參數(shù)資料
型號(hào)： LU3X32FT
廠(chǎng)商： Lineage Power
英文描述： Two-Port 3 V 10/100 Ethernet Transceiver TX/FX(雙端口 3 V 10M位和100M位以太網(wǎng)收發(fā)器)
中文描述： 雙端口3伏10/100以太網(wǎng)收發(fā)器德克薩斯州/外匯（3伏雙端口1000萬(wàn)位和100米位以太網(wǎng)收發(fā)器）
文件頁(yè)數(shù)： 20/54頁(yè)
文件大?。?/td> 626K
代理商： LU3X32FT
LU3X32FT Two-Port 3 V 10/100
Ethernet Transceiver TX/FX
Preliminary Data Sheet
July 2000
20
Lucent Technologies Inc.
Functional Description
(continued)
Carrier Sense
. Carrier sense (CRS) for 100 Mbits/s operation is asserted upon the detection of two non-contigu-
ous zeros occurring within any 10-bit boundary of the receive data stream.
The carrier sense function is independent of symbol alignment. For 100 Mbits/s half-duplex operation, CRS is
asserted during either packet transmission or reception. For 100 Mbits/s full-duplex operation, CRS is asserted
only during packet reception. When the IDLE symbol pair is detected in the receive data stream, CRS is
deasserted. In repeater mode, CRS is only asserted due to receive activity.
Bad SSD Detection
. A bad start of stream delimiter (Bad SSD) is an error condition that occurs in the 100Base-X
receiver if carrier is detected (CRS asserted), and a valid /J/K set of code groups (SSD) is not received.
If this condition is detected, then the LU3X32FT will assert RXER and present RXD[3:0] = 1110 to the MII for the
cycles that correspond to received 5B code-groups until at least two IDLE code groups are detected. In addition,
the false carrier counter (address 13h) will be incremented by one. Once at least two IDLE code groups are
detected, RXER and CRS become de-asserted.
Far-End Fault Indication
. Autonegotiation provides a mechanism for transferring information from the local station
to the link partner that a remote fault has occurred for 100Base-TX. As autonegotiation is not currently specified for
operation over fiber, the far-end fault indication function (FEFI) provides this capability for 100Base-FX applications.
A remote fault is an error in the link that one station can detect while the other cannot. An example of this is a dis-
connected wire at a station’s transmitter. This station will be receiving valid data and will detect that the link is good
via the link integrity monitor, but will not be able to detect that its transmission is not propagating to the other sta-
tion.
A 100Base-FX station that detects such a remote fault may modify its transmitted IDLE stream from all ones to a
group of 84 ones followed by a single 0. This is referred to as the FEFI IDLE pattern.
The FEFI function is controlled by bit 11 of register 18h. It is initialized to 1 (enabled) if both the FOSEL pin and
FEFI_EN pin are at logic high level during powerup or reset. If the FEFI function is enabled, the LU3X32FT will halt
all current operations and transmit the FEFI IDLE pattern when FOSD+/FOSD– signal is deasserted following a
good link indication from the link integrity monitor. Transmission of the FEFI IDLE pattern will continue until FOSD+/
FOSD– signal is asserted. If three or more FEFI IDLE patterns are detected by the LU3X32FT, then bit 4 of the
basic mode status register (address 01h) is set to one until read by management. Additionally, upon detection of
far-end fault, all receive and transmit MII activity is disabled/ignored.
Carrier Integrity Monitor
. The carrier integrity monitor (CIM) function protects the repeater from transient condi-
tions that would otherwise cause spurious transmission due to a faulty link. This function is required for repeater
applications and is not specified for node applications.
The CIM function is controlled by bit 10 of register 18h. It is initialized to 1 (enabled) if both the NDRPTR pin and
CIMEN pin are at logic high level during powerup or reset. If the CIM determines that the link is unstable, the
LU3X32FT will not propagate the received data or control signaling to the MII and will ignore data transmitted via
the MII. The LU3X32FT will continue to monitor the receive stream for valid carrier events. The false carrier counter
(address 13h) increments each time the link is unstable (bad SSD), the FCRS pin stays high as long as error con-
dition exists. Two back-to-back false carrier events will isolate the PHY, incrementing the associated isolate counter
(register address 12h) once.
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