VT6516 ETC, VT6516 Datasheet - Page 24

• Manufacturer Part Number: VT6516
• Description: 16/12 PORT 10/1000 ASE T/TX
• Manufacturer: ETC

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.
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.
SSRAM by one
3.1.1 SDRAM interface
32*32 (128Kb)
VT6516
All frames received by the VT6516 will be stored into a common frame buffer memory, SDRAM.The
In order to provide the cost effective DRAM buffers, user can connect the 32 bits data SGRAM with
VIA Technologies, Inc.
SGRAM by two
128K*32*2
(2MB)
-24-
Physical Buffer Memory
Allocation (eg, 2MB)
Preliminary VT6516 Datarsheet
Physical Device
Physical Device
Memory Hole
(14MB)
(1MB)
(1MB)
Physical SRAM Memory
Allocation (eg, 128K)
(Link-List Hole)
Address table
Link List
Link List
entries