Datasheet

20 / 66 W5500 Datasheet Version1.0.9
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] = ‘00’
1
st
Data = 0x11
2
nd
Data = 0x22
3
rd
Data = 0x33
4
th
Data = 0x44
5
th
Data = 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.
Figure 10. 5 Byte Data Write at 1th Socket’s TX Buffer Block 0x0040 in VDM mode
SCSn
SCSn