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PM9313 Datasheet(PDF) 43 Page - PMC-Sierra, Inc |
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PM9313 Datasheet(HTML) 43 Page - PMC-Sierra, Inc |
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43 / 343 page  PM9311/2/3/5 ETT1™ CHIP SET PMC-2000164 ISSUE 3 ENHANCED TT1™ SWITCH FABRIC Released Data Sheet PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 39 PMC-Sierra, Inc. The complete sequence of events at the input side is shown in Figure 15. 1. Linecard a issues a request to the EPP to send a cell to output channel (0,1). The initial request count is zero, so the arrival of the request then increments the request count to one. 2. The LCS Grant Manager sees that there is at least one empty cell buffer in the virtual output queue for output (0,1), and that the request counter for (0,1) is non-zero and so it decrements the request counter (back to zero) and issues a grant to the linecard. 3. The linecard then forwards the actual cell body to the EPP which stores the cell in the virtual output queue. The EPP also issues a request to the Scheduler, indicating that there is a cell waitingto be transferredtooutput (0). 4. Later the Scheduler issues a grant to the EPP which can forward the cell through the Crossbar to the output channel (the EPP at port 0). |
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