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參數資料
| 型號： | DJLXT972MQEA4 |
| 廠商： | Intel Corp. |
| 英文描述： | Single-Port 10/100 Mbps PHY Transceiver |
| 中文描述： | 單端口10/100 Mbps的物理層收發器 |
| 文件頁數： | 54/92頁 |
| 文件大小： | 666K |
| 代理商： | DJLXT972MQEA4 |
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Intel
LXT972M Single-Port 10/100 Mbps PHY Transceiver
54
Datasheet
Document Number: 302875-005
Revision Date: 27-Oct-2005
5.9.4
LED Pulse Stretching
The LED Configuration Register also provides optional LED pulse stretching to 30, 60, or 100 ms.
The pulse stretch time is extended further if the event occurs again during this pulse stretch period.
When an event such as receiving a packet occurs, the event is edge detected and it starts the stretch
timer. The LED driver remains asserted until the stretch timer expires. If another event occurs
before the stretch timer expires, then the stretch timer is reset and the stretch time is extended.
When a long event (such as duplex status) occurs, the event is edge detected and it starts the stretch
timer. When the stretch timer expires, the edge detector is reset so that a long event causes another
pulse to be generated from the edge detector, which resets the stretch timer and causes the LED
driver to remain asserted.
Figure 18
shows how the stretch operation functions.
Figure 18. LED Pulse Stretching
Event
LED
Note: The direct drive LED outputs in this diagram are shown as active Low.
stretch
stretch
stretch
B3475-01
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