參數(shù)資料
型號(hào): KSZ8721BLI TR
廠商: Micrel Inc
文件頁(yè)數(shù): 7/35頁(yè)
文件大?。?/td> 0K
描述: TXRX PHY 10/100 2.3.3/5V 48-LQFP
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: MII,RMII
電源電壓: 3 V ~ 3.6 V
安裝類型: 表面貼裝
封裝/外殼: 48-LQFP
供應(yīng)商設(shè)備封裝: 48-LQFP(7x7)
包裝: 帶卷 (TR)
配用: 576-1627-ND - BOARD EVALUATION FOR KSZ8721BMC
576-1626-ND - BOARD EVALUATION FOR KSZ8721BL
其它名稱: KSZ8721BLITR
KSZ8721BLITR-ND
Micrel, Inc.
KS8721BL/SL
June 2009
15
M9999-062509-1.3
RMII AC Characteristics
Symbol
Parameter
Min
Typ
Max
Units
REF_CLK Frequency
50
MHz
REF_CLK Duty Cycle
35
65
%
tSU
TXD[1:0], TX_EN, RXD[1:0], CRS_DV, RXER
4
ns
tH
TXD[1:0], TX_EN, RXD[1:0], CRS_DV, RXER
Data Hold from REF_CLK
Rising Edge
2
ns
Unused RMII Pins
Input Pins
TXD[2:3] and TXER are pull-down to GND.
Output Pins
RXD[2:3] and RXC are no connect.
Note that the RMII pin needs to be pulled up to enable RMII mode.
Auto-Crossover (Auto-MDI/MDI-X)
Automatic MDI/MDI-X conguration is intended to eliminate the need for crossover cables between similar devices. The
assignment of pinouts for a 10/100 BASE-T crossover function cable is shown below.
This feature eliminates the confusion in applications by allowing the use of both straight and crossover cables. This
feature is controlled by register 1f:13. See “Register 1fh–100BASE-TX PHY Controller” section for details.
10/100 BASE-T
Media Dependent Interface
10/100 BASE-T
Media Dependent Interface
Transmit Pair
Receive Pair
Transmit Pair
Receive Pair
Modular Connector (RJ45)
NIC
Modular Connector (RJ45)
HUB
(Repeater or Switch)
Figure 1. Straight Through Cable
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