Twistor buffer store

DIGITAL STORES are often used to connect a source and a sink of data which have unequal instantaneous data rates. Such a store is usually called a buger. This paper describes a transistor driven twistor buffer store with a capacity of 30 words of 22 bits each. Access to the store is sequential; Le., the first word written in is the first word read out. Although the store operation is synchronous in that the 4-microsecond read-write cycle is controlled by a clock, writing and reading are independent, i.e., the data source may or may not present a new word to be written into the store during the 2-microsecond write interval and the data sink may or may not read out a word during the read interval. The organization of the buffer is shown in the block diagram of Figure 1. Because of the independence of writing and reading, separate sequential access switches are provided for reading and for writing.