KSZ8041TLI-S Micrel, KSZ8041TLI-S Datasheet - Page 33

• Manufacturer Part Number: KSZ8041TLI-S
• Description: Ethernet ICs Physical Layer Transceiver 10/100BASE-FX (Lead Free)
• Manufacturer: Micrel

Specifications of KSZ8041TLI-S

• Rohs: yes
• Product: Ethernet Transceivers
• Package / Case: TQFP-48
• Mounting Style: SMD/SMT

Micrel, Inc.
Back-to-Back Media Converter
A KSZ8041FTL and a KSZ8041TL can be connected back-to-back to provide a low cost media converter solution. In
back-to-back mode, media conversion is between 100Base-FX fiber and 100Base-TX copper. On the copper side, link up
at 10Base-T is not allowed, and is blocked during auto-negotiation.
The KSZ8041FTL and KSZ8041TL support MII Back-to-Back mode and RMII Back-to-Back mode for media conversion.
MII Back-to-Back Mode
The KSZ8041FTL and KSZ8041TL are configured in MII Back-to-Back mode after it is power-up or reset with the following:
April 2007
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CONFIG[2:0] (pins 27, 41, 40) set to ‘110’ for both KSZ8041FTL and KSZ8041TL.
A common 25 MHz reference clock connected to XI (pin 15) of both KSZ8041FTL and KSZ8041TL.
MII signals connected as shown in the following table between KSZ8041FTL in fiber mode and KSZ8041TL in
copper mode.
Pin Name
RXDV
RXD3
RXD2
RXD1
RXD0
TXEN
TXD3
TXD2
TXD1
TXD0
RXC
TXC
KSZ8041FTL in fiber mode
Figure 10. KSZ8041FTL / KSZ8041TL Back-to-Back Media Converter
Pin Number
Table 12. MII Signal Connection for MII Back-to-Back Mode
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
33
Pin Name
RXDV
TXEN
TXD3
TXD2
TXD1
TXD0
RXD3
RXD2
RXD1
RXD0
RXC
TXC
KSZ8041TL in copper mode
Pin Number
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
M9999-042707-1.1
KSZ8041TL/FTL