FIFO device and method of storing data in FIFO buffer

A FIFO (First-In First-Out) device that holds a transfer request transferred from a first bus and including a write address, a data size, and write data, and outputs the transfer request to a second bus, the FIFO device comprising:

• at least one transfer request generation unit that, upon reception of a first transfer request and a second transfer request subsequent to the first transfer request from the first bus, makes a determination whether the first transfer request and the second transfer request can be combined together, based on a write address and a data size of the first transfer request and a write address and a data size of the second transfer request, and when determining that the first transfer address and the second transfer address can be combined together, replaces a combined transfer request obtained by combining the first transfer request and the second transfer request together, with the first transfer request to be held and output;
• and
• a FIFO buffer that holds the transfer request output from the transfer request generation unit, and transfers the transfer request to the second bus.