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參數(shù)資料
| 型號： | IXF440 |
| 英文描述： | LAN HUB CONTROLLER |
| 中文描述： | 局域網(wǎng)集線器控制器 |
| 文件頁數(shù)： | 61/100頁 |
| 文件大?。?/td> | 1354K |
| 代理商： | IXF440 |
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IXF440 Multiport 10/100 Mbps Ethernet Controller
Datasheet
61
6.0
Network Interface Operation
This chapter describes the MII/SYM port operation. It also describes media access control (MAC),
flow control, full-duplex, and loopback operations. The IXF440 supports full implementation of
the MAC sublayer according to the IEEE 802.3 Standard.
6.1
Operating Modes
Each of the IXF440 eight ports supports MII or SYM interfaces.
In the MII mode, the MII port provides a standard and simple interconnection between the MAC
sublayer and the PHY layer. In this mode, the IXF440 can be used with any device with an MII
interface that implements the 100BASE-TX, 100BASE-FX, 100BASE-T4, or 10BASE-T
standards. Through the MII interface, PHYs can also be connected beyond a connector.
The MII interface comprises the following characteristics:
Supports both 100 Mbps and 10 Mbps data rates
Includes data and delimiters that are synchronous to clock references
Provides independent, 4-bit transmit and receive data paths
Utilizes TTL signal levels
Provides a simple management interface
Provides the capability to drive a limited length of shielded cable
In the SYM mode, the PCS encoding/decoding is done by the IXF440, which enables connection
of simple FDDI PHY devices implementing the 100BASE-TX or 100BASE-FX standards. For
100BASE-TX connections, the IXF440 also implements scrambler and descrambler functions
according to the ANSI TP-PMD standard. The SYM port is multiplexed together with the MII port.
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