W5500 Datasheet, PDF (20/65 Pages) List of Unclassifed Manufacturers – Supports 8 independent sockets simultaneously

N-Bytes WRITE Access Example
When the Host writes 5 Bytes Data (0x11, 0x22, 0x33, 0x44, 0x55) to Socket 1‟s TX
Buffer Block 0x0040 Address by using VDM mode, 5 bytes data are written with the SPI
Frame below.
Offset Address = 0x0040
BSB[4:0]
= ‘00110’
RWB
= ‘1’
OM[1:0]
1^st Data
2^nd Data
3^rd Data
4^th Data
5^th Data
= ‘00’
= 0x11
= 0x22
= 0x33
= 0x44
= 0x55
The N-Bytes Write Access is shown in Figure 10.
The 5 bytes of Data (0x11, 0x22, 0x33, 0x44, 0x55) are written sequentially to
Socket 1‟s Tx Buffer Block Address 0x0040 ~ 0x0044.
The External Host asserts (High-to-Low) SCSn before transmitting SPI Frame.
The External Host de-asserts (Low-to-High) the SCSn at the end of SPI Frame
transmit.
SCSn
SCSn
Figure 10. 5 Byte Data Write at 1th Socket‟s TX Buffer Block 0x0040 in VDM mode
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W5500 Datasheet Version1.0 (August 2013)