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PM9313 Datasheet(PDF) 59 Page - PMC-Sierra, Inc |
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PM9313 Datasheet(HTML) 59 Page - PMC-Sierra, Inc |
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59 / 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 55 PMC-Sierra, Inc. Figure 26. The Queueing Structure Figure 26 also highlights some important points with respect to the TDM service: • The linecard may also require a TDM ingress and egress queue. Unless the arrival of TDM cells at the linecard is synchronized with the start of the TDM Frame, the linecard will need to buffer those cells until the appropriate time. • There is no backpressure from the ETT1 egress TDM queue. Backpressure is not meaningful for a TDM service within the ETT1 core. The egress linecard must accept TDM cells that are sent to it (or else discard them). • The normal LCS credit mechanism is used for ingress TDM cells. 1.5.2 TDM Reservation Tables The TDM service operates by enabling ports to reserve bandwidth through the ETT1 crossbar at specific times. Each port has two logically separate tables; one for sending and one for receiving TDM cells. The Send and Receive tables are physically implemented in a single table called the TDM table. This TDM table has 1,024 entries, although fewer entries can be used if the Frame length is less than 1024. Each entry is of the form shown in Table 2. Table 2. TDM Reservation Table Field Size (bits) Meaning Input VLD 1 1 if the input side TDM entry is valid Input Tag 10 Tag for incoming cells (TDM flow ID) Linecard Ingress ETT1 port Ingress ETT1 port Linecard Egress LCS credits ETT1 Core queues TDM Egress queue TDM TDM queue TDM queue |
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