on versions can not tell you anything I’ve worked on a 1.1.
INTn is the output pin driven by interrupts and that is set as the duration from the register
INTLEVEL (Low Level Timer Interrupt Register) [R / W] [0x0013 - 0x0014] [0x0000]
and as event from
IR (Interrupt Register) [R / W] [0x0015] [0x00]
IMR (Interrupt Mask Register) [R / W] [0x0016] [0x00]
You can find out how to use this pin on the datasheet W5500 starting on page 35.
RDY is an output and is high after a reset and indicates when the device is ready.
Normally a pending 1000/1200 mSec from reset allows you to avoid using an MPU pin to see this state.
To connect to Aduino serve signals MISO, MOSI, SCK, RST and SS while on where to connect depends on libraries since they can use both D10/D12 that the central 6-pin ICSP connector. I have made a shield for a home-made MPU PIC ( http://www.firewing.info/pmwiki.php?n=FirewingUser.W5500) using the same pin-out of the Arduino and D10/D12 signals version but the software would not know.