Interconnecting dies by stitch routing

1. A stitched die structure including:

a semiconductor substrate including a first die area of a first die and a second die area of a second die separate from the first die area, wherein the first die area includes a first core logic circuit region and a first die-to-die input/output circuit region, and the second die area includes a second core logic circuit region and a second die-to-die input/output circuit region; and

a back-end-of-the-line (BEOL) build-up structure spanning over the first die area and the second die area, the BEOL build-up structure comprising a die-to-die routing to electrically connect the first die-to die input/output circuit region to the second die-to-die input/output circuit region;

wherein the die-to-die routing includes a first die routing, a second die routing, and a stitch routing physically connecting the first die routing to the second die routing.

2. The stitched die structure of claim 1 , wherein the stitch routing has a wider line width than the first die routing and the second die routing, and the stitch routing has a coarser line pitch than the first die routing and the second die routing.

3. The stitched die structure of claim 1 , wherein the first die-to-die input/output circuit region in includes a driver, and the second die-to-die input/output circuit region includes a receiver.

4. The stitched die structure of claim 3 , wherein the second die-to-die input/output circuit region comprises an antenna diode coupled to the second die-to-die routing between the receiver and the stitch routing.

5. The stitched die structure of claim 4 , wherein the first die-to-die input/output circuit region comprises a second antenna diode coupled to the first die-to-die routing between the driver and the stitch routing.

6. The stitched die structure of claim 4 , further comprising a detection circuit coupled to the receiver and a second die-to-die routing to detect presence of the first die.

7. The stitched die structure of claim 3 , further comprising a buffer enable/disable input to the driver, a first power switch input to the driver, an enable/disable input to the receiver, and a second power switch input to the receiver.

8. The stitched die structure of claim 3 , wherein the first core logic circuit region and the first die-to-die input/output circuit region are laterally separated by a first keep out zone, and the second core logic circuit region and the second die-to-die input/output circuit region are laterally separated by a second keep out zone.

9. The stitched die structure of claim 3 , wherein the BEOL build-up structure further comprises:

a first metallic seal directly over a first peripheral area of the first die area;

a second metallic seal directly over a second peripheral area of the second die area; and

the die-to-die routing extends through a first opening in the first metallic seal and a second opening in the second metallic seal to electrically connect the first die to the second die.

10. The stitched die structure of claim 9 , wherein the die-to-die routing enters the first metallic seal in a lower metal level in the BEOL build-up structure and exits the first metallic seal in an upper metal level in the BEOL build-up structure above the lower metal level.

11. The stitched die structure of claim 9 , wherein the first die area includes a third die-to-die input/output circuit region including a second receiver opposite the first core logic circuit region from the first die-to-die input/output circuit region, and the receiver is coupled with a third die routing that terminates near a diced edge of the stitched die structure.

12. The stitched die structure of claim 9 , further comprising one or more barrier layers including a substantially uniform thickness spanning along the diced edge of the stitched die structure substantially orthogonal to metal layers of the BEOL build-up structure.

13. The stitched die structure of claim 3 , further comprising a metallic seal around the first die area, the second die area, and the die-to-die routing.

14. A stitched die structure including:

a semiconductor substrate including a first die first die area of a first die and a second die area of a second die separate from the first die area;

a back-end-of-the-line (BEOL) build-up structure spanning over the first die area and the second die area, the BEOL build-up structure comprising:

a die-to-die routing electrically connecting the first die to the second die;

a metallic seal around the first die area, the second die area and the die-to die routing;

wherein the die-to-die routing includes a first die routing within the first die area, a second die routing within the second die area, and a stitch routing physically connecting the first die routing to the second die routing.

15. The stitched die structure of claim 14 , wherein the stitch routing has a wider line width than the first die routing and the second die routing, and the stitch routing has a coarser line pitch than the first die routing and the second die routing.

16. The stitched die structure of claim 14 , wherein the first die area includes a first core logic circuit region and a first die-to-die input/output circuit region, and the second die includes a second core logic circuit region and a second die-to-die input/output circuit region, and the die-to-die routing electrically connects the first die-to-die input/output circuit region to the second die-to-die input/output circuit region.

17. A stitched die structure including:

a semiconductor substrate including a first die first die area of a first die and a second die area of a second die separate from the first die area;

a back-end-of-the-line (BEOL) build-up structure spanning over the first die area and the second die area, the BEOL build-up structure comprising:

a die-to-die routing electrically connecting the first die to the second die;

a metallic seal around the first die area, the second die area and the die-to die routing;

a plurality of input/output circuits and a plurality of die input/output connections coupled to the plurality of input/output circuits with a plurality of stitch routings; and

an input/output circuit is not coupled to a die input/output connection of the die-to-die routing in the plurality of input/output circuits.

18. The stitched die structure of claim 17 , comprising a first group of the plurality of routings with a first characteristic routing pattern, and a second group of the plurality of routings with a second characteristic routing pattern, wherein a difference in the first characteristic routing pattern and the second characteristic routing pattern is correlated with the input/output circuit not being coupled to the die input/output connection.

19. A module comprising:

a module substrate;

a stitched die structure mounted on the module substrate, the stitched die structure including a first die area of a first die and a second die area of a second die, and a back-end-of-the-line (BEOL) build-up structure that spans over the first die area and the second die area and electrically connects the first die to the second die;

wherein the BEOL build-up structure comprises a die-to-die routing to electrically connect the first die-to die input/output circuit region to the second die-to-die input/output circuit region, the die-to-die routing including a first die routing, a second die routing, and a stitch routing physically connecting the first die routing to the second die routing; and

a hermetic seal surrounding the stitched die structure.

20. The module of claim 19 , wherein the stitched die structure further comprises:

a first metallic seal directly over a first peripheral area of the first die area;

a second metallic seal directly over a second peripheral area of the second die area; and

wherein the die-to-die routing extends through a first opening in the first metallic seal and a second opening in the second metallic seal to electrically connect the first die to the second die:

wherein the first die area includes a first core logic circuit region and a first die-to-die input/output circuit region, and the second die includes a second core logic circuit region and a second die-to-die input/output circuit region, and the BEOL electrically connects the first die-to-die input/output circuit region to the second die-to-die input/output circuit region.

21. The module of claim 19 , wherein the stitched die structure further comprises:

a metallic seal around the first die area, the second die area and the die-to die routing.