Multi-cast snoop vectors within a mesh topology

A computer program product embodied in a non-transitory computer readable medium for sharing data, the computer program product comprising code which causes one or more processors to generate semiconductor logic for:

• accessing a system-on-a-chip (SOC), wherein the SOC includes a network-on-a-chip (NOC), wherein the NOC includes an M×N mesh topology, wherein M and N are both integers greater than 1, wherein the M×N mesh topology includes a coherent tile at each point of the M×N mesh topology, and wherein each coherent tile in the M×N mesh topology includes one or more local snoop vectors (LSVs);
• initiating, by a first coherent tile within the M×N mesh topology, a snoop operation;
• generating, by the first coherent tile, a snoop vector, wherein the snoop vector indicates one or more other tiles within the M×N mesh topology to be notified of the snoop operation;
• creating, by the first coherent tile, one or more directional snoop vectors (DSVs), wherein the creating includes logically combining the snoop vector that was generated with each of the one or more LSVs;
• selecting an adjacent coherent tile to the first coherent tile, wherein the adjacent coherent tile is located in a cardinal direction from the first coherent tile;
• choosing a first DSV from the one or more DSVs, wherein the choosing is based on the cardinal direction;
• and
• sending, by the first coherent tile, to the adjacent coherent tile that was selected, the snoop operation and the first DSV that was chosen.

A computer system for sharing data comprising:

• a memory which stores instructions;
• one or more processors coupled to the memory wherein the one or more processors, when executing the instructions which are stored, are configured to:
• access a system-on-a-chip (SOC), wherein the SOC includes a network-on-a-chip (NOC), wherein the NOC includes an M×N mesh topology, wherein M and N are both integers greater than 1, wherein the M×N mesh topology includes a coherent tile at each point of the M×N mesh topology, and wherein each coherent tile in the M×N mesh topology includes one or more local snoop vectors (LSVs);
• initiate, by a first coherent tile within the M×N mesh topology, a snoop operation;
• generate, by the first coherent tile, a snoop vector, wherein the snoop vector indicates one or more other tiles within the M×N mesh topology to be notified of the snoop operation;
• create, by the first coherent tile, one or more directional snoop vectors (DSVs), wherein the creating includes logically combining the snoop vector that was generated with each of the one or more LSVs;
• select an adjacent coherent tile to the first coherent tile, wherein the adjacent coherent tile is located in a cardinal direction from the first coherent tile;
• choose a first DSV from the one or more DSVs, wherein the choosing is based on the cardinal direction;
• and
• send, by the first coherent tile, to the adjacent coherent tile that was selected, the snoop operation and the first DSV that was chosen.