AC101LKQT Broadcom, AC101LKQT Datasheet - Page 13

• Manufacturer Part Number: AC101LKQT
• Manufacturer: Broadcom

Specifications of AC101LKQT

• Number Of Receivers: 1
• Data Rate: 10/100Mbps
• Package Type: TQFP
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 48
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / Rohs Status: Not Compliant

03/10/03
FEF (F
Auto-negotiation provides the mechanism to inform the link partner that a remote fault has occurred. Auto-negotiation is
disabled, however, in the 100BASE-FX applications. An alternative in-band signaling function (FEFI) is used to signal a
remote fault condition.
FEFI is a stream of 84 consecutive ones followed by one logic zero. This pattern is repeated three times.
An FEFI signal is given under three conditions:
•
•
•
The FEFI mechanism is enabled by default in the 100BASE-FX mode, and is disabled in 100BASE-TX or 10BASE-T modes.
The register setting can be changed by software after reset.
T
In 100BASE-TX mode, the PHY transmit function converts synchronous 4-bit data nibbles from the MII to a pair of 125 Mbps
differential serial data streams. The serial data is transmitted over network twisted-pair cables via an isolation transformer.
Data conversion includes 4B/5B encoding, scrambling, parallel-to-serial, NRZ to NRZI, and MLT3 encoding. The entire
operation is synchronous to the 25 MHz and 125 MHz clocks. Both clocks are generated by an on-chip PLL clock synthesizer
that is locked on to an external 25 MHz clock source.
In 100BASE-FX, the transmit driver does not perform filtering; it utilizes a current drive output that is well balanced and
produces a low noise PECL signal. PECL voltage levels are produced with resistive terminations.
In 10BASE-T mode, if the MII interface is used, parallel-to-serial logic is used to convert the 4-bit data into the serial stream
through the output wave shaping driver. The wave shaper reduces any EMI emission by filtering out the harmonics, therefore
eliminating the need for an external filter.
HP A
This feature is able to detect the required cable connection type (straight through or crossed over) and make correction
automatically.
Document
RANSMIT
When no activity is received from the link partner,
When the clock recovery circuit detects a signal error or PLL lock error,
When a management entity sets the Transmit Far-End Fault bit.
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