LAN89218AQ SMSC, LAN89218AQ Datasheet - Page 81

• Manufacturer Part Number: LAN89218AQ
• Description: Ethernet ICs High Perform Chip 10/100 NonPCI Cntrl
• Manufacturer: SMSC

Specifications of LAN89218AQ

• Ethernet Connection Type: 10BASE-T, 100BASE-TX
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Product: Ethernet Controllers
• Standard Supported: IEEE802.3, IEEE802.3u
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Maximum Operating Temperature: + 85 C
• Package / Case: TQFP-100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High Performance Single-Chip 10/100 Ethernet Controller for Automotive Applications
Datasheet
SMSC LAN89218
4.8
The figure below shows the signal names at the RJ-45 connector, The mapping of these signals to the pins on
the LAN89218 is as follows:
TXP = TPO+
TXN = TPO-
RXP = TPI+
RXN = TPI-
Note 4.1 The LAN89218 10/100 PHY internal CRS signal operates in two modes: Active and Low.
HP Auto-MDIX facilitates the use of CAT-3 (10 Base-T) or CAT-5 (100 Base-T) media UTP interconnect
cable without consideration of interface wiring scheme. If a user plugs in either a direct connect LAN
cable, or a cross-over patch cable, as shown in
capable of configuring the TPO and TPI twisted pair pins for correct transceiver operation.
The internal logic of the device detects the TX and RX pins of the connecting device. Since the RX
and TX line pairs are interchangeable, special PCB design considerations are needed to accommodate
the symmetrical magnetics and termination of an Auto-MDIX design.
The Auto-MDIX function can be disabled through an internal register 27.15, or the external control pins
AMDIX_EN. When disabled the TX and RX pins can be configured with the Channel Select
(CH_SELECT) pin as desired.
HP Auto-MDIX
Figure 4.3 Direct Cable Connection vs. Cross-over Cable Connection
When in Active mode, the internal CRS will transition high and low upon line activity, where
a high value indicates a carrier has been detected. In Low mode, the internal CRS stays
low and does not indicate carrier detection. The internal CRS signal and No Carrier (bit 10
of the TX Status word) cannot be used as a verification method of transmitted packets
when transmitting in 10/100 Mbps full-duplex mode.
DATASHEET
81
Figure
4.3, the SMSC LAN89218 Auto-MDIX PHY is
Revision 1.3 (02-23-10)