LAN8187-JT Standard Microsystems (SMSC), LAN8187-JT Datasheet - Page 53

• Manufacturer Part Number: LAN8187-JT
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN8187-JT

• Number Of Receivers: 1
• Data Rate: 10/100Mbps
• Operating Supply Voltage (typ): 3.3V
• Package Type: TQFP
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• Mounting: Surface Mount
• Pin Count: 64
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Lead Free Status / RoHS Status: Compliant

±15kV ESD Protected MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX & flexPWR
Datasheet
SMSC LAN8187/LAN8187i
5.4.8.2
5.4.8.3
Ethernet
10/100
MAC
Ethernet
10/100
MAC
signal will be inactive in this mode, unless collision test (bit 0.7) is active. The transmitters are powered
down, regardless of the state of TXEN.
Far Loopback
Far loopback is a special test mode for MDI (analog) loopback as indicated by the blue arrows in
Figure
data that is received from the link partner on the MDI is looped back out to the link partner. The digital
interface signals on the local MAC interface are isolated.
Connector Loopback
The LAN8187/LAN8187i maintains reliable transmission over very short cables, and can be tested in
a connector loopback as shown in
TXD
5.3. The far loopback mode is enabled by setting bit register 17 bit 9 to logic one. In this mode,
RXD
TXD
X
X
RXD
Digital
Ethernet Transceiver
Figure 5.2 Near-end Loopback Block Diagram
Far-end system
Digital
Ethernet Transceiver
Figure 5.3 Far Loopback Block Diagram
SMSC
SMSC
Analog
DATASHEET
Figure
Analog
53
5.4. An RJ45 loopback cable can be used to route the
®
Technology
X
X
TX
RX
TX
RX
XFMR
XFMR
CAT-5
CAT-5
Revision 1.6 (02-27-09)
Partner
Link