Multi-die interconnect

1. An apparatus comprising a multi-die interconnect comprising:

a bridge die having a first plurality of interconnects and a second plurality of interconnects;

a first die having a first plurality of contacts and a second plurality of contacts, wherein the second plurality of contacts of the first die is coupled to the first plurality of interconnects of the bridge die and wherein the second plurality of contacts of the first die both have a smaller height than the first plurality of contacts of the first die;

a second die having a first plurality of contacts and a second plurality of contacts, wherein the second plurality of contacts of the second die is coupled to the second plurality of interconnects of the bridge die and wherein the second plurality of contacts of the second die both have a smaller height than the first plurality of contacts of the second die;

a first underfill, wherein the first plurality of interconnects and the second plurality of interconnects of the bridge die are embedded in the first underfill; and

a second underfill, wherein the first plurality of contacts of the first die and the first plurality of contacts of the second die are embedded in the second underfill.

2. The apparatus of claim 1 , wherein the first die and second die are embedded in a mold compound.

3. The apparatus of claim 1 , wherein the first plurality of interconnects and second plurality of interconnects of the bridge die have a smaller pitch than the first plurality of contacts of the first die and the first plurality of contacts of the second die.

4. The apparatus of claim 3 , wherein the first plurality of interconnects and second plurality of interconnects of the bridge die are configured as die bumps with a pitch in a range of 40 μm to 55 μm.

5. The apparatus of claim 4 , wherein the second plurality of contacts of the first die are pads and the second plurality of contacts of the second die are pads.

6. The apparatus of claim 1 , further comprising:

a package substrate having a cavity and a plurality of pads,

wherein the bridge die is disposed at least partially in the cavity, and

wherein the plurality of pads is coupled to the first plurality of contacts of the first die and the first plurality of contacts of the second die.

7. The apparatus of claim 6 , further comprising:

a plurality of connectors external to the package substrate, wherein a least one of the plurality of pads is.

8. The apparatus of claim 1 , wherein a combined height of the first plurality of interconnects of the bridge die and the second plurality of contacts of the first die is smaller than a height the first plurality of contacts of the first die.

9. The apparatus of claim 1 , wherein a combined height of the second plurality of interconnects of the bridge die and the second plurality of contacts of the second die is smaller than a height of the first plurality of contacts of the second die.

10. The apparatus of claim 1 , wherein the apparatus is selected from the group consisting of a music player, a video player, an entertainment unit, a navigation device, a communications device, a mobile device, a mobile phone, a smartphone, a personal digital assistant, an access point, a fixed location terminal, a tablet computer, a computer, a wearable device, an Internet of things (IoT) device, a laptop computer, a server, a base station, and a device in an automotive vehicle.

11. The apparatus of claim 1 , wherein a back side of the bridge die opposite the first plurality of interconnects and the second plurality of interconnects has no interconnects.

12. The apparatus of claim 11 , further comprising:

a package substrate having a cavity, wherein the bridge die is disposed at least partially in the cavity and is attached to the cavity by an adhesive on the back side of the bridge die.

13. A method for fabricating an apparatus having a multi-die interconnect, the method comprising:

providing a bridge die having a first plurality of interconnects and a second plurality of interconnects;

coupling a first die having a first plurality of contacts and a second plurality of contacts to the first plurality of interconnects of the bridge die using the second plurality of contacts of the first die, wherein the second plurality of contacts of the first die and first plurality of interconnects have both a smaller height than the first plurality of contacts of the first die;

coupling a second die having a first plurality of contacts and a second plurality of contacts to the second plurality of interconnects of the bridge die using the second plurality of contacts of the second die, wherein the second plurality of contacts of the second die and the second plurality of interconnects have both a smaller height than the first plurality of contacts of the second die;

embedding the first plurality of interconnects and the second plurality of interconnects of the bridge die in a first underfill; and

embedding the first plurality of contacts of the first die and the first plurality of contacts of the second die in a second underfill.

14. The method of claim 13 , further comprising:

embedding the first die and second die in a mold compound.

15. The method of claim 13 , wherein the first plurality of interconnects and second plurality of interconnects of the bridge die have a smaller pitch than the first plurality of contacts of the first die and the first plurality of contacts of the second die.

16. The method of claim 15 , wherein the first plurality of interconnects and second plurality of interconnects of the bridge die are configured as die bumps with a pitch in a range of 40 μm to 55 μm.

17. The method of claim 16 , wherein the second plurality of contacts of the first die are pads and the second plurality of contacts of the second die are pads.

18. The method of claim 13 , further comprising:

providing a package substrate having a cavity and a plurality of pads,

embedding the bridge die at least partially in the cavity, and

coupling the plurality of pads to the first plurality of contacts of the first die and the first plurality of contacts of the second die.

19. The method of claim 18 , further comprising:

forming a plurality of connectors on an opposite side of the package substrate to the plurality of pads.

20. The method of claim 13 , wherein the first plurality of interconnects of the bridge die has a smaller height than the first plurality of contacts of the first die.

21. The method of claim 13 , wherein the coupled second plurality of contacts of the first die and first plurality of interconnects of the bridge die have a smaller height than the first plurality of contacts of the first die, and the coupled second plurality of contacts of the second die and the second plurality of interconnects the bridge die have a smaller height than the first plurality of contacts of the second die.

22. The method of claim 13 , wherein the apparatus is selected from the group consisting of a music player, a video player, an entertainment unit, a navigation device, a communications device, a mobile device, a mobile phone, a smartphone, a personal digital assistant, an access point, a fixed location terminal, a tablet computer, a computer, a wearable device, an Internet of things (IoT) device, a laptop computer, a server, a base station, and a device in an automotive vehicle.

23. The method of claim 13 , wherein a back side of the bridge die opposite the first plurality of interconnects and the second plurality of interconnects has no interconnects.

24. The method of claim 23 , further comprising:

attaching, using an adhesive, the back side of the bridge die to a cavity in a package substrate, wherein the bridge die is disposed at least partially in the cavity.