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You can check the "Component Author Guide", Page 56. (PSoC Creator -> Help -> Documentation -> Component Author Guide).
It says, "
Single buffer mode –This mode configures the FIFO to be a 1-word deep buffer instead of the normal 4-word deep FIFO. Any value written to the FIFO immediately overwrites its content. This mode can be used if only a 1-register FIFO with its corresponding FIFO bus and block status signals are needed"
Sorry, its page 46