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| 型号： | GT-48006A |
| 厂商： | Galileo Technology Services, LLC |
| 英文描述： | Low Cost Two Port 10/100Mbps Ethernet Bridge/Switch Controller(低成本、双端口10/100Mbps以太网桥式/交换式控制器) |
| 中文描述： | 低成本双口10/100Mbps以太网桥/开关控制器（低成本，双端口10/100以太网桥式/交换式控制器） |
| 文件页数： | 13/33页 |
| 文件大小： | 352K |
| 代理商： | GT-48006A |
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GT-48006A Low Cost Two Port 10/100 Ethernet Bridge/Switch Controller
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Table 8: MDIO Signal Timings (PHY Driving MDIO)
10.2
Link Detection and Link Detection Bypass (ForceLinkPass*)
Typically, the GT-48006A will continuously query the PHY devices for its link status. The predefined PHY addresses for
the link query are 1 and 2 (out of possible 32 addresses). The GT-48006A will alternately read register 1 from PHY1
and PHY2 and update the internal link bits according to the value of bit 2 of register 1. In the case of “link is down” (i.e.
bit 2 is ‘0’), that port will enter link test fail state. In this state, all of the port’s logic is reset. The port will exit from link test
fail state only when the “link is up” i.e. bit 2 of register 1 is read from the port’s PHY as ‘1’.
The GT-48006A offers the option to disable the link detection mechanism by forcing the link state of both ports to the
link test pass state regardless of the PHY’s link bit value. This is done with the LEDStb pin, which is sampled at RESET
(see Table 1 on page 7).
GT-48006A
I E E E 80 2 . 3u S p ec .
Na m e
Pa ra m e te r
MI N
MAX
MI N
MAX
Un its
t5
Setup Time to Rising MDC
10
ns
t6
Hold Time after Rising MDC
10
ns
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