LAN88710_samples SMSC, LAN88710_samples Datasheet - Page 30

• Manufacturer Part Number: LAN88710_samples
• Description: Ethernet ICs MII/RMII 10/100 Automot Transceiver
• Manufacturer: SMSC

Specifications of LAN88710_samples

• 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: + 85 C
• Package / Case: QFN-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Revision 1.1 (05-26-10)
3.2.3
3.2.4
3.3
Not Used
Not Used
Not Used
Not Used
RXN
RXP
TXP
TXN
Disabling Auto-Negotiation
Auto-negotiation can be disabled by setting the
Register
Control Register (Speed Select
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 carrier sense signal, CRS, responds
to both transmit and receive activity. If data is received while the transceiver is transmitting, a collision
results.
In full duplex mode, the transceiver is able to transmit and receive data simultaneously. In this mode,
CRS responds only to receive activity. The CSMA/CD protocol does not apply and collision detection
is disabled.
HP Auto-MDIX facilitates the use of CAT-3 (10BASE-T) or CAT-5 (100BASE-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
transceiver is capable of configuring the TXP/TXN and RXP/RXN 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 via the
Indications
HP Auto-MDIX Support
RJ-45 8-pin straight-through
1
2
3
4
5
6
7
8
for 10BASE-T/100BASE-TX
Direct Connect Cable
Figure 3.2 Direct Cable Connection vs. Cross-over Cable Connection
to zero. The device will then force its speed of operation to reflect the information in the
Register.
signaling
1
2
3
4
5
6
7
8
Small Footprint MII/RMII 10/100 Ethernet Transceiver for Automotive Applications
TXP
TXN
RXP
Not Used
Not Used
RXN
Not Used
Not Used
bit and
DATASHEET
Duplex Mode
30
Not Used
Not Used
Not Used
Not Used
Auto-Negotiation Enable
AMDIXCTRL
RXN
RXP
TXN
TXP
bit). These bits should be ignored when auto-
1
2
3
4
5
6
7
8
RJ-45 8-pin cross-over for
10BASE-T/100BASE-TX
Cross-Over Cable
Figure
bit in the
signaling
SMSC LAN88710AM/LAN88710BM
3.2, the device’s Auto-MDIX
bit of the
Special Control/Status
1
2
3
4
5
6
7
8
TXP
TXN
RXP
Not Used
Not Used
RXN
Not Used
Not Used
Basic Control
Datasheet
Basic