Acknowledge; Bit Command Controller; Figure 48. Bit Conditions - Wiznet W7500 Reference Manual

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Acknowledge

All bus transactions have a required acknowledge clock cycle that is generated by the master.

During the acknowledge cycle, the transmitter cannot operate the next operation.

The Bit command Controller handles the actual transmission of data and the generation of

the specific levels for START, STOP and Repeated START signals by controlling the SCL and

SDA lines. The Byte Command controller tells the Bit command Controller which operation

has to be performed. For a single byte read, the Bit command Controller receives 8 separate

read command. Each bit-operation is divided into 5 pieces (idle and A,B,C,and D) except for

a STOP operation which is divided into 4 pieces(idle and A, B,C)

21.3.3.1 START and STOP Conditions

The protocol of the ��

A High to Low transition on the SDA line while SCL is High is one unique case and indicates a

START condition. A Low to High transition on the SDA line while SCL is high defines a STOP

W7500 Datasheet Version1.0.0

bus defines two states to START and STOP conditions.