METHOD FOR INCREASING MAXIMUM NUMBER OF PORTS IN AN I/O MACRO
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-16
Using a grid router to route a gate array requires that all macro ports (connection points) fall on a grid point. In the case of l/O macros on the periphery of the array (fig. 1) this requires that the ports fall on a common multiple of the x and y grid increments. For Mosaic III the horizontal pitch is 6.0 urn and the vertical pitch is 4.5 urn. (fig. 2). This requires the ports to be on an 18 urn pitch.