Via stack fault detection
First Claim
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1. An apparatus for fault detection in a via stack, the apparatus comprising:
- a plurality of dies coupled together through the via stack, each die having a reference voltage selection circuit coupled to a respective via, each die further having a circuit configured to select its respective die and enable the reference voltage selection circuit to couple a reference voltage to the respective via; and
a connection to the via stack configured to apply a supply voltage to the via stack and measure a resulting current through the via stack.
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Abstract
A method and apparatus are disclosed. One such method includes selecting a die of a plurality of dies that are coupled together through a via stack. A via on the selected die can be coupled to ground. A supply voltage is coupled to an end of the via stack and a resulting current measured. A calculated resistance is compared to an expected resistance to determine if a fault exists in the via stack.
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Citations
25 Claims
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1. An apparatus for fault detection in a via stack, the apparatus comprising:
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a plurality of dies coupled together through the via stack, each die having a reference voltage selection circuit coupled to a respective via, each die further having a circuit configured to select its respective die and enable the reference voltage selection circuit to couple a reference voltage to the respective via; and a connection to the via stack configured to apply a supply voltage to the via stack and measure a resulting current through the via stack. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for via stack fault detection, the apparatus comprising:
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a plurality of dies; a plurality of die-to-die interconnects, each die-to-die interconnect coupling a pair of adjacent dies of the plurality of dies; a respective die via, on each of the plurality of dies, wherein the respective die via is switchably coupled to ground, each respective die via coupled to adjacent die vias through adjacent die-to-die interconnects to form the via stack; a supply voltage connection switchably coupled to one end of the via stack and configured to apply a supply voltage to the via stack; a connection to the via stack configured to measure a resulting current through the via stack. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for fault detection of a via stack, the method comprising:
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selecting a die of a plurality of dies; coupling a via of the selected die to circuit ground to create one end of the via stack; applying a supply voltage to an opposite end of the via stack; and measuring a resulting current on the via stack. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification