GB1123284A - Improvements in or relating to buffer registers - Google Patents

Abstract

1,123,284. Buffer register. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 12 Jan., 1967 [15 Jan., 1966], No. 1752/67. Heading G4C. A buffer register composed of a shift register Shaving a plurality of sections S 1 -S 5 , each of which stores a word, connected in cascade, wherein shift pulses PB are applied to each section via appropriate AND gates A 1 -A 5 is characterized by a cascade arrangement of OR gates B 1 -B 4 ,each of which is associated with a section and receives a signal indicating whether the appropriate section is empty or not, and the output of which is applied to the appropriate AND gate so that each AND gate circuit of a section preceding at least one empty section passes the shift pulses. Data from a source B can be read in to the buffer register at a variable rate and read out to source V whenever a binary element VI is set. Each section of the register S is associated with a binary element S1n-S5n which indicates whether the appropriate section is empty or not, the indications being shifted when data is shifted in the buffer register. A series of OR gates has one input connected to the appropriate binary element and one input to the output of the next preceding OR gate except gate B4 which has one input connected to binary element VI. If any section contains no data or if output is required by user V the first OR gate connected to the appropriate binary element passes a signal to enable the AND gate of the preceding section to cause data to be shifted and also causes all succeeding OR gates to pass signals causing all previous sections to shift data.