DPC=B_0x0, EIE=B_0x0, WRIE=B_0x0, EN=B_0x0, RDIE=B_0x0
MDIOS configuration register
| EN | peripheral enable 0 (B_0x0): MDIOS is disabled. 1 (B_0x1): MDIOS is enabled and monitoring the MDIO bus (MDC/MDIO).  |  
| WRIE | register write interrupt enable 0 (B_0x0): Interrupt is disabled. 1 (B_0x1): Interrupt is enabled.  |  
| RDIE | register read interrupt enable 0 (B_0x0): Interrupt is disabled. 1 (B_0x1): Interrupt is enabled.  |  
| EIE | error interrupt enable 0 (B_0x0): Interrupt is disabled. 1 (B_0x1): Interrupt is enabled.  |  
| DPC | disable preamble check 0 (B_0x0): MDIO master must give preamble before each frame. 1 (B_0x1): MDIO master can send each frame without a preceding preamble, and the MDIOS does not signal a preamble error.  |  
| PORT_ADDRESS | slave address  |