參數(shù)資料
型號(hào)： KSZ8051MNLI
廠商： Micrel Inc
文件頁(yè)數(shù)： 13/59頁(yè)
文件大小： 0K
描述： TXRX PHY 10/T100 3.3V 32QFN
標(biāo)準(zhǔn)包裝： 640
類型： PHY 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 1/1
規(guī)程： MII
電源電壓： 1.8V，2.5V，3.3V
安裝類型： 表面貼裝
封裝/外殼： 32-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 32-QFN（5x5）
包裝： 托盤
配用： 576-3865-ND - BOARD EVALUATION FOR KSZ8051MNL
其它名稱： 576-3845
Micrel, Inc.
KSZ8051MNL/RNL
July 2010
20
M9999-070910-1.0
Scrambler/De-scrambler (100Base-TX only)
The scrambler is used to spread the power spectrum of the transmitted signal to reduce EMI and baseline wander, and
the de-scrambler is needed to recover the scrambled signal.
SQE and Jabber Function (10Base-T only)
In 10Base-T operation, a short pulse is put out on the COL pin after each frame is transmitted. This SQE Test is required
as a test of the 10Base-T transmit/receive path. If transmit enable (TXEN) is high for more than 20 ms (jabbering), the
10Base-T transmitter is disabled and COL is asserted high. If TXEN is then driven low for more than 250 ms, the 10Base-
T transmitter is re-enabled and COL is de-asserted (returns to low).
PLL Clock Synthesizer
The KSZ8051MNL/RNL generates all internal clocks and all external clocks for system timing from an external 25MHz
crystal, oscillator, or reference clock. For the KSZ8051RNL in RMII 50MHz clock mode, these clocks are generated from
an external 50MHz oscillator or system clock.
Auto-Negotiation
The KSZ8051MNL/RNL conforms to the auto-negotiation protocol, defined in Clause 28 of the IEEE 802.3 Specification.
Auto-negotiation allows UTP (Unshielded Twisted Pair) link partners to select the highest common mode of operation.
During auto-negotiation, link partners advertise capabilities across the UTP link to each other, and then compare their own
capabilities with those they received from their link partners. The highest speed and duplex setting that is common to the
two link partners is selected as the mode of operation.
The following list shows the speed and duplex operation mode from highest to lowest priority.
Priority 1: 100Base-TX, full-duplex
Priority 2: 100Base-TX, half-duplex
Priority 3: 10Base-T, full-duplex
Priority 4: 10Base-T, half-duplex
If auto-negotiation is not supported or the KSZ8051MNL/RNL link partner is forced to bypass auto-negotiation, then the
KSZ8051MNL/RNL sets its operating mode by observing the signal at its receiver. This is known as parallel detection, and
allows the KSZ8051MNL/RNL to establish link by listening for a fixed signal protocol in the absence of auto-negotiation
advertisement protocol.
Auto-negotiation is enabled by either hardware pin strapping (NWAYEN, pin 30) or software (register 0h, bit 12).
By default, auto-negotiation is enabled after power-up or hardware reset. Afterwards, auto-negotiation can be enabled or
disabled by register 0h, bit 12. If auto-negotiation is disabled, the speed is set by register 0h, bit 13, and the duplex is set
by register 0h, bit 8.
The auto-negotiation link up process is shown in the following flow chart.
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