參數(shù)資料
型號: DM8108
廠商: Electronic Theatre Controls, Inc.
英文描述: 8 port 10/100M Fast Ethernet Switching Controller
中文描述: 8端口10/100M快速以太網(wǎng)交換控制器
文件頁數(shù): 22/35頁
文件大?。?/td> 371K
代理商: DM8108
DM8108
8 port 10/100M Fast Ethernet Switching Controller
Transmit Descriptors (TxDR) – A set of 9 transmit
descriptor rings. Each ring contains 512 descriptors.
The Descriptor’s size is 32-bit and contains the
Receiving Buffer’s Block Number, the packet length
and the packet type (Multicast or Uni-cast). The
Transmit Descriptors reside in the DRAM.
22
Preliminary
Version: DM8108-DS-P02
November 25, 1999
DM8108 data structure components are the following:
Receiving Buffer – a common receive buffer is
allocated for each Fast Ethernet Receiving Port and
Expansion Bus Receiving Port. The size of the
receiving buffer is defined as 642KB (448 blocks) or
1728KB (1152 blocks) (depending on the DRAM size)
of 1.5K Bytes each. The DM8108 allocates the buffers
to the 8 Ethernet ports and the Expansion port.
Read/Write Pointers – 9 pairs of pointers to the
Transmit Descriptors.
23 22 1211 0
Read Pointer
Tx Descriptors: 1K x 3 Receive Buffer
Empty List
Frame # 0
Frame # 1
Frame # 2
Frame # n
M/ -U
Byte Count
Block Number
Write Pointer
Next Empty
Rx Block #
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