參數(shù)資料
型號(hào)： ADM6995
廠商： Electronic Theatre Controls, Inc.
英文描述： 5 PORT 10/100 MB/S SINGLE CHIP ETHIERNET SWITCH CONTROLLER
中文描述： 5端口10/100 Mb / s的單芯片ETHIERNET開關(guān)控制器
文件頁數(shù)： 23/57頁
文件大?。?/td> 1815K
代理商： ADM6995
ADM6995L
Function Description
3.6.3
Transmit Driver and Receiver
The ADM6995L integrates all the required signal conditioning functions in its 10Base-T
block such that external filters are not required. Only one isolation transformer and
impedance matching resistors are needed for the 10Base-T transmit and receive interface.
The internal transmit filtering ensures that all the harmonics in the transmission signal are
attenuated properly.
3.6.4
Smart Squelch
The smart squelch circuit is responsible for determining when valid data is present on the
differential receive. The ADM6995L implements an intelligent receive squelch on the
RXP/RXN differential inputs to ensure that impulse noise on the receive inputs will not
be mistaken for a valid signal. The squelch circuitry employs a combination of amplitude
and timing measurements (as specified in the IEEE 802.3 10Base-T standard) to
determine the validity of data on the twisted-pair inputs.
The signal at the start of the packet is checked by the analog squelch circuit and any
pulses not exceeding the squelch level (either positive or negative, depending upon
polarity) will be rejected. Once this first squelch level is overcome correctly, the opposite
squelch level must then be exceeded within 150ns. Finally, the signal must exceed the
original squelch level within an additional 150ns to ensure that the input waveform will
not be rejected.
Only after all these conditions have been satisfied will a control signal be generated to
indicate to the remainder of the circuitry that valid data is present.
Valid data is considered to be present until the squelch level has not been generated for a
time longer than 200 ns, indicating end of packet. Once good data has been detected, the
squelch levels are reduced to minimize the effect of noise, causing premature end-of-
packet detection. The receive squelch threshold level can be lowered for use in longer
cable applications. This is achieved by setting bit 10 of register address 11h.
3.7 Carrier Sense
Carrier Sense (CRS) is asserted due to receive activity once valid data is detected via the
smart squelch function. For 10 Mbits/s half duplex operation, CRS is asserted during
either packet transmission or reception. For 10 Mbits/s full duplex and repeater mode
operations, the CRS is asserted only due to receive activity.
3.8 Jabber Function
The jabber function monitors the ADM6995L output and disables the transmitter if it
attempts to transmit a longer than legal sized packet. If TXEN is high for greater than
ADMtek Inc.
3-7
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADM6995L 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5 PORT 10/100 MB/s SINGLE CHIP ETHERNET SWITCH CONTROLLER
ADM6995LAAT1 功能描述:IC SWITCH CNTRLR 10/100 128QFP RoHS:否 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準(zhǔn)包裝:4,900 系列:- 控制器類型:USB 2.0 控制器 接口:串行 電源電壓:3 V ~ 3.6 V 電流 - 電源:135mA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:36-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:36-QFN（6x6） 包裝:* 其它名稱:Q6396337A
ADM6995LAAT1NP 制造商:Infineon Technologies AG 功能描述:SWITCH / PHY
ADM6995LCACT1 制造商:Infineon Technologies AG 功能描述:
ADM6995LCACT1NP 制造商:Infineon Technologies AG 功能描述:SWITCH / PHY
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