METHOD OF RETRIEVING FRAME SYNCHRONIZATION OF NONNDESTRUCTIVE DYNAMIC MEMORY

摘要

A method and apparatus for the recovery of loop frame synchronization in a magnetic bubble domain memory are disclosed. One loop of the memory is used to store the parity of corresponding bits for the other loops. A special sequence of even/odd parity pattern with a peaked autocorrelation function is inserted at the end or start of the loop frame in place of the normal even or odd parity in the parity loop. The special sequence of even/odd parity pattern is detected by a pattern recognizer to re-establish loop frame synchronization.