Streaming protocol flow control for die-to-die interfaces

A method of die-to-die (D2D) credit-based flow control, the method comprising:

• receiving, at a destination from a source, a first return credit in a header flit of a first packet;
• incrementing, at the destination, a credit count based on receiving the first return credit from the source;
• allowing, at the destination, a second packet to be transmitted to the source based on the credit count;
• and
• decrementing, at the destination, the credit count based on transmitting a flit of the second packet to the source,
• wherein the first return credit is received in a header flit of a second packet transmitted from the destination to the source.

A non-transitory computer-readable medium storing code that comprises instructions executable by a processor of a die-to-die (D2D) credit-based flow control device to:

• allow, at a source, a first packet to be transmitted from the source to a destination based on a credit count;
• decrement, at the source, the credit count based on transmitting a flit of the first packet to the destination;
• and
• increment, at the source, the credit count based on receiving a first return credit from the destination,
• wherein the first return credit is received in a header flit of a second packet transmitted from the destination to the source.