Merging of Different Chips Onto a Single Chip
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
A method is described which allows the merging of several chips onto the same chip without having to regenerate the test data or change the logic. This method will allow the use of the original test data generated for the original chips. It also will allow the logic for the two chips to be merged onto a single chip without changing their logic. In order to use the original test data, a tester must be able to observe and apply stimulus to the original primary inputs and outputs of each chip. Fig. 1 shows the interface that occurs on signals in which both chips A and B drive. In this case, a latch with a tristateable output must be fed and must feed the signal driven by both A and B. The latch must also have a scan port that will allow a tester to scan data in whenever the tester wants to drive the signal.