RFID+ENC28J60 Arduino Mega

Using Arduino Programming Questions
1

I'm working on RFID Reader and ENC28J60 Ethernet Module on Arduino Mega.It may sound easy but there's one complicated question.RFID Reader uses 50-52 and ENC28J60 have to use them too.Connection is like:
-------RFID-----------
SDA D9
SCK D52
MOSI D51
MISO D50
IRQ NC
GND GND
RST D8
3.3V 3.3V
------ENC28J60---------
GND GND
3.3 3.3V
SO Pin50
SI Pin51
SCK Pin52
CS Pin53

I'm sure but will there be any problem? Any advice

2

Serial Peripheral Interface (SPI) is a synchronous serial data protocol used by microcontrollers for communicating with one or more peripheral devices - so as long as everyone does the right thing on the bus, you’ll be fine

Read about SPI

3

SO is MISO
SI is MOSI

SDA doesn't fit to SPI. is it CS pin?

SPI is a bus. more devices can connect. CS pin determines, which slave device should listen and answer. slave devices with CS HIGH should be silent.