1/SCR, tau =
BT and VBR2,3 = (0|1), the ABM-3G can be used to produce conforming VBR traffic.
Data Sheet
summarizes the parameters needed for combined PCR and SCR shaping.
Table
Summary of VBR Shaping Parameters
VBR Conformance Definitions
Derived
from
1/PCR
1/SCR
MBS or
BT
PCR Conformance
GCRA(PCR
GCRA(PCR
GCRA(PCR
4.2.2.5f for an explanation of shaper parameter ranges and
Stored in
Table/
Register
AVT:TP
AVT:TS
AVT:tauS
AVT:Config
UCDV/DCDV
0+1
0+1
0+1
, CDVT
, CDVT
, CDVT
Table 3-30
PCR
PCR
PCR
)
)
)
84
explains the differences between the three
Range
16 bit
16 bit
16 bit
1 bit
8 bit
SCR Conformance
GCRA(SCR
GCRA(SCR
GCRA(SCR
non conforming CLP=0 cells may be
tagged (CLP set to 1)
Min.
Value
*)
*)
0
0
16 cell
cycles
0+1
0
0
, BT)
, BT),
Functional Description
, BT)
Max Value
64511
1
255 x 16 cell
cycles
PXF 4333 V1.1
65471
65471
2001-12-17
ABM-3G