Small Footprint MII/RMII 10/100 Ethernet Transceiver for Automotive Applications
Datasheet
Chapter 1 Introduction
1.1
General Terms and Conventions
The following is a list of the general terms used throughout this document:
BYTE
FIFO
MAC
MII
8 bits
First In First Out buffer; often used for elasticity buffer
Media Access Controller
Media Independent Interface
RMIITM
N/A
Reduced Media Independent InterfaceTM
Not Applicable
X
Indicates that a logic state is “don’t care” or undefined.
RESERVED
Refers to a reserved bit field or address. Unless otherwise noted, reserved
bits must always be zero for write operations. Unless otherwise noted, values
are not guaranteed when reading reserved bits. Unless otherwise noted, do
not read or write to reserved addresses.
SMI
Serial Management Interface
1.2
General Description
The LAN88710AM/LAN88710BM is a low-power 10BASE-T/100BASE-TX physical layer (PHY)
transceiver with variable I/O voltage that is compliant with the IEEE 802.3-2005 standards. The
LAN88710AM/LAN88710BM has been designed and tested to automotive grade specifications.
The LAN88710AM/LAN88710BM supports communication with an Ethernet MAC via a standard MII
(IEEE 802.3u)/RMII interface. It contains a full-duplex 10-BASE-T/100BASE-TX transceiver and sup-
ports 10 Mbps (10BASE-T) and 100 Mbps (100BASE-TX) operation. The LAN88710AM/LAN88710BM
implements auto-negotiation to automatically determine the best possible speed and duplex mode of
operation. HP Auto-MDIX support allows the use of direct connect or cross-over LAN cables.
The LAN88710AM/LAN88710BM supports both IEEE 802.3-2005 compliant and vendor-specific
register functions. However, no register access is required for operation. The initial configuration may
be selected via the configuration pins as described in Section 3.7, "Configuration Straps," on page 37.
Register-selectable configuration options may be used to further define the functionality of the
transceiver.
Per IEEE 802.3-2005 standards, all digital interface pins are tolerant to 3.6 V. The device can be
configured to operate on a single 3.3 V supply utilizing an integrated 3.3 V to 1.2 V linear regulator.
The linear regulator may be optionally disabled, allowing usage of a high efficiency external regulator
for lower system power dissipation.
SMSC LAN88710AM/LAN88710BM
7
Revision 1.1 (05-26-10)
DATASHEET
SMSC [ SMSC CORPORATION ]
