Link initialization training and bring up for die-to-die interconnect

Abstract

In one embodiment, an apparatus includes: a die-to-die adapter to communicate with a protocol layer and physical layer circuitry, and the physical layer circuitry coupled to the die-to-die adapter, where the physical layer circuitry is to receive and output first information to a second die via an interconnect. The physical layer circuitry, after a reset flow for the first die, is to: perform a sideband initialization of a sideband interface of the interconnect to detect that the second die has completed a reset flow for the second die; and after the sideband initialization, perform a mainband initialization of a mainband interface of the interconnect at a lowest speed, and thereafter perform a mainband training of the mainband interface at a negotiated data rate. Other embodiments are described and claimed.