ksz8051mlli Micrel Semiconductor, ksz8051mlli Datasheet - Page 19

• Manufacturer Part Number: ksz8051mlli
• Description: 10base-t/100base-tx Physical Layer Transceiver
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
Back-to-Back Mode – 100Mbps Copper Repeater / Media Converter
Two KSZ8051MLL devices can be connected back-to-back to form a 100Base-TX to 100Base-TX copper repeater.
A KSZ8051MLL and a KSZ8041FTL can be connected back-to-back to provide a low-cost media converter solution.
Media conversion is between 100Base-TX copper and 100Base-FX fiber. On the copper side, link up at 10Base-T is not
allowed, and is blocked during auto-negotiation.
MII Back-to-Back Mode (KSZ8051MLL only)
In MII Back-to-Back mode, a KSZ8051MLL interfaces with another KSZ8051MLL, or a KSZ8041FTL to provide a
complete 100Mbps copper repeater, or media converter solution, respectively.
The KSZ8051MLL devices are configured to MII Back-to-Back mode after power-up or reset with the following:
July 2010
•
•
•
Strapping pin CONFIG[2:0] (pins 27, 41, 40) set to ‘110’
A common 25MHz reference clock connected to XI (pin 15)
MII signals connected as shown in Table 2.
Pin Name
RXDV
RXD3
RXD2
RXD1
RXD0
TXEN
TXD3
TXD2
TXD1
TXD0
Table 2. MII Signal Connection for MII Back-to-Back Mode (100Base-TX Copper Repeater)
RXC
TXC
KSZ8051MLL (100Base-TX copper)
Figure 3. KSZ8051MLL and KSZ8041FTL Back-to-Back Media Converter
Pin Number
[Device 1]
28
27
20
21
22
23
33
34
39
38
36
35
Pin Type
Output
Output
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
19
Pin Name
RXDV
TXEN
TXD3
TXD2
TXD1
TXD0
RXD3
RXD2
RXD1
RXD0
RXC
TXC
KSZ8051MLL (100Base-TX copper)
Pin Number
[Device 2]
33
34
39
38
36
35
28
27
20
21
22
23
Pin Type
Output
Output
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
M9999-071210-1.0
KSZ8051MLL