W5500 Datasheet, PDF (26/65 Pages) List of Unclassifed Manufacturers – Supports 8 independent sockets simultaneously

2.4.2 Read Access in FDM
1 Byte READ Access
Figure 17. 1 Byte Data Read SPI Frame in FDM mode
2 Bytes READ Access
Figure 18. 2 Bytes Data Read SPI Frame in FDM mode
4 Bytes READ Access
Figure 19. 4 Bytes Data Read SPI Frame in FDM mode
26 / 65
W5500 Datasheet Version1.0 (August 2013)