LAN8720A-CP SMSC, LAN8720A-CP Datasheet - Page 41

• Manufacturer Part Number: LAN8720A-CP
• Description: TXRX ETHERNET 10/100 RMII
• Manufacturer: SMSC
• Type: Transceiverr

Specifications of LAN8720A-CP

• Number Of Drivers/receivers: 4/4
• Protocol: RMII
• Voltage - Supply: 1.6 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1080

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720A/LAN8720Ai
3.8.8.3
Ethernet
Ethernet
10/100
10/100
MAC
MAC
Control/Status Register
looped back out to the link partner. The digital interface signals on the local MAC interface are isolated.
Connector Loopback
The device maintains reliable transmission over very short cables, and can be tested in a connector
loopback as shown in
an the output of the transformer back to the receiver inputs, and this loopback will work at both 10 and
100.
TXD
TXD
RXD
RXD
X
X
Digital
Digital
Ethernet Transceiver
Ethernet Transceiver
Figure 3.14 Connector Loopback Block Diagram
Far-end system
Figure 3.13 Far Loopback Block Diagram
Figure
to “1”. In this mode, data that is received from the link partner on the MDI is
SMSC
SMSC
3.14. An RJ45 loopback cable can be used to route the transmit signals
Analog
Analog
DATASHEET
41
TX
RX
TX
RX
XFMR
XFMR
RJ45 Loopback Cable.
Created by connecting pin 1 to pin 3
and connecting pin 2 to pin 6.
CAT-5
1
2
3
4
5
6
7
8
Revision 1.2 (11-10-10)
Partner
Link