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參數(shù)資料
| 型號： | GT-48207 |
| 廠商： | Galileo Technology Services, LLC |
| 英文描述： | Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高級交換式 10+10/100 BaseX以太網(wǎng)控制器) |
| 中文描述： | 先進的交換式以太網(wǎng)控制器的10 10/100 BaseX（高級交換式10 10/100 BaseX以太網(wǎng)控制器） |
| 文件頁數(shù)： | 125/135頁 |
| 文件大?。?/td> | 1619K |
| 代理商： | GT-48207 |
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GT-482xx Switched Ethernet Controllers for 10+10/100 BaseX
GALI
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E
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TECHNOLOGY
CONFI
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ENTI
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DO
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REPRODUCE
Revision 1.2
9
NOTE: This document applies to all the Galaxy GT-482xx devices. All of the
information is relevant specifically for the GT-48212 device (12 Ether-
net ports and two Fast Ethernet ports). However, all of the functional
descriptions are also relevant for all GT-482xx devices. The specific
deviations and differences between the devices are described in sec-
1.
GENERAL DESCRIPTION
The GT-482xx is a high-performance, low-cost, Switched Ethernet Controller for 10+10/100Base-X that provides
packet switching functions between 12 or 8 10Mbps and two 10/100Mbps ports. Switch expansion is possible by
using one of the 100BaseX ports working with a separate oscillator. Switch expansion can reach up to 60Mhz
clock frequency to achieve up to 240Mbps full duplex bandwidth. The GT-482xx can be used in both managed
and unmanaged configurations.
The basic operation of the GT-482xx is quite simple. The GT-482xx receives incoming packets from the Ethernet
or Fast Ethernet wire, searches in the Address Table for the Destination MAC Address and then forwards the
packet to the appropriate port. If the Destination Address is not found, the GT-482xx treats the packet as a Multi-
cast packet. The GT-482xx optionally forwards the packets to specified ports (or all ports in the VLAN, if enabled)
and optionally to the CPU.
The GT-482xx automatically learns the port number of attached network devices by examining the Source MAC
Address of all incoming packets. If the Source Address is not found in the GT-482xx Address Table, the device
adds it to the table indicating on which port the address resides. The GT-482xx then notifies the CPU of the new
address via a New_Address message and an interrupt.
1.1
Fast Ethernet Ports
The GT-482xx integrates two Fast Ethernet ports. Each port works at 10/100Mbps (half duplex) or 20/200Mbps
(full duplex). Two Media Independent Interfaces (MII) are provided for glueless connection to off-the-shelf PHY
chips. Full Auto-Negotiation for both managed and unmanaged switches is supported.
One of the Fast Ethernet ports can be used for switch expansion. In this mode, it can operate at 60Mhz clock fre-
quency to achieve up to 480Mbps full-duplex bandwidth. No special messages other than the regular Ethernet
packets are passed between two Galaxy devices when connected with an expansion port. Management CPU
treats two devices as separate devices which cannot share learning information. However, the CPU can control
the learning (Section 6.4.1 "Port-Based VLAN Support" on page 28), and VLANs can be created by the CPU
across the two devices so that the same VLAN can share ports on different devices.
The GT-482xx incorporates full MII management support. The MDC/MDIO pins are directly controlled by the CPU
(and the Auto-Negotiation state machine, when enabled.)
1.2
Ethernet Ports
The GT-482xx integrates 12 or 8 10Mbps Ethernet ports. Each port works at 10Mbps (half duplex) or 20Mbps (full
duplex) and includes the Media Access Control (MAC), Manchester encoder/decoder, link integrity logic, and a
LED interface.
The GT-482xx Ethernet ports are compliant with both the 802.3 and Ethernet specifications. Each port contains
three pins allowing direct interface with the AMD QuIET (see URL: www.amd.com) or the Tamarack TC3001 (see
URL: www.tmi.com.tw) digital filters. Link indication from the PHY is serially shifted into the GT-482xx on the Link-
Status pins.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| GT-48208 | Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高級交換式 10+10/100 BaseX以太網(wǎng)控制器) |
| GT-48212 | Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高級交換式 10+10/100 BaseX以太網(wǎng)控制器) |
| GT-64010A | System Controller with PCI Interface for R4XXX/ R5000 Family CPUs(帶PCI接口用于R4XXX/ R5000 系列 CPUs的系統(tǒng)控制器) |
| GT-64012 | Secondary Cache Controller For the MIPS R4600/4650/4700/5000,(用于MIPS R4600/4650/4700/5000處理器的二級高速緩存控制器) |
| GT-64111 | System Controller for RC4640, RM523X and VR4300 CPUs(用于RC4640, RM523X和 VR4300 CPUs的系統(tǒng)控制器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| GT48300-A1-BBE-C08 | 制造商:Marvell 功能描述:MVLGT48300-A1-BBE-C083 4 PORT 83MHZ G.LI |
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