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PM7326 Datasheet(PDF) 97 Page - PMC-Sierra, Inc

Part # PM7326
Description  ATM/PACKET TRAFFIC MANAGER AND SWITCH
PDF  238 Pages
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Manufacturer  PMC [PMC-Sierra, Inc]
Direct Link  http://www.pmc-sierra.com
Logo PMC - PMC-Sierra, Inc

PM7326 Datasheet(HTML) 97 Page - PMC-Sierra, Inc

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PM7326 S/UNI APEX
DATA SHEET
PMC-1981224
ISSUE 6
ATM/PACKET TRAFFIC MANAGER AND SWITCH
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
81
When in cell discard mode, the CLP state is defined by each cell, and the
decision to discard is evaluated upon receiving each cell. The minimum
resource counter VcCLP0Cnt increments/decrements based on the cell CLP
received/transmitted.
Non-user cells always have cell discard congestion rules applied, regardless of
the original VC’s congestion setting. Non-user cells do not have per-VC
congestion as the VcQCLP01Cnt is not active when a non-user cell is
encountered.
10.9.4.3
FCQ Discard
Figure 18
FCQ Discard Rules
ClassCLP1Thrsh
ClassCLP0Thrsh
ClassMaxThrsh
PortMaxThrsh
Per-Class
Per-Port
VcCLP1Thrsh
PortCLP1Thrsh
PortCLP0Thrsh
DirMaxThrsh
Per-Direction
DirCLP1Thrsh
DirCLP0Thrsh
Per-VC
VcCLP0Thrsh
invoke frame discard when
PortCnt >= PortMaxThrsh
invoke frame discard when
ClassCnt >= ClassMaxThrsh
invoke frame discard when
VcCnt >= VcCLP0Thrsh
No discard
Invoke frame discard
on CLP1 frame when
xxCnt >= xxCLP1Thrsh
Invoke frame discard
on CLP0, CLP1 frame when
xxCnt >= xxCLP0Thrsh
EXCEPT CLP0 frame having
VcCLP0Cnt < VcCLP0MinThrsh
invoke frame discard when
DirCnt >= DirMaxThrsh
invoke frame discard when FreeCnt = 0
Initial state of FreeCnt
Per-Device



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