An apparatus and method are provided for accessing a serial memory without
knowing the required number of address bits. The apparatus comprises a
pull circuit, a data out control circuit and a transition detector. The
pull circuit causes the input terminal to be set to a first predetermined
logic state in response to a read command being provided to the serial
memory. The data out control circuit has an output terminal for providing
the read command and a first predetermined number of address bits to the
output terminal. The transition detector is coupled to an input terminal
for detecting if the input terminal transitions from the first
predetermined logic state to a second predetermined logic state in
response to the first predetermined number of address bits. The
transition detector will detect a transition of the input terminal when a
correct number of address bits have been provided.