Data buffer memory of the first-in, first-out type, having a variable input and a fixed output

Claim 1

A data buffer memory of the first-in, first-out type, having logic means for ensuring that an input for data to be written is situated substantially as near as possible to an output for data to be read depending on the filling of the buffer, thus providing an uninterrupted content of the buffer, said buffer having a plurality of registers, each register having at least one section, furthermore having an input bus for supplying data to an input of a register of said buffer assigned for this purpose, and an output connected to the last register of the buffer on which data to be read appear, said data buffer comprising: logic means provided for each section of said buffer; said logic means being at least functionally separate from said sections of said buffer except for connections; said logic means being of the type enabling signals to be generated for a buffer having n registers (O, . . . n-1): first logic means for detecting a condition that a register (i) is empty and that the next register (i+1) is full, plus determining where from the series of empty registers, the empty register adjoins a subsequent filled register; second logic means for generating a shift signal for shifting the data in said buffer in the direction of the output register, indicating the status full of a preceding register and indicating the status empty of the relevant register (i); third logic means for generating a status signal for the filling of a register (i) as the result of data entering said register; said third logic means also serving to generate a status signal for the last register in said buffer when data is read from said last register.