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LAN8720AI 参数 Datasheet PDF下载

LAN8720AI图片预览
型号: LAN8720AI
PDF下载: 下载PDF文件 查看货源
内容描述: 小尺寸RMII 10/100以太网收发器, HP Auto-MDIX的支持 [Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support]
分类和应用: 以太网局域网(LAN)标准
文件页数/大小: 79 页 / 1119 K
品牌: SMSC [ SMSC CORPORATION ]
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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support  
Datasheet  
Table 2.1 RMII Signals (continued)  
BUFFER  
TYPE  
NUM PINS  
NAME  
SYMBOL  
DESCRIPTION  
Carrier Sense  
/ Receive  
Data Valid  
CRS_DV  
VO8  
This signal is asserted to indicate the receive  
medium is non-idle. When a 10BASE-T packet is  
received, CRS_DV is asserted, but RXD[1:0] is  
held low until the SFD byte (10101011) is  
received.  
Note:  
Per the RMII standard, transmitted data  
is not looped back onto the receive data  
pins in 10BASE-T half-duplex mode.  
1
PHY  
Operating  
Mode 2  
Configuration  
Strap  
MODE2  
VIS  
(PU)  
Combined with MODE0 and MODE1, this  
configuration strap sets the default PHY mode.  
See Note 2.1 for more information on  
configuration straps.  
Note:  
Refer to Section 3.7.2, "MODE[2:0]:  
Mode Configuration," on page 31 for  
additional details.  
Note 2.1 Configuration strap values are latched on power-on reset and system reset. Configuration  
straps are identified by an underlined symbol name. Signals that function as configuration  
straps must be augmented with an external resistor when connected to a load. Refer to  
Section 3.7, "Configuration Straps," on page 31 for additional information.  
Table 2.2 LED Pins  
BUFFER  
NUM PINS  
NAME  
SYMBOL  
TYPE  
DESCRIPTION  
LED 1  
LED1  
O12  
Link activity LED Indication. This pin is driven  
active when a valid link is detected and blinks  
when activity is detected.  
Note:  
Refer to Section 3.8.1, "LEDs," on  
page 37 for additional LED information.  
Regulator Off  
Configuration  
Strap  
REGOFF  
IS  
(PD)  
This configuration strap is used to disable the  
internal 1.2V regulator. When the regulator is  
disabled, external 1.2V must be supplied to  
VDDCR.  
„ When REGOFF is pulled high to VDD2A with  
an external resistor, the internal regulator is  
disabled.  
1
„ When REGOFF is floating or pulled low, the  
internal regulator is enabled (default).  
See Note 2.2 for more information on  
configuration straps.  
Note:  
Refer to Section 3.7.3, "REGOFF:  
Internal +1.2V Regulator Configuration,"  
on page 32 for additional details.  
SMSC LAN8720A/LAN8720Ai  
11  
Revision 1.4 (08-23-12)  
DATASHEET