L-ET1011C2-CI-D LSI, L-ET1011C2-CI-D Datasheet - Page 8

• Manufacturer Part Number: L-ET1011C2-CI-D
• Manufacturer: LSI

Specifications of L-ET1011C2-CI-D

• Number Of Receivers: 1
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / Rohs Status: Compliant

Gigabit Ethernet Transceiver
Functional Description
Link Monitor
1000Base-T
Once 1000Base-T is autonegotiated and the link is estab-
lished, both link partners continuously monitor their local
receiver status. If the master device determines a problem
with its receiver, it signals the slave and both devices cease
transmitting data but transmit IDLE. If the master retrains its
receiver within 750 ms, then normal operation recom-
mences. Otherwise, both devices restart autonegotiation.
If the slave device determines a problem with its receiver, it
ceases transmitting and expects the master to transmit the
IDLE sequence. If the slave retrains its receiver within 350
ms, normal operation recommences when the master signals
that its receiver is ready. If either receiver fails to reacquire,
then autonegotiation is restarted.
100Base-TX
In 100Base-TX mode, the ET1011C monitors the link and
determines the link quality based on signal energy, mean
square error and scrambler lock. If the link quality is deemed
insufficient, transmit and receive data are disabled. If the
link had been autonegotiated, then control is handed back to
autonegotiation. If the link had been manually set, the
100Base-TX receiver is retrained, and the transmitter is set
to transmit idle. Once the link quality has been recovered,
data transmit and receive are enabled.
10Base-T
In 10Base-T mode, the ET1011C monitors the link and
determines the link quality based either on the presence of
valid link pulses or valid 10Base-T packets. If the link is
deemed to have failed and the link had been autonegotiated,
then control is handed back to autonegotiation. If the link
had been manually set, the ET1011C continues to try to rees-
tablish the link.
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(continued)
LEDs
Four status LEDs are provided. These can be used to indicate
speed of operation, duplex mode, link status, etc. There is a
very high degree of programmability allowed. Hence, the
LEDs can be programmed to different status functions from
their default value, or they can be controlled directly from
the MII register interface. The LED signal pins can also be
used for general-purpose I/O if not needed for LED indica-
tion.
Regulator Control
The ET1011C has two on-chip regulator controllers. This
allows the device to be powered from a single supply, either
3.3 V or 2.5 V. The on-chip regulator control circuits provide
output control voltages that can be used to control two exter-
nal transistors and thus provide regulated 1.0 V and 2.5 V
supplies.
Resetting the ET1011C
The ET1011C provides the ability to reset the device by
hardware (pin RESET_N) or via software through the man-
agement interface. A hardware reset is accomplished by
driving the active-low pin RESET_N to 0 volts for a mini-
mum of 20 μs. The configuration pins and the physical
address configuration are read during a hardware reset. A
hardware reset is required after powerup in order to ensure
proper operation.
A software reset is accomplished by setting bit 15 of the con-
trol register (MII register address 0, bit 15). The configura-
tion pins and the physical address configuration are not read
during software reset.
September 2007
LSI Corporation