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參數(shù)資料
| 型號： | RTL8308B |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | REALTEK SINGLE CHIP 8-PORT 10/100 ETHERNET SWITCH CONTROLLER WITH EMBEDDED MEMORY |
| 中文描述： | 瑞昱單片8端口10/100以太網(wǎng)交換機(jī)控制器，嵌入式存儲器 |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 397K |
| 代理商： | RTL8308B |
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RTL8308B
2002/01/23
Rev. 2.0
12
6.4 Serial Management Interface MDC/MDIO
The RTL8308B supports PHY management through the serial MDIO and MDC signal lines. After power on reset,
the RTL8308B writes abilities to the advertisement register 4 of the connected PHY and restarts the
auto-negotiation process through MDIO using PHY addresses incrementally from 01000b to 01111b. After
restarting auto-negotiation, the RTL8308B will continuously poll the link status and link partner's ability which
includes speed, duplex and flow control of the PHY devices via MDIO.
The MDIO operation for the RMII is the same as that for the MII. The device will send a ‘01’ to signal a write
operation. The 5 bit ID address of the PHY device and the 5 bit register address is next, and a ‘10’ turn-around
signal is then used to avoid contention during a read transaction. After the turn around, the 16 bits of data will be
written into the register. After the completion of the write transaction, the line will be put into a high impedance
state.
For a read operation, the RTL8308Bwill output a ‘10’ to indicate read operation after the start of frame indicator.
The 5-bit ID address of the PHY device and the 5-bit register address is next. Then, the RTL8308Bwill stop
driving the MDIO line, and wait for one bit time. During this time, the MDIO should be in a high impedance state.
The device will then synchronize with the next bit of ‘0’ driven by the PHY device, and continue to read the 16 bits
of data from the register. The detailed timing requirements on PHY management signals are described in the
timing part of Section 8.
The MDIO port can be disabled through the use of the port configuration register. This allows usage of a
100Base-TX transceiver without auto-negotiation capability or an RMII to RMII interconnect. In this mode of
operation, the PHY has no communication with the RTL8308. Therefore, the RTL8308Bwill assert the link status
as soon as initialization is completed and assumes the connected PHY is operating at the specified operating mode
and speed.
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相關(guān)代理商/技術(shù)參數(shù) |
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| RTL8309SB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SINGLE-CHIP 9-PORT 10/100MBPS SWITCH CONTROLLER |
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