 |
|||||||
|
|||||||
|
|
|||||||
|
|||||||
|
|
| mc68qh302pv20c资料 | |
|
mc68qh302pv20c |
|
file size : 116 kb
manufacturer: description:3.6 link test and jabber logic the link test circuit performs the necessary link test functions specified by ieee 802.3. the link test function is enabled when lte/ls is sampled high during reset period. if the link test function is enabled, the lte/ls pin becomes an output that can drive the link led display. to disable the link test function, lte should be tied low. the link test function can be changed only by power-on and off. note that if the link test is disabled, the generation of link pulses is not affected. the link test status is used to control the on-chip utp transceiver and the media selection. if the link test fails, and auto detection mode is enabled, the media is set to aui. the link test circuit also includes the polarity detection function. detection is based on the polarity of received link pulses. if 8 consecutive reversed link pulses are received, the polarity is toggled. the jabber logic monitors the length of the continuous transmission time. if the transmission time exceeds the maximum jabber time, the transmission is disabled and col is asserted to indicate the jabber status. in addition, the logic implements the heartbeat function. the heartbeat enable signal is latched during reset period from the col pin. to enable the heartbeat function, an external pull-up resistor of 4.7k ohms should be connected to the col pin. to disable the heartbeat function, a pull-down resistor should be used. |
|
| 1pcs | 100pcs | 1k | 10k | ||
|
型 号：mc68qh302pv20c 厂 家： 封 装：0611 批 号： 数 量：2580 说 明： |
|||||
|
运 费： 所在地： 新旧程度： |
|||||
| 联系人：林浩/林妮 |
| 电 话：0755-82532799/82532766/83989559 |
| 手 机：13510168121/13725556003 |
| qq：496982847/351622092 |
| msn：linearic@hotmail.com |
| 传 真：0755-82532766 |
| email：maxim_zi@126.com |
| 公司地址： 深圳市福田区佳和大厦b座1802室 门市部：华强广场 q2a114展销柜 |
凯发vip的版权所有：深圳市浩兴电子有限公司凯发vip的版权所有 凯发vip的技术支持：维库电子市场网
访问统计：
建议使用分辨率:1024*768 凯发在线网站的友情链接
后台管理
