An apparatus and method provides prediction of BER for an interface
between ICs, such as a processor and a memory device, without using
special test equipment. A known data pattern or PRBS is transmitted to a
receiver, which compares the received data values with expected data
values to determine if a bit error has occurred in an embodiment of the
present invention. A center of data eye and the edge of the data eye are
sampled (over sampled) in order to determine if a bit error has occurred
in an alternate embodiment of the present invention. A first counter is
used to count the total number of bits sampled and the second counter is
used to count the number of errors that occurred in the total number of
bits sampled.