Wiznet WIZ610io User Manual page 7

< Address and OP/DATA Length Sequence Diagram >
3.2 Read processing
The READ processing is entered by driving nSCS low, followed by the Address,
the OP code, the Data Length and the Data byte on MOSI. The OP code (OP) is
defined type of the READ OP and WIRTE OP. On OP = 0, the read operation is
selected. Otherwise, On OP = 1, the write operation is selected.
In W6100 SPI mode, the Byte READ processing and the burst READ processing
are provided. The Byte READ processing takes 4 instructions which is consist of
the 16-bit Address, the 1-bit OP code(0x0), the 15-bit Data length and 8-bit Data.
Otherwise, The Burst READ processing only takes the Data instruction after the
setting of the burst read processing. To distinguish between the Byte READ and
the burst READ processing, the Data length is used. If the Data length is '1,' the
Byte READ processing is operated. Otherwise, the Burst READ Processing is
operated when the Data length is more than two. The MISO pin should be
selected by driving MISO low after the falling edge of the nSCS.
WIZ610io User Manual (WIZnet Co.,Ltd.)
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