Enqueue event first-in, first-out buffer (FIFO)

An apparatus comprising:

• a memory configured to store a plurality of data items, wherein each data item has a type which is one of a plurality of types of data items, and wherein the memory is divided into a plurality of sections, wherein each section corresponds to a respective type of the plurality of types and is configured to store data items of the respective type;
• write control logic coupled to the memory and configured to operate in a write clock domain, wherein the write control logic is configured to maintain a plurality of first read pointers, wherein each of the plurality of first read pointers corresponds to the respective type of the plurality of types and identifies a location in the memory;
• read control logic coupled to the memory and configured to operate in the read clock domain, wherein the read control logic is configured to maintain a plurality of second read pointers, wherein each of the plurality of second write pointers corresponds to the respective type of the plurality of types and identifies a location in the memory;
• a first-in, first-out buffer (FIFO) coupled to the write control logic and the read control logic, wherein the read control logic is configured to pass a read event indicating a read of an input data item from the memory to the write control logic through the FIFO.

A method comprising:

• reading an input data item from a queue in a read clock domain;
• passing a read event from the read clock domain to a write clock domain through a first-in, first-out (FIFO) buffer;
• and
• updating a read pointer corresponding to the input data item in the write clock domain responsive to the read event.