參數(shù)資料
型號： VT6516
廠商： Electronic Theatre Controls, Inc.
英文描述： 16/12 PORT 10/1000 ASE T/TX
中文描述： 16/12港口10/1000日月光噸/德克薩斯州
文件頁數(shù)： 24/73頁
文件大小： 440K
代理商： VT6516
VIA Technologies, Inc.
Preliminary VT6516 Datarsheet
-
24-
3.1.1 SDRAM interface
All frames received by the VT6516 will be stored into a common frame buffer memory, SDRAM.The
SDRAM contains the packet buffers, each buffer is a 1536 (1.5K) bytes memory block. Each block is
associated to an entry in link table in SRAM. The link entry includes a field (19 bits to support 512 MB) to
point to next link entry. The figure 3-2 is buffer link list structure.
In order to provide the cost effective DRAM buffers, user can connect the 32 bits data SGRAM with
VT6516 switch, there are two external buffer device using two double bank 128Kbits by 32 required. The
following figure shows the minimum configuration of buffer memory and link/address memory. Note that the
SGRAM physical memory hole is to accommodate the forwarding table into the SRAM link list hole.
VT6516
32*32 (128Kb)
SSRAM by one
128K*32*2
(2MB)
SGRAM by two
Memory Hole
(14MB)
Physical Device
(1MB)
Physical Device
(1MB)
Physical Buffer Memory
Allocation (eg, 2MB)
Address table
entries
(Link-List Hole)
Link List
Link List
Physical SRAM Memory
Allocation (eg, 128K)
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