參數(shù)資料
型號: KSZ8873MLLJ
廠商: Micrel Inc
文件頁數(shù): 19/108頁
文件大?。?/td> 0K
描述: IC ETHERNET SWITCH 3PORT 64LQFP
特色產(chǎn)品: KSZ8873MLLJ Ethernet Switches
標(biāo)準(zhǔn)包裝: 160
系列: *
其它名稱: 576-3996
Micrel, Inc.
KSZ8873MLLJ
September 2011
18
M9999-091911-1.8
10BASE-T Receive
On the receive side, input buffers and level detecting squelch circuits are employed. A differential input receiver circuit and a phase-
locked loop (PLL) perform the decoding function. The Manchester-encoded data stream is separated into clock signal and NRZ data.
A squelch circuit rejects signals with levels less than 400mV or with short pulse widths to prevent noise at the RXP-or-RXM input from
falsely triggering the decoder. When the input exceeds the squelch limit, the PLL locks onto the incoming signal and the
KSZ8873MLLJ decodes a data frame. The receiver clock is maintained active during idle periods in between data reception.
MDI/MDI-X Auto Crossover
To eliminate the need for crossover cables between similar devices, the KSZ8873MLLJ supports HP Auto MDI/MDI-X and IEEE
802.3u standard MDI/MDI-X auto crossover. HP Auto MDI/MDI-X is the default.
The auto-sense function detects remote transmit and receive pairs and correctly assigns transmit and receive pairs for the
KSZ8873MLLJ device. This feature is extremely useful when end users are unaware of cable types, and also, saves on an additional
uplink configuration connection. The auto-crossover feature can be disabled through the port control registers, or MIIM PHY registers.
The IEEE 802.3u standard MDI and MDI-X definitions are:
MDI
MDI-X
RJ-45 Pins
Signals
RJ-45 Pins
Signals
1
TD+
1
RD+
2
TD-
2
RD-
3
RD+
3
TD+
6
RD-
6
TD-
Table 1. MDI/MDI-X Pin Definitions
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