參數(shù)資料
型號(hào)： LXT9863HC
英文描述： LAN HUB CONTROLLER
中文描述： 局域網(wǎng)集線器控制器
文件頁數(shù)： 39/96頁
文件大?。?/td> 1309K
代理商： LXT9863HC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
Datasheet
39
2.5.3
MII Port Timing Considerations
The IEEE 802.3u specification provides propagation delay constraints for standard PHY devices in
Section 24.6, and for repeater devices in Section 27. The LXT980 MII port is a hybrid that does not
fit either of these categories. The critical consideration that applies to the LXT980 MII port is the
overall end-to-end system propagation delay (132 bit times maximum). The LXT980 supports the
intent of the Class II repeater application.
Figure 9
and
“
Serial Management I/F
”
summarizes the
propagation delay issues relevant to the LXT980 MII port.
The LXT980 architecture treats the MII port as a fifth repeater port. The timing delay (latency)
from the MII port to any other port meets the requirements for a Class II repeater (
≤
46 BT). It does
not meet the requirements for a standard MII-PHY interface (20 - 24 BT). When operating in MAC
mode with a PHY connected to the LXT980 MII port (
Figure 9B
), the fifth TP port does not have
the latency characteristics of a Class II repeater with respect to the other ports.
With a MAC connected to the LXT980 MII port (
Figure 9D
), the maximum latency to any other
MAC is 112 BT (not including cable delay). The MAC connected to the LXT980 has an advantage
relative to other MACs because it has one less transceiver delay.
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