Abstract:
PROBLEM TO BE SOLVED: To provide a ball grid array (BGA) package that increases the routability of the package substrate and that increases device reliability.SOLUTION: A routing technique for improving device reliability by selectively depopulating solder balls (and their respective solder ball pads 34, vias 32 and traces or lines 30) from a conventional foot print of a ball grid array (BGA) package, and a BGA package so modified. The routing technique uses the gap resulting from the depopulated solder balls as additional space for routing traces or lines from solder ball pads to an exterior surface of a substrate upon which a semiconductor die is mounted. An advantage of the present invention is that it permits the retention of an optimum via diameter while increasing the number of solder balls on the packages that continue shrinking, thereby increasing device reliability.
Abstract:
PROBLEM TO BE SOLVED: To provide a wiring method that improves wiring properties while reducing consumptions of a design time and computer resources.SOLUTION: A wiring path determination method includes steps of: tracing a first wiring forming lattice continuously from an origin to extend additional wiring up to one first selected intersection selected out of a plurality of first intersections; calculating a first via arrangeable region in which an additional via can be arranged on a first wiring layer and a second via arrangeable region in which an additional via can be arranged on a second wiring layer based upon positions of designed wiring and a designed via; arranging the additional via which has the first selected intersection included at any position in a region on a lower surface so that the lower surface is included in the first via arrangeable region and an upper surface is included in the second via arrangeable region; and tracing a second wiring forming lattice continuously from the additional via to extend the additional wiring up to an endpoint.
Abstract:
PROBLEM TO BE SOLVED: To provide a technology capable of miniaturizing a semiconductor device. SOLUTION: In a BGA type semiconductor device with a semiconductor chip flip-chip-bonded onto a wiring substrate, bump electrodes of the semiconductor chip are coupled to lands 8 formed at an upper surface of the wiring substrate. The lands 8 at the upper surface of the wiring substrate are coupled electrically to solder balls formed on a lower surface of the wiring substrate. Therefore, the lands 8 include first type lands 8a with lead-out lines 9 coupled thereto and second type lands 8b with lead-out lines 9 not coupled thereto but with vias formed just thereunder. The lands 8 are arrayed in six or more rows at equal pitches in an advancing direction of the rows. However, a row-to-row pitch is not made an equal pitch. In land rows which are likely to cause a short-circuit, the pitch between adjacent rows is made large, while in land rows which are difficult to cause a short-circuit, the pitch between adjacent rows is made small. By so doing, both prevention of a short-circuit and improvement of the layout density of lands 8 are attained at a time. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a multilayer wiring board for preventing a load from being applied to design by efficiently drawing out a wiring pattern from a pad arrangement region. SOLUTION: In the multilayer wiring board 30, the pad arrangement region, where a connection pad 12 to which a semiconductor element is flip-chip connected is disposed in a square grid shape, is provided on a substrate, and the multilayer wiring board 30 has a wiring pattern, where the other end is drawn out of the connection pad 12 to the outside of the pad arrangement region. A pad non-arrangement region is periodically provided along the outer periphery of the pad arrangement region. When the pitch of the connection pad 12, a connection pad diameter, the minimum spacing between the wiring patterns and that between the wiring pattern and the connection pad 12, the minimum wiring width of the wiring pattern, and the number of columns and the number of rows where the pad 12 is not disposed in the pad non-arrangement region are set to P, d, s, w, Ndl, and Ndr, respectively, the connection pad 12 and the wiring patterns are disposed in the arrangement meeting a formula of ((Ndl+1)P-d-s)/(w+s)≥2Ndr+Ndl. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To restrain crosstalk noise among the signals having the relation in which one signal becomes a synchronous signal of the other signal. SOLUTION: A wiring board (2) has a plurality of wiring layers (L1 to L4). On one surface, a plurality of chip connection electrodes (5) to be connected with the semiconductor chip (3) are provided, while on the other surface, a plurality of external connection electrodes (6) of the semiconductor device are provided. For coupling of connection electrodes and external connection electrodes corresponding with each other, wires formed on the wiring layer and via (7) for connecting wires between the wiring layers are provided. A plurality of chip connection electrodes include a first chip connection electrode for a first signal which is varied in its logical value, and a second chip connection electrode for a second signal which is varied after the variation timing of the first signal. A wiring layer mainly for wiring of the route from the first chip connection electrode up to a first external connection electrode corresponding thereto is formed, resulting in difference from the wiring layer mainly for wiring of the route from the second chip connection electrode provided adjacent to the first chip connection electrode up to a second external connection electrode corresponding thereto. COPYRIGHT: (C)2006,JPO&NCIPI