參數(shù)資料
型號(hào)： KSZ8995XA
廠商： Micrel Inc
文件頁(yè)數(shù)： 13/51頁(yè)
文件大?。?/td> 0K
描述： IC SWITCH 10/100 5PORT 128PQFP
標(biāo)準(zhǔn)包裝： 66
系列： *
類型： *
應(yīng)用： *
安裝類型： 表面貼裝
封裝/外殼： 128-BFQFP
供應(yīng)商設(shè)備封裝： 128-PQFP（14x20）
包裝： 托盤
產(chǎn)品目錄頁(yè)面： 1081 (CN2011-ZH PDF)
配用： 576-1642-ND - BOARD EVALUATION FOR KSZ8995XA
其它名稱： 576-1042
KS8995XA
Micrel, Inc.
M9999-051305
20
May 2005
100BASE-FX Signal Detection
The physical port runs in 100BASE-FX mode if FXSDx >0.6V for ports 4 and 5 only. This signal is internally referenced to
1.25V.The fiber module interface should be set by a voltage divider such that FXSDx ‘H’ is above this 1.25V reference,
indicating signal detect, and FXSDx ‘L’ is below the 1.25V reference to indicate no signal. When FXSDx is below 0.6V then
100BASE-FX mode is disabled.
100BASE-FX Far End Fault
Far end fault occurs when the signal detection is logically false from the receive fiber module. When this occurs, the
transmission side signals the other end of the link by sending 84 1’s followed by a zero in the idle period between frames. The
far end fault may be disabled through register settings.
10BASE-T Transmit
The output 10BASE-T driver is incorporated into the 100BASE-T driver to allow transmission with the same magnetics. They
are internally wave-shaped and pre-emphasized into outputs with a typical 2.3V amplitude. The harmonic contents are at least
27dB below the fundamental when driven by an all-ones Manchester-encoded signal.
10BASE-T Receive
On the receive side, input buffer and level detecting squelch circuits are employed. A differential input receiver circuit and a
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 pulsewidths in order to prevent noises 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 KS8995XA decodes a data frame. The receiver clock is maintained active during idle periods in between data
reception.
Power Management
The KS8995XA features a per port power down mode. To save power the user can power down ports that are not in use by
setting port control registers or MII control registers. In addition, it also supports full chip power down mode. When activated,
the entire chip will be shutdown.
MDI/MDI-X Auto Crossover
The KS8995XA supports MDI/MDI-X auto crossover. This facilitates the use of either a straight connection CAT-5 cable or a
crossover CAT-5 cable. The auto-sense function will detect remote transmit and receive pairs, and correctly assign the transmit
and receive pairs from the Micrel device. This can be highly useful when end users are unaware of cable types and can also
save on an additional uplink configuration connection. The auto crossover feature may be disabled through the port control
registers.
Auto-Negotiation
The KS8995XA conforms to the auto-negotiation protocol as described by the 802.3 committee. Auto-negotiation allows
unshielded twisted pair (UTP) link partners to select the best common mode of operation. In auto-negotiation the link partners
advertise capabilities across the link to each other. If auto-negotiation is not supported or the link partner to the KS8995XA
is forced to bypass auto-negotiation, then the mode is set by observing the signal at the receiver. This is known as parallel mode
because while the transmitter is sending auto-negotiation advertisements, the receiver is listening for advertisements or a fixed
signal protocol.
The flow for the link set up is depicted in Figure 4.
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