Z80 interface to the WIZ830MJ module

I bought several WIZ830MJ modules, but cannot get them working with the Z80 in 8 bit mode. I’m using I/O instructions to read and write to the port that has the WIZ830MJ attached. I always get 0x00 back and cannot change any bit. I’m new to the WIZ830MJ module and any feedback is appreciated to get this working.

First, Read the IDR register of W5300.
IDR value should be 0x5300.

Second, Write SHAR regsiter and Read it.

If Two test is OK, you can port W5300’s 8bit driver source code.
Wiznet provide the AVR example as 8-bit driver on Homepage.

Thank you.