Device and method of very high density routing used with embedded multi-die interconnect bridge

A semiconductor device, comprising:

• a first metal layer;
• a first dielectric material layer above the first metal layer;
• a second metal layer above the first dielectric material layer;
• a second dielectric material layer above the second metal layer;
• a bridge die above the second dielectric material layer;
• first and second conductive pillars adjacent to a first side of the bridge die;
• third and fourth conductive pillars adjacent to a second side of the bridge die, the second side laterally opposite to the first side;
• a first insulating layer above the second dielectric material layer, the first insulating layer laterally between the first and second conductive pillars, laterally between the second conductive pillar and the bridge die, laterally between the bridge die and the third conductive pillar, and laterally between the third and fourth conductive pillars;
• a second insulating layer over the first insulating layer, over and in direct contact with an uppermost surface of the first conductive pillar, over and in direct contact with an uppermost surface of the second conductive pillar, over and in direct contact with an uppermost surface of the third conductive pillar, and over and in direct contact with an uppermost surface of the fourth conductive pillar, and over the bridge die, the second insulating layer having a bottommost surface;
• vias in the second insulating layer, the vias coupled to the first, second, third and fourth conductive pillars to the bridge die, wherein the vias have a bottommost surface at a same level as the bottommost surface of the second insulating layer;
• a first die electrically coupled to the bridge die and to the first and second conductive pillars;
• a second die electrically coupled to the bridge die and to the third and fourth conductive pillars;
• and
• a third insulating layer over the second insulating layer, the third insulating layer intervening between the second insulating layer and the first die.

A method of fabricating a semiconductor device, the method comprising:

• forming alternating layers of dielectric material and metal;
• providing a bridge die above the alternating layers of dielectric material and metal;
• forming a plurality of conductive pillars adjacent to sides of the bridge die;
• forming a first insulating layer above the alternating layers of dielectric material and metal, the first insulating layer laterally between the plurality of conductive pillars and the bridge die;
• forming a second insulating layer over the first insulating layer, over and in direct contact with an uppermost surface of the plurality of conductive pillars, and over the bridge die, the second insulating layer having a bottommost surface;
• forming a plurality of vias in the second insulating layer, the plurality of vias coupled to the plurality of conductive pillars and to the bridge die, wherein the plurality of vias have a bottommost surface at a same level as the bottommost surface of the second insulating layer;
• coupling a first die to the bridge die and to the plurality of conductive pillars;
• coupling a second die to the bridge die and to the plurality of conductive pillars;
• and
• forming a third insulating layer over the second insulating layer, the third insulating layer intervening between the second insulating layer and the first die.