pxf4336 Infineon Technologies Corporation, pxf4336 Datasheet - Page 81
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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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3.4.2
3.4.2.1
The basic function of the hierarchical Queue Scheduler (QS) is to properly allocate cell
transmission slots to scheduler blocks and within those to queues, enabling them to send
buffered cells. Thereby, the QS allocates the bandwidth resources needed to fulfill the
specific service guarantees of individual connections.
Internally, the QS functions are implemented by two basic building blocks: 128 identical
scheduler blocks (SB) and a subsequent round robin scheduler (SBS) as depicted in
Figure
refresh) and a Common Real-Time (CRT) queue which also has priority over the SBS,
are provided. These two queues are assumed to be rate limited.
Section 4.2.2.3
•
Figure 3-21 Functional Structure of the Hierarchical Queue Scheduler
In summary, the Queue Scheduler calculates a QID for each cell emission opportunity.
Data Sheet
3-21. In addition to these, a prioritized empty cell generator queue (for SDRAM
Manager
Buffer
Queue Scheduler
Functional Overview
respectively provide the details on the programming of these queues.
Empty Cell Cycles
Common RT Queue
SB127
SB0
W
W
R
R
F
Q
R
R
R
R
F
Q
R
R
81
SBS
Functional Description
Section 4.2.2.4
UTOPIA
PXF 4336 V1.1
2001-12-17
ABM-P
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