March tests for realistic faults in two-port memories

This paper starts with an overview of realistic faults models for two-port memories, divided into single-port faults and unique two-port faults. The latter faults can not be detected with the conventional single-port memory tests; they require special tests. Thereafter the paper presents a set of four march tests detecting the unique two-port faults. Three of the tests have a time complexity of /spl theta/(n) and one of /spl theta/ (/spl radic/n), whereby n is the size of the two-port memory cell array. Two of the four tests have been implemented at Intel and applied to 1500 two-port memories passing all single port tests. The test results show that two dies fail to pass the implemented tests, which means that the tests are superior.