LAN8187-JT SMSC, LAN8187-JT Datasheet - Page 55

• Manufacturer Part Number: LAN8187-JT
• Description: Ethernet ICs HiPerfrm Ethrnt PHY
• Manufacturer: SMSC
• Type: MII/RMII Ethernet Transceiverr

Specifications of LAN8187-JT

• Ethernet Connection Type: 10 Base-T, 100 Base-TX
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Product: Ethernet Transceivers
• Number Of Transceivers: 1
• Standard Supported: 802.3ab
• Data Rate: 10 MB, 100 MB
• Supply Voltage (max): 3.3 V
• Supply Voltage (min): 1.8 V
• Supply Current (max): 39 mA, 81.6 mA
• Maximum Operating Temperature: + 70 C
• Package / Case: TQFP-64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

±15kV ESD Protected MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX & flexPWR
Datasheet
SMSC LAN8187/LAN8187i
5.4.8.3
5.4.9
5.4.9.1
Ethernet
10/100
MAC
Ethernet
10/100
MAC
Note: This special test mode is only available when operating in RMII mode.
Connector Loopback
The LAN8187/LAN8187i maintains reliable transmission over very short cables, and can be tested in
a connector loopback as shown in
transmit signals an the output of the transformer back to the receiver inputs, and this loopback will
work at both 10 and 100.
Configuration Signals
The PHY has 11 configuration signals whose inputs should be driven continuously, either by external
logic or external pull-up/pull-down resistors.
Physical Address Bus - PHYAD[4:0]
The PHYAD[4:0] signals are driven high or low to give each PHY a unique address. This address is
latched into an internal register at end of hardware reset. In a multi-PHY application (such as a
repeater), the controller is able to manage each PHY via the unique address. Each PHY checks each
management data frame for a matching address in the relevant bits. When a match is recognized, the
PHY responds to that particular frame. The PHY address is also used to seed the scrambler. In a multi-
TXD
RXD
TXD
RXD
X
X
Digital
Ethernet Transceiver
Digital
Figure 5.4 Connector Loopback Block Diagram
Ethernet Transceiver
Figure 5.3 Far Loopback Block Diagram
Far-end system
SMSC
SMSC
Analog
Analog
DATASHEET
Figure
55
5.4. An RJ45 loopback cable can be used to route the
®
Technology
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 1.7 (03-04-11)
Partner
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