參數(shù)資料
型號： KSZ8041FTLI TR
廠商： Micrel Inc
文件頁數(shù)： 28/58頁
文件大?。?/td> 0K
描述： TXRX PHY 10/100 SGL LP 48TQFP
標(biāo)準(zhǔn)包裝： 1,000
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 1/1
規(guī)程： SMII
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
April 2007
34
M9999-042707-1.1
RMII Back-to-Back Mode
The KSZ8041FTL and KSZ8041TL are configured in RMII Back-to-Back mode after it is power-up or reset with the
following:
CONFIG[2:0] (pins 27, 41, 40) set to ‘101’ for both KSZ8041FTL and KSZ8041TL.
A common 50 MHz reference clock connected to REFCLK (pin 15) of both KSZ8041FTL and KSZ8041TL.
RMII signals connected as shown in the following table between KSZ8041FTL in fiber mode and KSZ8041TL in
copper mode.
KSZ8041FTL in fiber mode
KSZ8041TL in copper mode
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 the option to disable and tri-state the transmitter on both copper and fiber sides if the
cable is disconnected on the copper side. On the copper side, RXD2 (pin 21) indicates if there is energy detected at the
receive inputs of the UTP port. RXD2 outputs a low if there is no energy detected (cable disconnected), and outputs a
high if there is energy detected (cable connected). The RXD2 output is connected thru an inverter to drive TXD2 (pin 38)
input high to disable and tri-state the transmitters for both copper and fiber sides.
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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