LAN9220-ABZJ Standard Microsystems (SMSC), LAN9220-ABZJ Datasheet - Page 75

• Manufacturer Part Number: LAN9220-ABZJ
• Description: 10/100 NON-PCI ETHERNET CONTROLLER
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN9220-ABZJ

• Operating Supply Voltage (typ): 1.8/3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 56
• Lead Free Status / RoHS Status: Compliant

16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support
Datasheet
SMSC LAN9220
4.8
Auto-Negotiation
Auto-Negotiation
Auto-Negotiation
Auto-Negotiation
Auto-Negotiation
Auto-Negotiation
Auto-Negotiation
Auto-Negotiation
Manual
Manual
Manual
Manual
Manual
Manual
Manual
Manual
MODE
Note 4.1
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
The LAN9220 10/100 PHY internal CRS signal operates in two modes: Active and Low.
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.
100 Mbps
100 Mbps
100 Mbps
100 Mbps
100 Mbps
100 Mbps
100 Mbps
100 Mbps
10 Mbps
10 Mbps
10 Mbps
10 Mbps
10 Mbps
10 Mbps
10 Mbps
10 Mbps
SPEED
Table 4.2 CRS Behavior
DATASHEET
Half-Duplex
Half-Duplex
Half-Duplex
Half-Duplex
Half-Duplex
Half-Duplex
Half-Duplex
Half-Duplex
Full-Duplex
Full-Duplex
Full-Duplex
Full-Duplex
Full-Duplex
Full-Duplex
Full-Duplex
Full-Duplex
DUPLEX
75
Figure
4.3, the SMSC LAN9220 Auto-MDIX PHY is
Transmitting
Transmitting
Transmitting
Transmitting
Transmitting
Transmitting
Transmitting
Transmitting
ACTIVITY
Receiving
Receiving
Receiving
Receiving
Receiving
Receiving
Receiving
Receiving
CRS BEHAVIOR
Revision 2.7 (03-15-10)
(Note
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Low
Low
Low
Low
4.1)