Dynamic storage synchronizer using variable oscillator and fifo buffer

Abstract

A method of and apparatus for optimizing the data transfer rate from a dynamic storage subsystem to an asynchronously clocked requestor using a variable rate oscillator and a first-in-first-out or FIFO buffer. On writing data into the dynamic storage subsystem, data is transferred from the requestor to the FIFO buffer and the variable rate oscillator clocks the data from the FIFO buffer into the dynamic storage subsystem at some relatively slow rate. If the FIFO buffer begins to fill, the frequency of the variable rate oscillator increases causing data to be clocked from the FIFO buffer at a higher rate. On reading data from the dynamic storage subsystem, the variable rate oscillator begins at a maximum frequency clocking data into the FIFO buffer from where it is transferred to the requestor. If the FIFO buffer beings to fill up, the frequency of the variable rate oscillator is decreased. Therefore, for both reading and writing, data is always transferred via the FIFO buffer and the frequency of the variable rate oscillator controlling the dynamic storage subsystem is determined by the amount of data stored in the FIFO buffer.