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PM3350-SW Datasheet(PDF) 70 Page - PMC-Sierra, Inc |
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PM3350-SW Datasheet(HTML) 70 Page - PMC-Sierra, Inc |
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70 / 224 page  ELAN 8X10 PM3350 ELAN 8 X10 DATA SHEET PMC-970109 ISSUE 3 8 PORT ETHERNET SWITCH PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND PMC-SIERRA, INC. CUSTOMERS ONLY 68 control is set to the default of zero, indicating no byte swap, the packet buffers have the following format (where 'N' is the total size of the packet buffer in bytes): 31 24 23 16 15 8 7 0 Byte Offset Size NextPB 0 LastSize RefCount unused, reserved 4 PayloadByte0 PayloadByte1 PayloadByte2 PayloadByte3 8 PayloadByte4 PayloadByte5 PayloadByte6 PayloadByte7 12 .... .... PayloadByte(n-4) PayloadByte(n-3) PayloadByte(n-2) PayloadByte(n-1) (N-4) If the MAC channel is set up to swap the incoming frame bytes, then the payload field of the packet buffers will be byte-swapped, but the headers will be left unchanged, as shown below: 31 24 23 16 15 8 7 0 Byte Offset Size NextPB 0 LastSize RefCount unused, reserved 4 PayloadByte3 PayloadByte2 PayloadByte1 PayloadByte1 8 PayloadByte7 PayloadByte6 PayloadByte5 PayloadByte4 12 .... .... PayloadByte(n-1) PayloadByte(n-2) PayloadByte(n-3) PayloadByte(n-4) (N-4) NextPB: 24-bit pointer to next packet buffer in linked-list of packet buffers constituting a frame. If no next packet buffer exists (i.e., this is the tail of the linked-list), then this field is NULL (all-zeros). Size: 8-bit size of packet buffer payload (excludes the 8-byte header), in bytes. RefCount: 8-bit reference count associated with packet: gives the number of queues that are pointing to this packet buffer. LastSize: 8-bit count of total number of valid bytes (including the 8-byte header) in the last packet buffer in the linked-list of buffers. Only valid if this is the first packet buffer in the linked-list, and there is more than one packet buffer in the linked-list. |
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