KX-MB283RU, KX-MB783RU (serv.man3) - Panasonic Fax Service Manual Supplement (repair manual). Page 15

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1. P = Power supply.

Gnd = Ground.
I = Input.
O = Output.
I/O = Bi-directional.
Ipd = Input with internal pull-down (40K +/-30%).
Ipu = Input with internal pull-up (40K +/-30%).
Opu = Output with Internal pull-up (40K +/-30%).
Ipu/O = Input with internal pull-up (40K +/-30%) during power-up/reset; output pin otherwise.
lpd/O = Input with internal pull-down (40K +/-30%) during power-up/reset; output pin otherwise.

2. MII Rx Mode: The RXD[3..0] bits are synchronous with RXCLK. When RXDV is asserted, RXD[3..0] presents valid data to

MAC through the MII. 
RXD[3..0] is invalid when RXDV is de-asserted.

3. RMII Rx Mode: The RXD[1:0] bits are synchronous with REF_CLK. For each clock period in which CRS-DV is asserted, two

bits of recovered data are sent from the PHY.

4. MII Tx Mode: The TXD[3..0] bits are synchronous with TXCLK. When TXEN is asserted, TXD[3..0] presents valid data from

the MAC through the MII. TXD[3..0] has no effect when TXEN is de-asserted.

5. RMII Tx Mode: The TXD[1:0] bits are synchronous with REF_CLK. For each clock period in which TX_EN is asserted, two bits

of data are received by the PHY from the MAC.