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PM73487 Datasheet(PDF) 41 Page - PMC-Sierra, Inc

Part # PM73487
Description  622 Mbps ATM Traffic Management Device
PDF  251 Pages
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Manufacturer  PMC [PMC-Sierra, Inc]
Direct Link  http://www.pmc-sierra.com
Logo PMC - PMC-Sierra, Inc

PM73487 Datasheet(HTML) 41 Page - PMC-Sierra, Inc

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PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
Released
Datasheet
29
2.5.4
Receive Congestion Management
The receive queue controller maintains current, congested, and maximum queue depth counts of
cells on a per-VC, per-SC, and per-device basis. Three congestion management algorithms are
available for use on a per-channel basis. In each channel’s RX_CH_CONFIG word (refer to
section 9.3.1.1 “RX_CH_CONFIG” starting on page 184) there are bits that enable EPD, CLP-
based discard, and EFCI. These may be used in combination. In addition, PTD is supported as a
mode of the EPD operation.
Figure 32. Receive Channel Ring after Channel_B is Served But It is Not Run-Limited
Figure 33. Receive Channel Ring After Channel_A Gets Cell Through Fabric and is Added to Ring
Figure 34. Receive Congestion Limits
Service Class (SC)
Current Channel
Previous
Channel_E
Channel_D
Channel_B
Channel_C
Service Class (SC)
Current Channel
Previous
Channel_D
Channel_B
Channel_A
Channel_C
Channel_E
Per Service
Class (SC)
Per Device (DIR)
•
Per Channel



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