Patent ID: 7015068

Claim:
A method of processing a partial wafers that does not have a reference die comprising the steps of: making all partial wafer cuts perpendicular to the wafer flat with all partial wafer cuts following a cut sequence where the first cut section is with a reference die and the other cut sections are in the numerical order from right to left with the first partial wafer of the full wafer having the reference die; providing wafer map data and last left column coordinate (LCOLUMN) of a previous partial wafer to the partial wafer to be processed to pick and place equipment; using said last left column coordinate (LCOLUMN) removing all dies from wafer map data that have a column coordinate number equal to and less than said LCOLUMN and therefore are not part of this partial wafer; identifying a pseudo reference die for each partial wafer not having a reference die which die is the first die in the bottom right after removing all dies in the right side of the partial wafer using said last left column (LCOLUMN) information and where the partial wafer does not have to contain at least one full die in the reference die row and the wafer table does not have to be moved to verify the pseudo reference die and does not require uploading of die coordinates to host from a processing using the reference die; moving wafer table to the last left column of the partial wafer and determining the coordinate; storing the coordinate of the last left column in a wafer map data file; removing all dies from the wafer map that are to the left of the last left column of the partial wafer and not part of the partial wafer using said coordinate; and performing picking and placing dies.