Retimers to extend a die-to-die interconnect

A method comprising:

• receiving a flit at a first retimer on a first package, wherein the flit is received from a die on the first package via a first link, the first link is implemented using a first technology and comprises a set of sideband lanes and a separate set of mainband lanes;
• preparing data of the flit to be transmitted over a second link to a second retimer on a second package, wherein the second link is implemented using a different, second technology;
• and
• sending the data of the flit from the first retimer to the second retimer on the second link.

A system comprising:

• a first device package comprising:
• a first die;
• and
• a first retimer comprising:
• a first port to couple to the first die over a first die-to-die link, wherein the first die-to-die link comprises a defined set of lanes and utilizes a first communication technology;
• and
• a second port to couple to a second retimer over an off-package interconnect, wherein the off-package interconnect utilizes a different second communication technology, and the second retimer is located on a different, second device package.