Selective solder bump application
View Patent ↗Selective application of solder bumps in an integrated circuit package. Solder bumps are selectively applied in a solder bump integrated circuit packaging process so that portions of a circuit can be effectively disabled. The bumps may be selectively applied either to a die or to the substrate using multiple solder masks, one for each pattern of solder bumps desired or can be otherwise applied in multiple patterns depending upon which portions of the circuitry are to be active and which are to be disabled.
1. An integrated circuit device, comprising:
an integrated circuit die having a plurality of solder pads used for conveying signals to and from the die, the integrated circuit having a plurality of blocks of circuitry;
a substrate having a plurality of solder pads corresponding to at least a portion of the integrated circuit die's solder pads;
a plurality of solder bumps connecting the substrate to the integrated circuit die;
wherein at least one of the blocks of circuitry can be selectively configured by selectively making an electrical connection between the substrate and the integrated circuit die, the block of circuitry to be selectively configured having at least one solder pad that is used to selectively connect to the block of circuitry in order to configure the block of circuitry; and
wherein the at least one of the blocks of circuitry is selectively configured by omission of a solder bump on the substrate for at least one connection between the substrate and the at least one of the blocks of circuitry.
2. The apparatus according to claim 1 , wherein the one of the plurality of blocks of circuitry is disabled by omission of a solder bump that supplies power supply voltage to the at least one of the block of circuitry.
3. The apparatus according to claim 2 , wherein the block of circuitry that is disabled is identified by testing the plurality of blocks of circuitry for functionality.
4. The apparatus according to claim 2 , wherein the block of circuitry that is disabled is determined to not be functional by said testing.
5. The apparatus according to claim 2 , wherein the block of circuitry that is disabled comprises one of a plurality of microprocessor cores.
6. The apparatus according to claim 2 , wherein the block of circuitry that is disabled comprises at least one of a plurality of memory blocks.
7. The apparatus according to claim 2 , wherein the block of circuitry that is disabled comprises one of a plurality of redundant blocks of circuitry.
8. The apparatus according to claim 2 , wherein one of the plurality of solder bumps connects the substrate to a ground node in the block of circuitry that is disabled.
9. The apparatus according to claim 1 , wherein the omitted solder bump, if present, would connect the substrate to a logic input forming a part of the block of circuitry.
10. The apparatus according to claim 1 , wherein the substrate forms part of a chip carrier.
11. The apparatus according to claim 1 , wherein the one of the plurality of blocks of circuitry is configured by selective connection of a signal to a logic gate.