參數(shù)資料
型號: L80227
廠商: LSI CORP
元件分類: 網(wǎng)絡(luò)接口
英文描述: 10BASE-T/100BASE-TX Ethernet Physical Layer Device (PHY)(10BASE-T/100BASE-TX 以太網(wǎng)物理層處理器)
中文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP64
封裝: LQFP-64
文件頁數(shù): 93/158頁
文件大?。?/td> 1084K
代理商: L80227
Draft 6/5/00
General Operation
5-3
Copyright 1999 by LSI Logic Corporation. All rights reserved.
5.2 General Operation
The MI serial port is idle when at least 32 continuous ones are detected
on the bi-directional MDIO data pin and remains idle as long as
continuous ones are detected. During idle, the MDIO output driver is in
the high-impedance state. When the MI serial port is in the idle state, a
0b01 pattern on the MDIO pin initiates a serial shift cycle. Control and
address bits are clocked into MDIO on the next 14 rising edges of MDC
(the MDIO output driver is still in a high-impedance state). If multiple
register access is not enabled, data is either shifted in or out on MDIO
on the next 16 rising edges of MDC, depending on whether a write or
read cycle was selected with the READ and WRITE operation bits. After
the 32 MDC cycles have been completed:
One complete register has been read or written
The serial shift process is halted
Data is latched into the device
The MDIO output driver goes into a high-impedance state.
Another serial shift cycle cannot be initiated until the idle condition is
detected again (at least 32 continuous ones).
Figure 5.1
shows a timing
diagram for a MI serial port cycle.
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