pxf4333 Infineon Technologies Corporation, pxf4333 Datasheet - Page 83
pxf4333
Manufacturer Part Number
pxf4333
Description
Abm 3g Atm Buf Fer Manager
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PXF4333.pdf
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Figure 3-27 Ideal ABM-3G Shaper Output
The implementation of the combined shaper guarantees sending the MBS as fast as
possible without exceeding the PCR.
If several cell streams are shaped simultaneously, it may happen that cells from different
shapers would have to be sent out at the same cell slot. If N cell streams are shaped, in
rare cases, a cell may have to wait up to N-1 cell cycles for transmission. This temporary
loss of rate is compensated for by slightly stretching the burst in time.
The additional CDV introduced to the PCR by this effect is monitored. With parameter
CDVMax an upper limit on the CDV than can occur without notice is programmed. If this
value is exceeded, an interrupt is generated.
details.
The difference between ideal and real shaper output is shown in
Figure 3-28 Ideal and Real ABM-3G Shaper Output
Data Sheet
PCR
SCR
PCR
SCR
rate
rate
Input Burst
MBS
Ideal
time
time
PCR
SCR
83
“UCDV/DCDV” on Page 239
PCR
SCR
rate
Leaky Bucket Shaper Output
rate
MBS
Average rate ≤ PCR
MBS
Real
Functional Description
Figure 3-28
Average rate = SCR
PXF 4333 V1.1
provides the
2001-12-17
ABM-3G
time
time
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