LAN88710BMR SMSC, LAN88710BMR Datasheet - Page 29

• Manufacturer Part Number: LAN88710BMR
• Description: Ethernet ICs MII/RMII 10/100 Automot Transceiver
• Manufacturer: SMSC

Specifications of LAN88710BMR

• Ethernet Connection Type: 10BASE-T, 100BASE-TX
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Product: Ethernet Transceivers
• Standard Supported: IEEE802.3, IEEE802.3u
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 1.6 V
• Maximum Operating Temperature: + 105 C
• Package / Case: QFN-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Small Footprint MII/RMII 10/100 Ethernet Transceiver for Automotive Applications
Datasheet
SMSC LAN88710AM/LAN88710BM
3.2.1
3.2.2
If the full capabilities of the transceiver are advertised (100M, Full Duplex), and if the link partner is
capable of 10M and 100M, then auto-negotiation selects 100M as the highest performance mode. If
the link partner is capable of half and full duplex modes, then auto-negotiation selects full duplex as
the highest performance operation.
Once a capability match has been determined, the link code words are repeated with the acknowledge
bit set. Any difference in the main content of the link code words at this time will cause auto-negotiation
to re-start. Auto-negotiation will also re-start if not all of the required FLP bursts are received.
The capabilities advertised during auto-negotiation by the transceiver are initially determined by the
logic levels latched on the MODE[2:0] configuration straps after reset completes. These configuration
straps can also be used to disable auto-negotiation on power-up. Refer to
Mode Configuration," on page 38
Writing the bits 8 through 5 of the
the capabilities advertised by the transceiver. Writing the
does not automatically re-start auto-negotiation. The
Register
via software by clearing the
Note: The device does not support “Next Page” capability.
Parallel Detection
If the LAN88710AM/LAN88710BM is connected to a device lacking the ability to auto-negotiate (i.e.
no FLPs are detected), it is able to determine the speed of the link based on either 100M MLT-3
symbols or 10M Normal Link Pulses. In this case the link is presumed to be half duplex per the IEEE
standard. This ability is known as “Parallel Detection.” This feature ensures interoperability with legacy
link partners. If a link is formed via parallel detection, then the
of the
of auto-negotiation. The controller has access to this information via the management interface. If a
fault occurs during parallel detection, the
Able
Auto Negotiation Link Partner Ability Register
is coded in the received FLPs. If the link partner is not auto-negotiation capable, then the
Negotiation Link Partner Ability Register
speed capability of the link partner.
Restarting Auto-Negotiation
Auto-negotiation can be restarted at any time by setting the
Control
caused by signal loss. This may occur because of a cable break, or because of an interruption in the
signal transmitted by the link partner. Auto-negotiation resumes in an attempt to determine the new
link configuration.
If the management entity re-starts auto-negotiation by setting the
Basic Control
transmission/receiving operations. Once the break_link_timer is completed in the auto-negotiation
state-machine (approximately 1200 ms), auto-negotiation will re-start. In this case, the link partner will
have also dropped the link due to lack of a received signal, so it too will resume auto-negotiation.
is set.
Auto Negotiation Expansion Register
Register. Auto-negotiation will also restart if the link is broken at any time. A broken link is
must be set before the new abilities will be advertised. Auto-negotiation can also be disabled
Register, the LAN88710AM/LAN88710BM will respond by stopping all
Auto-Negotiation Enable
for additional information.
Auto Negotiation Advertisement Register
DATASHEET
is updated after completion of parallel detection to reflect the
Parallel Detection Fault
29
is cleared to indicate that the Link Partner is not capable
is used to store the link partner ability information, which
bit of the
Restart Auto-Negotiate
Auto Negotiation Advertisement Register
Restart Auto-Negotiate
Basic Control
Link Partner Auto-Negotiation Able
bit of
Restart Auto-Negotiate
Link Partner Auto-Negotiation
Section 3.7.2, "MODE[2:0]:
allows software control of
Register.
bit of the
Revision 1.1 (05-26-10)
bit of the
Basic Control
bit of the
Basic
Auto
bit