KS8999_11 MICREL [Micrel Semiconductor], KS8999_11 Datasheet - Page 24

• Manufacturer Part Number: KS8999_11
• Description: Integrated 9-Port 10/100 Switch with PHY and Frame Buffer
• Manufacturer: MICREL [Micrel Semiconductor]

January 2005
Micrel, Inc.
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
KS8999 MAC Mode
Figure 3. Data Sent from External MAC Controller to KS8999 PHY Mode
Figure 6. Data Sent from KS8999 PHY Mode to External PHY Device
Figure 4. Data Sent from PHY Mode to External MAC Controller
Figure 5. Data Sent from PHY Device to KS8999 MAC Mode
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