Released
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
Data Sheet
PMC-2000164
ISSUE 3
ENHANCED TT1™ SWITCH FABRIC
Figure 15. Sequence of Events at the Input Side
EPP
OC-48c 0 Virtual Output Queues
0,0
0,1
0,2
0,3
0,0
2
Crossbar
0,1
OC-48c
0
0,2
3
linecard
Scheduler
0.3
7
Initial state. Subport 0 has no outstanding requests for output (0,1)
EPP
OC-48c 0 Virtual Output Queues
0,0
2
0,0
0,1
0,2
0,3
Crossbar
Request (0,1)
OC-48c
linecard
0,1
1
0,2
3
Scheduler
0.3
7
Subport 0 issues a request to send a cell to output (0,1).
The request count for output (0,1) is incremented.
EPP
OC-48c 0 Virtual Output Queues
0,0
2
0,0
0,1
0,2
0,3
Crossbar
OC-48c
linecard
0,1
Grant (0,1)
1
0,2
3
LCS
Grant
Manager
Scheduler
0.3
7
The LCS Grant Manager issues a grant for queue (0,1) to subport 0.
40
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
PMC [ PMC-SIERRA, INC ]
