Datasheet

Micrel, Inc. KS8999

January 2005

KS8999

Note that the signal MRXER is not provided on the MII interface for the KS8999 for PHY mode operation and MTXER

is not represented for MAC mode. Normally this would indicate a receive / transmit error coming from the physical

layer /MAC device, but is not appropriate for this configuration. If the connecting device has a MRXER pin, this

should be tied low on the other device for reverse or if it has a MTXER pin in the forward mode it should also be tied

low on the other device.

The following explains the KS8999 in PHY mode and MAC mode of operation:

KS8999 PHY Mode

Figure 3. Data Sent from External MAC Controller to KS8999 PHY Mode

Figure 4. Data Sent from PHY Mode to External MAC Controller

KS8999 MAC Mode

Figure 5. Data Sent from PHY Device to KS8999 MAC Mode

Figure 6. Data Sent from KS8999 PHY Mode to External PHY Device