Biomedical Engineering Reference
In-Depth Information
Benign
defect sites
Loading pathway
defect sites
Routing pathway
defect sites
Figure 6.15
The three categories of defects.
defects, these defects affect the loading operations for more than one well
unit. They cannot be bypassed by simply changing the side from which the
well is loaded. Instead, we use a “cross-loading” method for defect tolerance.
Two iterations of well-loading operations are carried out, one in the column
direction and one in the row direction. If the defects occur on the routing
pathways in the well-loading operation in the column direction, the loading
of all the wells within the same column with the defects will be skipped. The
skipped wells will then be loaded in the well-loading operation in the row
direction and vice versa. An example is shown in Figure 6.16. There is a defect
in the routing pathway in the first well unit in the second column. In the
Skipped Column
Defect Site
(a)
(b)
Figure 6.16
Illustration of the “cross-loading” method (a) loading in column direction, (b) loading in row
direction.
