RMII Back-to-Back Mode (KSZ8041TL/FTL only) In RMII Back-to-Back mode, the KSZ" />
參數(shù)資料
型號： KSZ8041MLL TR
廠商： Micrel Inc
文件頁數(shù)： 33/65頁
文件大?。?/td> 0K
描述： TXRX 10/100 3.3V PHY MII 48LQFP
標(biāo)準(zhǔn)包裝： 1,000
類型： 收發(fā)器
驅(qū)動器/接收器數(shù)： 1/1
規(guī)程： MII
電源電壓： 3.135 V ~ 3.465 V
安裝類型： 表面貼裝
封裝/外殼： 48-TQFP
供應(yīng)商設(shè)備封裝： 48-TQFP（7x7）
包裝： 帶卷 (TR)
Micrel, Inc.
KSZ8041TL/FTL/MLL
December 2009
39
M9999-120909-1.2
RMII Back-to-Back Mode (KSZ8041TL/FTL only)
In RMII Back-to-Back mode, the KSZ8041TL interfaces with another KSZ8041TL, or a KSZ8041FTL to provide a complete
100Mbps repeater or media converter solution. The KSZ8041TL/FTL devices are configured to RMII Back-to-Back mode
after they are power-up or reset with the following:
x
CONFIGURATION[2:0] (pins 27, 41, 40) set to ‘101’
x
A common 50MHz reference clock connected to REFCLK (pin 15)
x
RMII signals connected as shown in the following table.
KSZ8041TL (100Base-TX copper)
KSZ8041FTL (100Base-FX fiber)
Pin Name
Pin Number
Pin Type
Pin Name
Pin Number
Pin Type
CRSDV
27
Output
TXEN
34
Input
RXD1
22
Output
TXD1
36
Input
RXD0
23
Output
TXD0
35
Input
TXEN
34
Input
CRSDV
27
Output
TXD1
36
Input
RXD1
22
Output
TXD0
35
Input
RXD0
23
Output
Table 13. RMII Signal Connection for RMII Back-to-Back Mode
RMII Back-to-Back mode provides an option to disable the fiber side when the copper side is down. This, effectively,
produces a link fault propagation for media converter applications, such that a copper side link down will automatically
disable the fiber side. This KSZ8041TL/FTL feature functions as follows:
x
On the KSZ8041TL copper side, RXD2 (pin 21) indicates if there is energy detected at the receive inputs of the
copper port. RXD2 outputs a low if there is no energy detected (cable disconnected), and outputs a high if there is
energy detected (cable connected).
x
The RXD2 output of the KSZ8041TL copper side drives the input of an inverter, and the output of the inverter
drives the TXD2 (pin 38) input of the KSZ8041FTL fiber side. The fiber side transmitter is disabled if the TXD2
input is high.
The TXD3 and TXD2 pins should be pulled down with 1K resistors, and RXD3 and RXD2 pins should be left floating, if
they are not used.
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