LAN89218AQ_samples SMSC, LAN89218AQ_samples Datasheet - Page 80

• Manufacturer Part Number: LAN89218AQ_samples
• Description: Ethernet ICs High Perform Chip 10/100 NonPCI Cntrl
• Manufacturer: SMSC

Specifications of LAN89218AQ_samples

• 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

Revision 1.3 (02-23-10)
4.7.2
4.7.3
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
Disabling Auto-Negotiation
Auto-negotiation can be disabled by setting register 0, bit 12 to zero. The device will then force its
speed of operation to reflect the information in register 0, bit 13 (speed) and register 0, bit 8 (duplex).
The speed and duplex bits in register 0 should be ignored when auto-negotiation is enabled.
Half vs. Full-Duplex
Half-duplex operation relies on the CSMA/CD (Carrier Sense Multiple Access / Collision Detect)
protocol to handle network traffic and collisions. In this mode, the internal carrier sense signal, CRS,
responds to both transmit and receive activity.
transmitting, a collision results.
In full-duplex mode, the PHY is able to transmit and receive data simultaneously. In this mode, the
internal CRS responds only to receive activity. The CSMA/CD protocol does not apply and collision
detection is disabled.
Table 4.2
internal CRS signal is used to trigger bit 10 (No Carrier) of the TX Status word (See
"TX Status
full-duplex transmission. Therefore, these signals cannot be used as a verification method of
transmitted packets when transmitting in 10/100 Mbps full-duplex modes.
describes the behavior of the internal CRS bit under all receive/transmit conditions. The
Format"). The CRS value, and subsequently the No Carrier value, are invalid during any
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
High Performance Single-Chip 10/100 Ethernet Controller for Automotive Applications
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
80
In this mode, If data is received while the PHY is
Transmitting
Transmitting
Transmitting
Transmitting
Transmitting
Transmitting
Transmitting
Transmitting
ACTIVITY
Receiving
Receiving
Receiving
Receiving
Receiving
Receiving
Receiving
Receiving
CRS BEHAVIOR
(Note
SMSC LAN89218
Section 3.12.4,
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Active
Low
Low
Low
Low
4.1)
Datasheet