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PM3351-SW bảng dữ liệu(PDF) 87 Page - PMC-Sierra, Inc |
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PM3351-SW bảng dữ liệu(HTML) 87 Page - PMC-Sierra, Inc |
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87 / 268 page ![]() PM3351 ELAN 1X100 DATA SHEET PMC-970113 ISSUE 3 SINGLE PORT FAST ETHERNET SWITCH PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 81 DDRINGst Element 0 Element 1 Element 2 Transfer Ring 0 Element 3 . . Element (N-1) DDRINGst + 16*N Element 0 Element 1 Element 2 Transfer Ring 1 Element 3 . . Element (N-1) DDRINGst + 32*N . . . . DDRINGst + 112*N Element 0 Element 1 Element 2 Transfer Ring 7 Element 3 . . Element (N-1) Each transfer ring consists of N elements, where N is a power of 2. (The actual value of N is an implementation parameter, and is determined at system initialization time by configuration parameters in the boot image.) Each element in a transfer ring is formatted as a data descriptor structure; the NextDD field in each data descriptor is set up by the bootstrap firmware to point to the next consecutive element in the same transfer ring, with the last element in a transfer ring being set up to point back to the first. The elements in a given transfer ring therefore create a closed linked-list; if the NextDD pointers are followed starting from any element in the ring, the path followed will eventually return to the starting point. The remainder of the fields in each element (beyond the NextDD pointer) are left uninitialized at system startup. |
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