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PM7366-PI Scheda tecnica(PDF) 77 Page - PMC-Sierra, Inc |
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PM7366-PI Scheda tecnica(HTML) 77 Page - PMC-Sierra, Inc |
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77 / 286 page  RELEASED PM7366 FREEDM-8 DATA SHEET PMC-1970930 ISSUE 4 FRAME ENGINE AND DATA LINK MANAGER PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 64 Transmit Descriptor Linking As described above, the TCDR table contains pointers which the TMAC uses to construct linked lists of data packets to be transmitted. After the host places a new TDR in the TDR Ready queue, the TMAC retrieves the TDR and links it to the TD pointed at by the Last TD Pointer field. The TMAC may create up to 256 linked lists, viz. a high-priority list and a low-priority list for each DMA channel. Whenever a new data packet is requested by the downstream block, the TMAC picks a packet from the high-priority linked list unless it is empty, in which case, a packet from the low- priority linked list is used. |
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