KSZ8873MLLI Micrel Inc, KSZ8873MLLI Datasheet - Page 42
KSZ8873MLLI
Manufacturer Part Number
KSZ8873MLLI
Description
IC ETHERNET SWITCH 3PORT 64LQFP
Manufacturer
Micrel Inc
Specifications of KSZ8873MLLI
Controller Type
Ethernet Switch Controller
Interface
MII
Voltage - Supply
1.8V, 2.5V, 3.3V
Operating Temperature
-40°C ~ 85°C
Mounting Type
*
Package / Case
*
Number Of Primary Switch Ports
3
Internal Memory Buffer Size
32
Fiber Support
No
Integrated Led Drivers
Yes
Phy/transceiver Interface
MII
Power Supply Type
Analog
Data Rate (typ)
10/100Mbps
Vlan Support
Yes
Operating Temperature (max)
85C
Operating Temperature (min)
-40C
Mounting
Surface Mount
Jtag Support
No
Operating Supply Voltage (max)
1.89/3.465V
Operating Temperature Classification
Industrial
Data Rate
100Mbps
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Supply
-
Lead Free Status / RoHS Status
Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Micrel, Inc.
Loopback Support
The KSZ8873MLL/FLL/RLL provides loopback support for remote diagnostic of failure. In loopback mode, the speed at
both PHY ports needs to be set to 100BASE-TX. Two types of loopback are supported: Far-end Loopback and Near-end
(Remote) Loopback.
Far-end Loopback
Far-end loopback is conducted between the KSZ8873MLL/FLL/RLL’s two PHY ports. The loopback is limited to few
package a time for diagnosis purpose and can not support large traffic. The loopback path starts at the “Originating.” PHY
port’s receive inputs (RXP/RXM), wraps around at the “loopback” PHY port’s PMD/PMA, and ends at the “Originating”
PHY port’s transmit outputs (TXP/TXM).
Bit [0] of registers 29 and 45 is used to enable far-end loopback for ports 1 and 2, respectively. Alternatively, the MII
Management register 0, bit [14] can be used to enable far-end loopback.
The far-end loopback path is illustrated in the following figure.
September 2009
R X P /
R X M
Figure 14. Far-End Loopback Path
P M D /P M A
P M D /P M A
S w itc h
O rigina ting
P H Y P ort
L o op B ack
P H Y P o rt
M A C
M A C
P C S
P C S
42
T X P /
T X M
KSZ8873MLL/FLL/RLL
M9999-092309-1.2