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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： | 10/102页 |
| 文件大小： | 1001K |
| 代理商： | GT-48002A |
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Switched Fast Ethernet Controller
Revision 1.2
15
3.
Operational Overview
The GalNet Architecture Family of switching devices has been defined as an extensible, scalable architecture for the
switching of packetized data. The GalNet Architecture Family currently supports Ethernet (GT-48001A), Fast Ethernet
(GT-48002A), and 100VG-AnyLAN (GT-48003.) Galileo Technology will extend the innovative GalNet family to include
other communications standards including WAN in the near future.
All GalNet Architecture Family devices act as distributed intelligent agents within a switching system. Each GalNet
device makes switching decisions independent of other devices in the system, and can communicate information
regarding the network to all other agents. This distributed processing approach is a significant performance improve-
ment over switching architectures that rely on centralized switching “engines” or single-point address recognition
devices. Unlike centralized resource approaches, GalNet designs can actually add packet processing capability as
additional ports are added.
The GalNet Architecture Family uses a “store-and-forward” switching approach. Store-and-forward was chosen for the
following reasons:
Store-and-forward switches allow switching between differing speed media (e.g. 10BaseX and 100BaseX.)
Such switches require the large elastic buffers that are provided by the EDO DRAM arrays.
Store-and-forward switches improve overall network performance by acting as a “network cache”, effectively
buffering packets during times of heavy congestion.
Store-and-forward switches prevent the forwarding of corrupted packets by analyzing the frame check
sequence (FCS) before forwarding to the destination port.
A typical unmanaged GalNet Architecture system is extremely simple to implement as shown in Figure 1 on page 6. No
CPU is needed as each GalNet device is intelligent and capable of sharing network information and packet data auton-
omously. A CPU may be added to provide network management capability.
3.1
Enabling/Disabling the GT-48002A
Ports of the GT-48002A can be enabled and disabled depending on the combination of:
An external hardware pin, EnDev* (LOW - device enabled, HIGH - device disabled)
EnableDevice, bit 27 of the Global Control Register (‘0’ - device status based on EnDev*, ‘1’ - device enabled)
PortEn, bit 0 of each Port Control Register, (‘0’ - port disabled, ‘1’ - port enabled)
When a port is disabled, no packets will be received or transmitted from the serial ports or the PCI bus. Even though
ports are disabled, another PCI master can read from and write to the GT-48002A’s registers. See Table 1 for enabling
or disabling ports of the GT-48002A.
Table 1: Enabling/Disabling Ports of the GT-48002A
3.2
Basic Operation
The basic operation of the GT-48002A is quite simple. The GT-48002A receives incoming packets from the Fast Ether-
net wire, searches in the Address Table for the Destination MAC Address and then forwards the packet to the appropri-
ate port. The destination port can be either be local (one of the GT-48002A’s ports) or in a different GT-48002A device
E n D ev*
Pi n
E n ab leD evi ce
Bi t
Po rt En
Bi t
Por t St atu s
LOW
0
Disabled
LOW
0
1
Enabled
LOW
1
0
Disabled
LOW
1
Enabled
HIGH
0
Disabled
HIGH
0
1
Disabled
HIGH
1
0
Disabled
HIGH
1
Enabled
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 |
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