參數(shù)資料
型號(hào): KSZ8021RNL
廠商: Micrel Inc
文件頁(yè)數(shù): 10/43頁(yè)
文件大?。?/td> 0K
描述: TXRX PHY 100BASE TX 3.3V 24QFN
標(biāo)準(zhǔn)包裝: 75
類型: PHY 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù): 1/1
規(guī)程: RMII
電源電壓: 1.8V,2.5V,3.3V
安裝類型: 表面貼裝
封裝/外殼: 24-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 24-QFN 裸露焊盤(4x4)
包裝: 管件
其它名稱: 576-3740-5
Micrel, Inc.
KSZ8021RNL / KSZ8031RNL
August 2010
18
M9999-082710-1.0
Back-to-Back Mode – 100Mbps Copper Repeater / Media Converter
Two KSZ8021/31RNL devices can be connected back-to-back to form a managed 100Base-TX copper repeater.
A KSZ8021/31RNL and a KSZ8041FTL can be connected back-to-back to provide a managed 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.
Figure 4. KSZ8021/31RNL and KSZ8041FTL RMII Back-to-Back Media Converter
RMII Back-to-Back Mode
In RMII Back-to-Back mode, a KSZ8021/31RNL interfaces with another KSZ8021/31RNL, or a KSZ8041FTL to provide a
100Mbps copper repeater, or media converter solution, respectively.
The KSZ8021/31RNL devices are configured to RMII Back-to-Back mode after they are powered up or hardware reset
and software programmed with the following:
A common 50MHz reference clock connected to XI (Pin 8)
Register 1Fh, bit [7] programmed to ‘1’ to select RMII – 50MHz Clock Mode for KSZ8031RNL
(KSZ8021RNL is set to RMII – 50MHz Clock Mode as the default after power up or hardware reset)
Register 16h, bits [6] and [1] programmed to ‘1’ and ‘1’, respectively, to enable RMII Back-to-Back mode.
RMII signals connected as shown in the following table.
KSZ8021/31RNL (100Base-TX copper)
[Device 1]
KSZ8021/31RNL (100Base-TX copper)
[Device 2]
Pin Name
Pin Number
Pin Type
Pin Name
Pin Number
Pin Type
CRS_DV
15
Output
TXEN
19
Input
RXD1
12
Output
TXD1
21
Input
RXD0
13
Output
TXD0
20
Input
TXEN
19
Input
CRS_DV
15
Output
TXD1
21
Input
RXD1
12
Output
TXD0
20
Input
RXD0
13
Output
Table 2. RMII Signal Connection for RMII Back-to-Back Mode (100Base-TX Copper Repeater)
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KSZ8031RNL TR 功能描述:以太網(wǎng) IC 3.3V, 10Base-T/100Base-TX Physical Layer Transceiver w/ RMII Support (24-QFN) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray