ksz8021rnli Micrel Semiconductor, ksz8021rnli Datasheet - Page 17

• Manufacturer Part Number: ksz8021rnli
• Description: 10base-t/100base-tx Phy With Rmii Support
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
RMII – 50MHz Clock Mode
The KSZ8021RNL is configured to RMII – 50MHz Clock Mode after it is powered up or hardware reset with the following:
The KSZ8031RNL is configured optionally to RMII – 50MHz Clock Mode after it is powered up or hardware reset and
software programmed with the following:
August 2010
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An external 50MHz clock source (oscillator) connected to XI (Pin 8)
An external 50MHz clock source (oscillator) connected to XI (Pin 8)
Register 1Fh, bit [7] programmed to ‘1’ to select RMII – 50MHz Clock Mode
Figure 3. KSZ8021/31RNL RMII Interface (RMII – 50MHz Clock Mode)
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KSZ8021RNL / KSZ8031RNL
M9999-082710-1.0