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| 型号： | WBLXT975BHCA8 |
| 厂商： | CORTINA SYSTEMS INC |
| 元件分类： | 网络接口 |
| 英文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP160 |
| 封装： | ROHS COMPLIANT, PLASTIC, MS-002DD-1, HQFP-160 |
| 文件页数： | 31/76页 |
| 文件大小： | 1004K |
| 代理商： | WBLXT975BHCA8 |
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Fast Ethernet 10/100 Quad Transceivers — LXT974/LXT975
Datasheet
37
The LXT974/975 does not support fiber connections at 10 Mbps.
2.6.2.1
Preamble Handling
In 10BASE-T Mode, the LXT974/975 strips the entire preamble off of received packets. CRS is
asserted a few bit times after carrier is detected. RX_DV is held Low for the duration of the
preamble.
When RX_DV is asserted, the very first two nibbles driven by the LXT974/975 are the SFD “5D”
hex followed by the body of the packet. In 10T loopback, the LXT974/975 loops back whatever
the MAC transmits to it, including the preamble.
2.6.2.2
Link Test
In 10 Mbps mode, the LXT974/975 always transmit link pulses. If the link test function is enabled,
it monitors the connection for link pulses. Once link pulses are detected, data transmission are
enabled and remain enabled as long as either the link pulses or data transmission continues. If the
link pulses stop, the data transmission is disabled.
If the link test function is disabled, the LXT974/975 transmits to the connection regardless of
detected link pulses. The link test function can be disabled by setting bit 19.8 = 1 or by setting
AUTOENA to disable auto-negotiation and setting CFG_1 input High.
2.6.2.3
Link Failure
Link failure occurs if Link Test is enabled and link pulses or packets stop being received. If this
condition occurs, the LXT974/975 returns to the auto-negotiation phase if auto-negotiation is
enabled.
2.6.2.4
SQE (Heartbeat)
By default, the SQE (heartbeat) function is disabled on the LXT974/975. To enable this function,
set bit 19.10 =1. When this function is enabled, the LXT974/975 asserts its COL output after each
transmit packet. See Figure 32 on page 58 for SQE timing parameters.
2.6.2.5
Jabber
If MAC transmission exceeds the jabber timer, the LXT974/975 disables the transmit and loopback
functions and enables the COL pin. See Figure 33 on page 59 for jabber timing parameters.
The LXT974/975 automatically exits jabber mode after the unjab time has expired. This function
can be disabled by setting bit 19.9 = 1.
2.7
LED Functions
The LXT974/975 provides three programmable LEDs per port. Refer to Table 51 on page 68 for
LED programming details. The LXT974/975 also provides a serial LED output.
相关PDF资料 |
PDF描述 |
|---|---|
| WBLXT974BHCA8 | DATACOM, ETHERNET TRANSCEIVER, PQFP160 |
| WBLXT974BHCA8 | DATACOM, ETHERNET TRANSCEIVER, PQFP160 |
| WBLXT9785EHC.C2V | DATACOM, INTERFACE CIRCUIT, PQFP208 |
| WBLXT9785EHC.D0-865110 | DATACOM, INTERFACE CIRCUIT, PQFP208 |
| WBLXT9785EHC.D0-865111 | DATACOM, INTERFACE CIRCUIT, PQFP208 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| WBLXT9785EHC.D0865110 | 功能描述:IC TXRX 8PORT ETHERNET 208-HQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| WBLXT9785EHC.D0-865110 | 制造商:Cortina Systems Inc 功能描述:PHY 8-CH 10Mbps/100Mbps 208-Pin PQFP |
| WBLXT9785EHC.D0-865111 | 制造商:Cortina Systems Inc 功能描述:PHY 8-CH 10Mbps/100Mbps 208-Pin PQFP |
| WBLXT9785HC.D0 | 功能描述:IC TXRX 8PORT ETHERNET 208-HQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,000 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| WBLXT9785HC.D0-865112 | 功能描述:TXRX ETH OCT LP COMM 208-HQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 产品目录页面:1402 (CN2011-ZH PDF) |
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