A method and apparatus for fine tuning a memory interface includes receiver operative to receive an input signal. The method and apparatus includes a clock counter operative to calculate a time value based upon the timed sequence determined by the reception of the input signal. The method and apparatus further includes a comparator coupled to receive an input strength indicator signal from the receiver and operative to generate a comparative strength signal based on the comparison of the input signal strength indicator signal and a reference strength signal. Furthermore, the method and apparatus includes a tuner coupled to the clock counter so the tuner receives the time value from the counter, and coupled to the comparator to receive the comparative strength signal from the comparator, whereupon the tuner then generates a tuning signal utilized for an iterative tuning process to fine tune a memory interface.

There is provided a testing apparatus including: a pattern generator that generates an address signal and a data signal to be supplied to a plurality of memories under test and an expectation signal; a plurality of logic comparators that generate fail data when an output signal output from the plurality of memories under test and the expectation signal are not identical with each other; a plurality of fail memories that store the fail data generated from the plurality of logic comparators; a plurality of memory controllers that generate bad address information showing a bad address in the memory under test based on the fail data stored on the plurality of fail memories; a plurality of universal buffer memories that store the bad address information generated from the plurality of memory controllers; and a plurality of bad information writing sections that concurrently write bad information into the bad address in the plurality of memories under test, which is shown by the bad address information stored on the plurality of universal buffer memories.