Dynamically reconfigured redundant lanes in a communication interface circuit between chiplets to increase redundancy when the probability of failure favors a particular communication direction

A method of communicating between two chiplets in an integrated circuit (IC) package, comprising:

• coupling a first chiplet to a second chiplet through a communication interface circuit,
• the communication interface circuit comprising:
• a plurality of main lanes comprising a first subset of the plurality of main lanes allocated to communicate information in a first direction and a second subset of the plurality of main lanes allocated to communicate information in a second direction;
• and
• a plurality of redundant lanes, each of the plurality of redundant lanes dynamically reconfigurable to communicate in one of the first direction and the second direction;
• determining a failure in a first one of the plurality of main lanes allocated to communicate in the first direction;
• and
• in response to the failure in the first one of the plurality of main lanes allocated to communicate in the first direction,
• reconfiguring a first one of the plurality of redundant lanes to communicate data intended for the first one of the plurality of main lanes in the first direction.

An integrated circuit (IC) package, comprising:

• a communication interface circuit;
• a first chiplet;
• and
• a second chiplet coupled to the first chiplet through the communication interface circuit,
• the communication interface circuit comprising:
• a plurality of main lanes comprising a first subset of the plurality of main lanes allocated to communicate information in a first direction and a second subset of the plurality of main lanes allocated to communicate information in a second direction;
• and
• a plurality of redundant lanes, each of the plurality of redundant lanes dynamically reconfigurable to communicate in one of the first direction and the second direction, the plurality of redundant lanes is a fixed number;
• the communication interface circuit configured to:
• determine a first number of lane failures in the plurality of main lanes allocated to communicate in the first direction;
• determine a second number of lane failures in the plurality of main lanes allocated to communicate in the second direction;
• wherein the fixed number of the plurality of redundant lanes equals the first number of lane failures added to the second number of lane failures;
• in response to the first number of lane failures in the plurality of main lanes allocated to communicate in the first direction, the communication interface circuit is further configured to reconfigure a first portion of the plurality of redundant lanes to communicate data in the first direction, wherein the first portion of the plurality of redundant lanes equals the first number of lane failures in the plurality of main lanes;
• and
• in response to the second number of lane failures in the plurality of main lanes allocated to communicate in the second direction, the communication interface circuit is further configured to reconfigure a second portion of the plurality of redundant lanes to communicate data in the second direction, wherein the second portion of the plurality of redundant lanes equals the second number of lane failures in the plurality of main lanes.