参数资料
型号: GT-48002A
厂商: Galileo Technology Services, LLC
英文描述: Switched Fast Ethernet Controller for 100BaseX(100BaseX交换式快速以太网控制器)
中文描述: 交换式快速以太网控制器(100BaseX交换式快速以太网控制器的100BaseX)
文件页数: 16/102页
文件大小: 1001K
代理商: GT-48002A
GT-48002A Switched Fast Ethernet Controller
20
Revision 1.2
5.
GT-48002A Buffers and Queues
The GT-48002A incorporates three transmit queues for the 2 Ethernet ports and the PCI bus port, and one common
receive buffer area (see Figure 2.) The receive buffers as well as the transmit queues are located in the DRAM along
with the Address Table. DRAM address mapping in the GT-48002A is shown in Table 3. The GT-48002A data structure
components are the following:
Receive Buffer - A common Receive Buffer area for all ports. The buffer is divided into 320 or 1008 blocks
(depending on the DRAM size) of 1.5KBytes (1536 bytes) each. Each block contains the entire packet.
Rx Empty List - A list of 320 or 1008 bits. Each bit contains the status of its appropriate receive block in the
DRAM (empty or occupied).
Tx Descriptors - A set of 3 transmit descriptor rings. Each ring contains 1024 descriptors. The descriptor size
is one 32-bit word and contains the Block Address divided by 0x600 (1.5K), the byte count and the packet type
(Multicast or Unicast).
Read/Write Pointers - 3 pairs of pointers to the transmit descriptors.
Figure 2: GT-48002A Buffers and Queues
Read Pointer
Write Pointer
21
Byte Count Blk Addr
10 9
0
Frame #0
Frame #1
Frame #2
Receive Buffer (for all ports and PCI)
Tx Descriptors: 1024 X 3
Rx Empty List
DRAM
GT-48002A
M/U
20
Frame #n
相关PDF资料
PDF描述
GT-48004A Four Port Switched Fast Ethernet Controller(四端口、交换式快速以太网控制器)
GT-48006A Low Cost Two Port 10/100Mbps Ethernet Bridge/Switch Controller(低成本、双端口10/100Mbps以太网桥式/交换式控制器)
GT-48207 Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高级交换式 10+10/100 BaseX以太网控制器)
GT-48208 Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高级交换式 10+10/100 BaseX以太网控制器)
GT-48212 Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高级交换式 10+10/100 BaseX以太网控制器)
相关代理商/技术参数
参数描述
GT482 制造商:CORNELL DUBILIER ELECTRONICS 功能描述:Cap Ceramic 82pF 3000V SL 5% (12 X 6mm) Radial 9.5mm 85°C
GT48212-A6-PBB1C000 制造商:Marvell 功能描述:
GT48212-A6-PBB-C000 制造商:Marvell 功能描述:12 PORT E + 2 PORT FE SWITCH (MANAGED) - Trays
GT48300-A1-BBE1C083 制造商:Marvell 功能描述:Marvell GT48300-A1-BBE1C083
GT48300-A1-BBE-C000 制造商:Marvell 功能描述:Marvell GT48300-A1-BBE-C000