Distributed credit FIFO link of a configurable mesh data bus

An integrated circuit comprising:

• a first distributed credit First-In-First-Out (FIFO) structure that communicates information from a center part of a first rectangular island, through an output port of the first island, through an input port of a second rectangular island, to a center part of the second island, wherein the first distributed credit FIFO structure comprises:
• a first FIFO associated with the output port of the first island;
• a first chain of registers;
• a second FIFO associated with the input port of the second island, wherein a data signal path extends from the first FIFO in the first island, through the first chain of registers, and to the second FIFO in the second island;
• a second chain of registers;
• and
• a credit count circuit disposed in the first island, wherein a taken signal path extends from the center part of the second island, through the second chain of registers, and to the credit count circuit in the first island, and wherein the credit count circuit determines a credit value of the first distributed credit FIFO structure.